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class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Containers"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Containers</span> </div> </a> <ul id="toc-Containers-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bandwidth_and_sampling_rate" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bandwidth_and_sampling_rate"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Bandwidth and sampling rate</span> </div> </a> <ul id="toc-Bandwidth_and_sampling_rate-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-History" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#History"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>History</span> </div> </a> <button aria-controls="toc-History-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle History subsection</span> </button> <ul id="toc-History-sublist" class="vector-toc-list"> <li id="toc-Finalization_(1.0)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Finalization_(1.0)"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Finalization (1.0)</span> </div> </a> <ul id="toc-Finalization_(1.0)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-1.1" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#1.1"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>1.1</span> </div> </a> <ul id="toc-1.1-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-1.2" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#1.2"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>1.2</span> </div> </a> <ul id="toc-1.2-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-1.3" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#1.3"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>1.3</span> </div> </a> <ul id="toc-1.3-sublist" class="vector-toc-list"> <li id="toc-1.3.1" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#1.3.1"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4.1</span> <span>1.3.1</span> </div> </a> <ul id="toc-1.3.1-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-1.4" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#1.4"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.5</span> <span>1.4</span> </div> </a> <ul id="toc-1.4-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-1.5" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#1.5"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.6</span> <span>1.5</span> </div> </a> <ul id="toc-1.5-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Current_development" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Current_development"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.7</span> <span>Current development</span> </div> </a> <ul id="toc-Current_development-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Quality_comparison_and_low-latency_performance" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Quality_comparison_and_low-latency_performance"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Quality comparison and low-latency performance</span> </div> </a> <ul id="toc-Quality_comparison_and_low-latency_performance-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Support" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Support"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Support</span> </div> </a> <button aria-controls="toc-Support-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Support subsection</span> </button> <ul id="toc-Support-sublist" class="vector-toc-list"> <li id="toc-Implementations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Implementations"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Implementations</span> </div> </a> <ul id="toc-Implementations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Software_and_content_providers" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Software_and_content_providers"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Software and content providers</span> </div> </a> <ul id="toc-Software_and_content_providers-sublist" class="vector-toc-list"> <li id="toc-Operating_system_support" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Operating_system_support"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.1</span> <span>Operating system support</span> </div> </a> <ul id="toc-Operating_system_support-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Media_player_support" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Media_player_support"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.2</span> <span>Media player support</span> </div> </a> <ul id="toc-Media_player_support-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Browser_support" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Browser_support"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.3</span> <span>Browser support</span> </div> </a> <ul id="toc-Browser_support-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-VoIP_support" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#VoIP_support"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.4</span> <span>VoIP support</span> </div> </a> <ul id="toc-VoIP_support-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Hardware" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Hardware"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Hardware</span> </div> </a> <ul id="toc-Hardware-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Patent_claims" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Patent_claims"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Patent claims</span> </div> </a> <ul id="toc-Patent_claims-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Notes"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Notes</span> </div> </a> <ul id="toc-Notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <button aria-controls="toc-References-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle References subsection</span> </button> <ul id="toc-References-sublist" class="vector-toc-list"> <li id="toc-Citations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Citations"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Citations</span> </div> </a> <ul id="toc-Citations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sources" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sources"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.2</span> <span>Sources</span> </div> </a> <ul id="toc-Sources-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span 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Available in 25 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-25" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">25 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A3%D9%88%D8%A8%D9%88%D8%B3" title="أوبوس – Arabic" lang="ar" hreflang="ar" data-title="أوبوس" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Opus_(%C3%A0udio)" title="Opus (àudio) – Catalan" lang="ca" hreflang="ca" data-title="Opus (àudio)" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Opus_(kompresn%C3%AD_form%C3%A1t)" title="Opus (kompresní formát) – Czech" lang="cs" hreflang="cs" data-title="Opus (kompresní formát)" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Opus_(lydformat)" title="Opus (lydformat) – Danish" lang="da" hreflang="da" data-title="Opus (lydformat)" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Opus_(Audioformat)" title="Opus (Audioformat) – German" lang="de" hreflang="de" data-title="Opus (Audioformat)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Opus_(c%C3%B3dec)" title="Opus (códec) – Spanish" lang="es" hreflang="es" data-title="Opus (códec)" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Opus_(audio_kodeka)" title="Opus (audio kodeka) – Basque" lang="eu" hreflang="eu" data-title="Opus (audio kodeka)" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D9%BE%D8%A7%D8%B3" title="اپاس – Persian" lang="fa" hreflang="fa" data-title="اپاس" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Opus_Interactive_Audio_Codec" title="Opus Interactive Audio Codec – French" lang="fr" hreflang="fr" data-title="Opus Interactive Audio Codec" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%98%A4%ED%91%B8%EC%8A%A4_(%EC%98%A4%EB%94%94%EC%98%A4_%ED%8F%AC%EB%A7%B7)" title="오푸스 (오디오 포맷) – Korean" lang="ko" hreflang="ko" data-title="오푸스 (오디오 포맷)" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Opus_(format_audio)" title="Opus (format audio) – Indonesian" lang="id" hreflang="id" data-title="Opus (format audio)" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Opus_(codec_audio)" title="Opus (codec audio) – Italian" lang="it" hreflang="it" data-title="Opus (codec audio)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%95%D7%A4%D7%95%D7%A1_(%D7%9E%D7%A7%D7%95%D7%93%D7%93)" title="אופוס (מקודד) – Hebrew" lang="he" hreflang="he" data-title="אופוס (מקודד)" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Opus_(hangform%C3%A1tum)" title="Opus (hangformátum) – Hungarian" lang="hu" hreflang="hu" data-title="Opus (hangformátum)" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%93%E0%B4%AA%E0%B5%8D%E0%B4%AA%E0%B4%B8%E0%B5%8D" title="ഓപ്പസ് – Malayalam" lang="ml" hreflang="ml" data-title="ഓപ്പസ്" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Opus_(audioformaat)" title="Opus (audioformaat) – Dutch" lang="nl" hreflang="nl" data-title="Opus (audioformaat)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Opus_(%E9%9F%B3%E5%A3%B0%E5%9C%A7%E7%B8%AE)" title="Opus (音声圧縮) – Japanese" lang="ja" hreflang="ja" data-title="Opus (音声圧縮)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Opus_(format)" title="Opus (format) – Polish" lang="pl" hreflang="pl" data-title="Opus (format)" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Opus_(codec)" title="Opus (codec) – Portuguese" lang="pt" hreflang="pt" data-title="Opus (codec)" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Opus_(%D0%BA%D0%BE%D0%B4%D0%B5%D0%BA)" title="Opus (кодек) – Russian" lang="ru" hreflang="ru" data-title="Opus (кодек)" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Opus_(%C3%A4%C3%A4nenpakkaus)" title="Opus (äänenpakkaus) – Finnish" lang="fi" hreflang="fi" data-title="Opus (äänenpakkaus)" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Opus_(ljudformat)" title="Opus (ljudformat) – Swedish" lang="sv" hreflang="sv" data-title="Opus (ljudformat)" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Opus_(ses_format%C4%B1)" title="Opus (ses formatı) – Turkish" lang="tr" hreflang="tr" data-title="Opus (ses formatı)" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Opus_(%D0%BA%D0%BE%D0%B4%D0%B5%D0%BA)" title="Opus (кодек) – Ukrainian" lang="uk" hreflang="uk" data-title="Opus (кодек)" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/Opus_(%E9%9F%B3%E9%A2%91%E6%A0%BC%E5%BC%8F)" title="Opus (音频格式) – Chinese" lang="zh" hreflang="zh" data-title="Opus (音频格式)" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1466199#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a 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screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><caption class="infobox-title" style="padding-bottom:0.15em;">Opus</caption><tbody><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:Opus_logo2.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/Opus_logo2.svg/150px-Opus_logo2.svg.png" decoding="async" width="150" height="85" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/Opus_logo2.svg/225px-Opus_logo2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/02/Opus_logo2.svg/300px-Opus_logo2.svg.png 2x" data-file-width="512" data-file-height="291" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;"><a href="/wiki/Filename_extension" title="Filename extension">Filename extension</a></th><td class="infobox-data" style="line-height:1.35em;"><style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><div class="monospaced"> .opus<sup id="cite_ref-MIME-and-FileExt_1-0" class="reference"><a href="#cite_note-MIME-and-FileExt-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></div></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;"><a href="/wiki/Media_type" title="Media type">Internet media type</a></th><td class="infobox-data" style="line-height:1.35em;"><code>audio/ogg</code><sup id="cite_ref-Ogg_2-0" class="reference"><a href="#cite_note-Ogg-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><br /><code>audio/opus</code> (RTP)<sup id="cite_ref-OpusMIME_3-0" class="reference"><a href="#cite_note-OpusMIME-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;">Developed by</th><td class="infobox-data" style="line-height:1.35em;"><a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a> <a rel="nofollow" class="external text" href="http://www.ietf.org/mailman/listinfo/codec">codec</a> working group</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;">Initial release</th><td class="infobox-data" style="line-height:1.35em;">September 11, 2012<span class="noprint">; 12 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">2012-09-11</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;">Type of format</th><td class="infobox-data" style="line-height:1.35em;"><a href="/wiki/Lossy_compression" title="Lossy compression">Lossy</a> <a href="/wiki/Audio_file_format" title="Audio file format">audio</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;">Contained by</th><td class="infobox-data" style="line-height:1.35em;"><a href="/wiki/Ogg" title="Ogg">Ogg</a>, <a href="/wiki/Matroska" title="Matroska">Matroska</a>, <a href="/wiki/WebM" title="WebM">WebM</a>, <a href="/wiki/MPEG-TS" class="mw-redirect" title="MPEG-TS">MPEG-TS</a>, <a href="/wiki/ISO_base_media_file_format" title="ISO base media file format">ISOBMFF</a>, <a href="/wiki/Core_Audio_Format" title="Core Audio Format">CAF</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;">Extended from</th><td class="infobox-data" style="line-height:1.35em;"><a href="/wiki/SILK" title="SILK">SILK</a>, <a href="/wiki/CELT" title="CELT">CELT</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;"><a href="/wiki/International_standard" title="International standard">Standard</a></th><td class="infobox-data" style="line-height:1.35em;"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6716">6716</a></td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;"><span class="nowrap"><a href="/wiki/Open_file_format" title="Open file format">Open format</a>?</span></th><td class="infobox-data" style="line-height:1.35em;">Yes</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;"><span class="nowrap"><a href="/wiki/Open_standard#Comparison_of_definitions" title="Open standard">Free format</a>?</span></th><td class="infobox-data" style="line-height:1.35em;">Yes</td></tr><tr><th scope="row" class="infobox-label" style="line-height:1.2em; padding-right:0.65em;">Website</th><td class="infobox-data" style="line-height:1.35em;"><span class="url"><a rel="nofollow" class="external text" href="https://opus-codec.org/">opus-codec<wbr />.org</a></span></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"><table class="infobox vevent"><caption class="infobox-title summary">libopus</caption><tbody><tr><td colspan="2" class="infobox-image logo"><span typeof="mw:File"><a href="/wiki/File:Libopus_1.3.1_screenshot.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Libopus_1.3.1_screenshot.png/250px-Libopus_1.3.1_screenshot.png" decoding="async" width="250" height="162" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Libopus_1.3.1_screenshot.png/375px-Libopus_1.3.1_screenshot.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Libopus_1.3.1_screenshot.png/500px-Libopus_1.3.1_screenshot.png 2x" data-file-width="638" data-file-height="413" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data"><a href="/wiki/Xiph.Org_Foundation" title="Xiph.Org Foundation">Xiph.Org Foundation</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">August 26, 2012<span style="display:none"> (<span class="bday dtstart published updated itvstart">2012-08-26</span>)</span></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">1.5.2 / April 12, 2024<span class="noprint">; 7 months ago</span><span style="display:none"> (<span class="bday dtstart published updated">2024-04-12</span>)</span></div></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/ANSI_C#C89" title="ANSI C">C89</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Computing_platform" title="Computing platform">Platform</a></th><td class="infobox-data"><a href="/wiki/Cross-platform" class="mw-redirect" title="Cross-platform">Cross-platform</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Audio_codec" title="Audio codec">Audio codec</a>, <a href="/wiki/Reference_implementation_(computing)" class="mw-redirect" title="Reference implementation (computing)">reference implementation</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/w/index.php?title=3-clause_BSD_license_plus_patent_license&action=edit&redlink=1" class="new" title="3-clause BSD license plus patent license (page does not exist)">3-clause BSD license plus patent license</a> <span class="url"><a rel="nofollow" class="external text" href="https://opensource.org/license/bsdpluspatent">Opus License</a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://opus-codec.org/downloads/">Opus codec downloads</a></span></td></tr></tbody></table> <p><b>Opus</b> is a <a href="/wiki/Lossy_audio_compression" class="mw-redirect" title="Lossy audio compression">lossy</a> <a href="/wiki/Audio_coding_format" title="Audio coding format">audio coding format</a> developed by the <a href="/wiki/Xiph.Org_Foundation" title="Xiph.Org Foundation">Xiph.Org Foundation</a> and standardized by the <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">Internet Engineering Task Force</a>, designed to efficiently <a href="/wiki/Speech_coding" title="Speech coding">code speech</a> and general audio in a single format, while remaining <a href="/wiki/Latency_(audio)" title="Latency (audio)">low-latency</a> enough for real-time interactive communication and low-complexity enough for low-end embedded processors.<sup id="cite_ref-homepage_4-0" class="reference"><a href="#cite_note-homepage-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ars-role_5-0" class="reference"><a href="#cite_note-ars-role-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Opus replaces both <a href="/wiki/Vorbis" title="Vorbis">Vorbis</a> and <a href="/wiki/Speex" title="Speex">Speex</a> for new applications, and several blind listening tests have ranked it higher-quality than any other standard audio format at any given bitrate until <a href="/wiki/Transparency_(data_compression)" title="Transparency (data compression)">transparency</a> is reached, including <a href="/wiki/MP3" title="MP3">MP3</a>, <a href="/wiki/Advanced_Audio_Coding" title="Advanced Audio Coding">AAC</a>, and <a href="/wiki/High-Efficiency_Advanced_Audio_Coding" title="High-Efficiency Advanced Audio Coding">HE-AAC</a>.<sup id="cite_ref-testsummary_6-0" class="reference"><a href="#cite_note-testsummary-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-96kListeningTest_7-0" class="reference"><a href="#cite_note-96kListeningTest-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>Opus combines the speech-oriented <a href="/wiki/Linear_predictive_coding" title="Linear predictive coding">LPC</a>-based <a href="/wiki/SILK" title="SILK">SILK</a> algorithm and the lower-latency <a href="/wiki/Modified_discrete_cosine_transform" title="Modified discrete cosine transform">MDCT</a>-based <a href="/wiki/CELT" title="CELT">CELT</a> algorithm, switching between or combining them as needed for maximal efficiency.<sup id="cite_ref-homepage_4-1" class="reference"><a href="#cite_note-homepage-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Bitrate, audio bandwidth, complexity, and algorithm can all be adjusted seamlessly in each frame. Opus has the low algorithmic delay (26.5 ms by default)<sup id="cite_ref-ValinAES135_8-0" class="reference"><a href="#cite_note-ValinAES135-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> necessary for use as part of a real-time communication link, <a href="/wiki/Networked_music_performance" title="Networked music performance">networked music performances</a>, and live <a href="/wiki/Lip_sync" title="Lip sync">lip sync</a>; by trading off quality or bitrate, the delay can be reduced down to 5 ms. Its delay is exceptionally low compared to competing codecs, which require well over 100 ms, yet Opus performs very competitively with these formats in terms of quality per bitrate.<sup id="cite_ref-testing_9-0" class="reference"><a href="#cite_note-testing-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>As an <a href="/wiki/Open_format" class="mw-redirect" title="Open format">open format</a> standardized through RFC 6716, a <a href="/wiki/Reference_implementation" title="Reference implementation">reference implementation</a> called <b>libopus</b> is available under the <a href="/wiki/New_BSD_License" class="mw-redirect" title="New BSD License">New BSD License</a>. The reference has both <a href="/wiki/Fixed-point_arithmetic" title="Fixed-point arithmetic">fixed-point</a> and <a href="/wiki/Floating-point" class="mw-redirect" title="Floating-point">floating-point</a> optimizations for low- and high-end devices, with <a href="/wiki/SIMD" class="mw-redirect" title="SIMD">SIMD</a> optimizations on platforms that support them. All known <a href="/wiki/Software_patent" title="Software patent">software patents</a> that cover Opus are licensed under <a href="/wiki/Royalty-free" title="Royalty-free">royalty-free</a> terms.<sup id="cite_ref-OpusLicense_10-0" class="reference"><a href="#cite_note-OpusLicense-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Opus is widely used as a <a href="/wiki/Voice_over_IP" title="Voice over IP">voice over IP</a> (VoIP) codec in applications such as <a href="/wiki/Discord" title="Discord">Discord</a>,<sup id="cite_ref-What_Features_Does_Discord_Have_11-0" class="reference"><a href="#cite_note-What_Features_Does_Discord_Have-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> <a href="/wiki/WhatsApp" title="WhatsApp">WhatsApp</a>,<sup id="cite_ref-Register_12-0" class="reference"><a href="#cite_note-Register-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Srivastava_13-0" class="reference"><a href="#cite_note-Srivastava-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Hazra_14-0" class="reference"><a href="#cite_note-Hazra-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> and the <a href="/wiki/PlayStation_4" title="PlayStation 4">PlayStation 4</a>.<sup id="cite_ref-playstation_15-0" class="reference"><a href="#cite_note-playstation-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Features">Features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=1" title="Edit section: Features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Opus_bitrate%2Blatency_comparison.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Opus_bitrate%2Blatency_comparison.svg/220px-Opus_bitrate%2Blatency_comparison.svg.png" decoding="async" width="220" height="162" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Opus_bitrate%2Blatency_comparison.svg/330px-Opus_bitrate%2Blatency_comparison.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Opus_bitrate%2Blatency_comparison.svg/440px-Opus_bitrate%2Blatency_comparison.svg.png 2x" data-file-width="674" data-file-height="497" /></a><figcaption>Possible bitrate and latency combinations compared with other audio formats</figcaption></figure> <p>Opus supports <a href="/wiki/Constant_bitrate" title="Constant bitrate">constant</a> and <a href="/wiki/Variable_bitrate" title="Variable bitrate">variable bitrate</a> encoding from 6 <a href="/wiki/Kilobit" class="mw-redirect" title="Kilobit">kbit</a>/s to 510 kbit/s (or up to 256 kbit/s per channel for multi-channel tracks), frame sizes from 2.5 ms to 60 ms, and five <a href="/wiki/Sampling_rate" class="mw-redirect" title="Sampling rate">sampling rates</a> from 8 kHz (with 4 kHz bandwidth) to 48 kHz (with 20 kHz bandwidth, the human <a href="/wiki/Hearing_range" title="Hearing range">hearing range</a>). An Opus stream can support up to 255 <a href="/wiki/Communication_channel" title="Communication channel">audio channels</a>, and it allows <a href="/wiki/Joint_encoding" title="Joint encoding">channel coupling</a> between channels in groups of two using mid-side coding. </p><p>Opus has very short <a href="/wiki/Latency_(audio)" title="Latency (audio)">latency</a> (26.5 ms using the default 20 ms frames and default application setting), which makes it suitable for <a href="/wiki/Real-time_computing" title="Real-time computing">real-time applications</a> such as <a href="/wiki/Telephony" title="Telephony">telephony</a>, <a href="/wiki/Voice_over_IP" title="Voice over IP">Voice over IP</a> and <a href="/wiki/Videoconferencing" class="mw-redirect" title="Videoconferencing">videoconferencing</a>; research by <a href="/wiki/Xiph.Org_Foundation" title="Xiph.Org Foundation">Xiph</a> led to the <a href="/wiki/CELT" title="CELT">CELT</a> codec, which allows the highest quality while maintaining low delay. In any Opus stream, the bitrate, bandwidth, and delay can be continually varied without introducing any distortion or discontinuity; even mixing packets from different streams will cause a smooth change, rather than the distortion common in other codecs. Unlike Vorbis, Opus does not require large <a href="/wiki/Codebook#Data_compression" title="Codebook">codebooks</a> for each individual file, making it more efficient for short clips of audio and more resilient. </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:FSsongmetal2-Opus-exp7.20120823-sweep.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/88/FSsongmetal2-Opus-exp7.20120823-sweep.png/400px-FSsongmetal2-Opus-exp7.20120823-sweep.png" decoding="async" width="400" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/88/FSsongmetal2-Opus-exp7.20120823-sweep.png/600px-FSsongmetal2-Opus-exp7.20120823-sweep.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/88/FSsongmetal2-Opus-exp7.20120823-sweep.png/800px-FSsongmetal2-Opus-exp7.20120823-sweep.png 2x" data-file-width="5000" data-file-height="1000" /></a><figcaption><a href="/wiki/Spectrogram" title="Spectrogram">Spectrogram</a> of Opus-encoded (~1.0) audio as bitrate rises (~32 to ~160 kbit/s) clearly shows lowpass behavior and better preservation of the band energy with CELT (compare <a href="https://commons.wikimedia.org/wiki/Opus#Spectrograms_in_comparison" class="extiw" title="commons:Opus">original, Vorbis, MP3, AAC</a>).</figcaption></figure> <p>The Opus format is based on a combination of the full-bandwidth <a href="/wiki/CELT" title="CELT">CELT</a> format and the speech-oriented <a href="/wiki/SILK" title="SILK">SILK</a> format, both heavily modified: CELT is based on the <a href="/wiki/Modified_discrete_cosine_transform" title="Modified discrete cosine transform">modified discrete cosine transform</a> (MDCT) that most music codecs use, using <a href="/wiki/Code-excited_linear_prediction" title="Code-excited linear prediction">CELP</a> techniques in the frequency domain for better prediction, while SILK uses <a href="/wiki/Linear_predictive_coding" title="Linear predictive coding">linear predictive coding</a> (LPC) and an optional Long-Term Prediction filter to model speech. In Opus, both were modified to support more frame sizes, as well as further algorithmic improvements and integration, such as using CELT's <a href="/wiki/Range_encoding" class="mw-redirect" title="Range encoding">range encoder</a> for both types. To minimize overhead at low bitrates, if latency is not as pressing, SILK has support for packing multiple 20 ms frames together, sharing context and headers; SILK also allows Low Bitrate Redundancy (LBRR) frames, allowing low-quality packet loss recovery. CELT includes both spectral replication and noise generation, similar to AAC's SBR and PNS, and can further save bits by filtering out all harmonics of tonal sounds entirely, then replicating them in the decoder.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Better tone detection is an ongoing project to improve quality. </p><p>The format has three different modes: speech, hybrid, and CELT. When compressing speech, SILK is used for audio frequencies up to 8 kHz. If wider bandwidth is desired, a hybrid mode uses CELT to encode the frequency range above 8 kHz. The third mode is pure-CELT, designed for general audio. SILK is inherently VBR and cannot hit a bitrate target, while CELT can always be encoded to any specific number of bytes, enabling hybrid and CELT mode when CBR is required. </p><p>SILK supports frame sizes of 10, 20, 40 and 60 ms. CELT supports frame sizes of 2.5, 5, 10 and 20 ms. Thus, hybrid mode only supports frame sizes of 10 and 20 ms; frames shorter than 10 ms will always use CELT mode. A typical Opus packet contains a single frame, but packets of up to 120 ms are produced by combining multiple frames per packet. Opus can transparently switch between modes, frame sizes, bandwidths, and channel counts on a per-packet basis, although specific applications may choose to limit this. </p><p>The reference implementation is written in <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> and compiles on hardware architectures with or without a <a href="/wiki/Floating-point_unit" title="Floating-point unit">floating-point unit</a>, although floating-point is currently required for audio bandwidth detection (dynamic switching between SILK, CELT, and hybrid encoding) and most speed optimizations. </p> <div class="mw-heading mw-heading3"><h3 id="Containers">Containers</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=2" title="Edit section: Containers"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Opus packets are not self-delimiting, but are designed to be used inside a <a href="/wiki/Container_file_format" class="mw-redirect" title="Container file format">container</a> of some sort which supplies the decoder with each packet's length. Opus was originally specified for encapsulation in <a href="/wiki/Ogg" title="Ogg">Ogg</a> containers, specified as <code>audio/ogg; codecs=opus</code>, and for Ogg Opus files the <code>.opus</code> filename extension is recommended.<sup id="cite_ref-Ogg_2-1" class="reference"><a href="#cite_note-Ogg-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Opus streams are also supported in <a href="/wiki/Matroska" title="Matroska">Matroska</a>,<sup id="cite_ref-Matroska_17-0" class="reference"><a href="#cite_note-Matroska-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> <a href="/wiki/WebM" title="WebM">WebM</a>,<sup id="cite_ref-webm-guidelines_18-0" class="reference"><a href="#cite_note-webm-guidelines-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> <a href="/wiki/MPEG-TS" class="mw-redirect" title="MPEG-TS">MPEG-TS</a>,<sup id="cite_ref-mpeg-ts_19-0" class="reference"><a href="#cite_note-mpeg-ts-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/MP4_file_format" title="MP4 file format">MP4</a>.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p><p>Alternatively, each Opus packet may be wrapped in a <a href="/wiki/Network_packet" title="Network packet">network packet</a> which supplies the packet length. Opus packets may be sent over an ordered datagram protocol such as <a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">RTP</a>.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p><p>An optional self-delimited packet format is defined in an appendix to the specification.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> This uses one or two additional bytes per packet to encode the packet length, allowing packets to be concatenated without encapsulation. </p> <div class="mw-heading mw-heading3"><h3 id="Bandwidth_and_sampling_rate">Bandwidth and sampling rate</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=3" title="Edit section: Bandwidth and sampling rate"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Wideband_audio" title="Wideband audio">Wideband audio</a></div> <p>Opus allows the following bandwidths during encoding. Opus compression does not depend on the input sample rate; timestamps are measured in 48 kHz units even if the full bandwidth is not used. Likewise, the output sample rate may be freely chosen. For example, audio can be input at 16 kHz yet be set to encode only narrowband audio.<sup id="cite_ref-rfc-sample_rates_23-0" class="reference"><a href="#cite_note-rfc-sample_rates-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable" style="text-align:center;"> <tbody><tr> <th>Abbreviation </th> <th>Audio<br />bandwidth </th> <th>Effective<br />sample rate </th></tr> <tr> <td style="text-align:left;">NB (narrowband) </td> <td><span style="visibility:hidden;color:transparent;">0</span>4 kHz </td> <td><span style="visibility:hidden;color:transparent;">0</span>8 kHz </td></tr> <tr> <td style="text-align:left;">MB (medium-band)<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup> </td> <td><span style="visibility:hidden;color:transparent;">0</span>6 kHz </td> <td>12 kHz </td></tr> <tr> <td style="text-align:left;">WB (wideband) </td> <td><span style="visibility:hidden;color:transparent;">0</span>8 kHz </td> <td>16 kHz </td></tr> <tr> <td style="text-align:left;">SWB (super-wideband) </td> <td>12 kHz </td> <td>24 kHz </td></tr> <tr> <td style="text-align:left;">FB (fullband)<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>note 2<span class="cite-bracket">]</span></a></sup> </td> <td>20 kHz </td> <td>48 kHz </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=4" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/CELT#History" title="CELT">CELT § History</a>, and <a href="/wiki/SILK#History" title="SILK">SILK § History</a></div> <p>Opus was proposed for the standardization of a new audio format at the IETF, which was eventually accepted and granted by the <i>codec</i> <a href="/wiki/Working_group" title="Working group">working group</a>. It is based on two initially separate standard proposals from the Xiph.Org Foundation and Skype Technologies S.A. (now <a href="/wiki/Microsoft" title="Microsoft">Microsoft</a>). Its main developers are Jean-Marc Valin (Xiph.Org, Octasic, <a href="/wiki/Mozilla_Corporation" title="Mozilla Corporation">Mozilla Corporation</a>, Amazon), Koen Vos (Skype), and Timothy B. Terriberry (Xiph.Org, Mozilla Corporation, Amazon). Among others, Juin-Hwey (Raymond) Chen (<a href="/wiki/Broadcom" title="Broadcom">Broadcom</a>), Gregory Maxwell (Xiph.Org, <a href="/wiki/Wikimedia_movement" title="Wikimedia movement">Wikimedia</a>), and <a href="/wiki/Chris_Montgomery" title="Chris Montgomery">Chris Montgomery</a> (Xiph.Org) were also involved. </p><p>The development of the CELT part of the format goes back to thoughts on a successor for <a href="/wiki/Vorbis" title="Vorbis">Vorbis</a> under the working name <i>Ghost</i>. As a newer speech codec from the Xiph.Org Foundation, Opus replaces Xiph's older speech codec <a href="/wiki/Speex" title="Speex">Speex</a>, an earlier project of Jean-Marc Valin. CELT has been worked on since November 2007. </p><p>The SILK part has been under development at Skype since January 2007 as the successor of their <a href="/wiki/SVOPC" title="SVOPC">SVOPC</a>, an internal project to make the company independent from third-party codecs like <a href="/wiki/Internet_Speech_Audio_Codec" title="Internet Speech Audio Codec">iSAC</a> and <a href="/wiki/Internet_Low_Bitrate_Codec" title="Internet Low Bitrate Codec">iLBC</a> and respective license payments. </p><p>In March 2009, Skype suggested the development and standardization of a wideband audio format within the IETF. Nearly a year passed with much debate on the formation of an appropriate <a href="/wiki/Working_group" title="Working group">working group</a>.<sup id="cite_ref-WGformation_26-0" class="reference"><a href="#cite_note-WGformation-26"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> Representatives of several companies which were taking part in the standardization of patent-encumbered competing format, including <a href="/wiki/Polycom" class="mw-redirect" title="Polycom">Polycom</a> and <a href="/wiki/Ericsson" title="Ericsson">Ericsson</a>—the creators and licensors of <a href="/wiki/G.719" title="G.719">G.719</a>—as well as <a href="/wiki/France_T%C3%A9l%C3%A9com" class="mw-redirect" title="France Télécom">France Télécom</a>, <a href="/wiki/Huawei" title="Huawei">Huawei</a> and the <a href="/wiki/Orange_Labs" class="mw-redirect" title="Orange Labs">Orange Labs</a> (department of France Télécom), which were involved in the creation of <a href="/wiki/G.718" title="G.718">G.718</a>, stated objections against the start of the standardization process for a royalty-free format. (Some of the opponents would later claim patent rights that Xiph dismissed; see below.)<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> The working group finally formed in February 2010, and even the corresponding Study Group 16 from the ITU-T pledged to support its work. </p><p>In July 2010, a prototype of a hybrid format was presented that combined the two proposed format candidates SILK and CELT. In September 2010, Opus was submitted to the IETF as proposal for standardization. For a short time the format went under the name of <i>Harmony</i> before it got its present name in October 2010.<sup id="cite_ref-renaming_28-0" class="reference"><a href="#cite_note-renaming-28"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> At the beginning of February 2011, the <a href="/wiki/Bitstream" title="Bitstream">bitstream</a> format was tentatively frozen, subject to last changes.<sup id="cite_ref-pre-freeze_29-0" class="reference"><a href="#cite_note-pre-freeze-29"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> Near the end of July 2011, Jean-Marc Valin was hired by the <a href="/wiki/Mozilla_Corporation" title="Mozilla Corporation">Mozilla Corporation</a> to continue working on Opus.<sup id="cite_ref-job_30-0" class="reference"><a href="#cite_note-job-30"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Finalization_(1.0)"><span id="Finalization_.281.0.29"></span>Finalization (1.0)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=5" title="Edit section: Finalization (1.0)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In November 2011, the working group issued the last call for changes on the bitstream format. The bitstream has been frozen since January 8, 2012.<sup id="cite_ref-bitstream_frozen_31-0" class="reference"><a href="#cite_note-bitstream_frozen-31"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> On July 2, 2012, Opus was approved by the <a href="/wiki/IETF" class="mw-redirect" title="IETF">IETF</a> for standardization.<sup id="cite_ref-jmvalin_32-0" class="reference"><a href="#cite_note-jmvalin-32"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> The reference software entered release candidate state on August 8, 2012.<sup id="cite_ref-RC_33-0" class="reference"><a href="#cite_note-RC-33"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> The final specification was released as RFC 6716 on September 10, 2012.<sup id="cite_ref-MozillaHacks2_34-0" class="reference"><a href="#cite_note-MozillaHacks2-34"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ietf-announce_35-0" class="reference"><a href="#cite_note-ietf-announce-35"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> and versions 1.0 and 1.0.1 of the <a href="/wiki/Reference_implementation" title="Reference implementation">reference implementation</a> libopus were released the day after. </p><p>On July 11, 2013, libopus 1.0.3 brought bug fixes and a new <a href="/wiki/Surround_sound" title="Surround sound">Surround sound</a> API that improves channel allocation and quality, especially for <a href="/wiki/Low-frequency_effects" title="Low-frequency effects">LFE</a>.<sup id="cite_ref-opus11_36-0" class="reference"><a href="#cite_note-opus11-36"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="1.1">1.1</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=6" title="Edit section: 1.1"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On December 5, 2013, libopus 1.1 was released,<sup id="cite_ref-opus11_36-1" class="reference"><a href="#cite_note-opus11-36"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> incorporating overall speed improvements and significant encoder quality improvements: Tonality estimation boosts bitrate and quality for previously <a rel="nofollow" class="external text" href="http://listening-tests.hydrogenaud.io/igorc/Public%20Multiformat%20Listening%20Test%20@%2064kbps.htm">problematic samples</a>, like harpsichords; automated speech/music detection improves quality in mixed audio; <a href="/wiki/Joint_stereo" class="mw-redirect" title="Joint stereo">mid-side stereo</a> reduces the bitrate needs of many songs; band precision boosting for improved transients; and DC rejection below 3 Hz. Two new <a href="/wiki/Variable_bitrate" title="Variable bitrate">VBR</a> modes were added: unconstrained for more consistent quality, and temporal VBR that boosts louder frames and generally improves quality. </p><p>libopus 1.1.1 was released on November 26, 2015, and 1.1.2 on January 12, 2016, both adding speed optimizations and bug fixes. July 15, 2016 saw the release of version 1.1.3 and includes bug fixes, optimizations, documentation updates and experimental <a href="/wiki/Ambisonics" title="Ambisonics">Ambisonics</a> work. </p> <div class="mw-heading mw-heading3"><h3 id="1.2">1.2</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=7" title="Edit section: 1.2"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>libopus 1.2 Beta was released on May 24, 2017. libopus 1.2 was released on June 20, 2017.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> Improvements brought in 1.2 allow it to create fullband music at bitrates as low as 32 kbit/s, and wideband speech at just 12 kbit/s.<sup id="cite_ref-XDA_Opus_1.2_38-0" class="reference"><a href="#cite_note-XDA_Opus_1.2-38"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> </p><p>libopus 1.2 includes optional support for the decoder specification changes made in drafts of RFC 8251, improving the quality of output from such low-rate streams.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="1.3">1.3</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=8" title="Edit section: 1.3"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>libopus 1.3 was released on October 18, 2018.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> The Opus 1.3 major release again brings quality improvements, new features, and bug fixes.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Changes since 1.2.x include: </p> <ul><li>Improvements to voice activity detection (VAD) and speech/music classification using a recurrent neural network (RNN)</li> <li>Support for ambisonics coding using channel mapping families 2 and 3</li> <li>Improvements to stereo speech coding at low bitrate</li> <li>Using wideband speech encoding down to 9 kbit/s (mediumband is no longer used)</li> <li>Making it possible to use SILK down to bitrates around 5 kbit/s</li> <li>Minor quality improvement on tones</li> <li>Enabling the spec fixes in RFC 8251 by default</li> <li>Security/hardening improvements</li></ul> <p>Notable bug fixes include: </p> <ul><li>Fixes to the CELT <a href="/wiki/Packet_loss_concealment" title="Packet loss concealment">PLC</a></li> <li>Bandwidth detection fixes</li></ul> <div class="mw-heading mw-heading4"><h4 id="1.3.1">1.3.1</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=9" title="Edit section: 1.3.1"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>libopus 1.3.1 was released on April 12, 2019.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> This Opus 1.3.1 minor release fixes an issue with the analysis on files with digital silence (all zeros), especially on <a href="/wiki/X87" title="X87">x87</a> builds (mostly affects 32-bit builds). It also includes two new features: </p> <ul><li>A new OPUS_GET_IN_DTX query to know if the encoder is in DTX mode (last frame was either a comfort noise frame or not encoded at all)</li> <li>A new (and still experimental) <a href="/wiki/CMake" title="CMake">CMake</a>-based build system that is eventually meant to replace the <a href="/wiki/Visual_Studio_2015" class="mw-redirect" title="Visual Studio 2015">VS2015</a> build system (the <a href="/wiki/Autotools" class="mw-redirect" title="Autotools">autotools</a> build system will stay)</li></ul> <div class="mw-heading mw-heading3"><h3 id="1.4">1.4</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=10" title="Edit section: 1.4"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>libopus 1.4 was released on April 20, 2023.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> Opus 1.4 brings the following improvements and fixes: </p> <ul><li>Improved tuning of the Opus in-band <a href="/wiki/Forward_error_correction" class="mw-redirect" title="Forward error correction">FEC</a> called LBRR (Low-bitrate redundancy)<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> which previously was causing a significant drop in audio quality under certain circumstances<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup></li> <li>Added a OPUS_SET_INBAND_FEC(2) option that turns on FEC, but does not force SILK mode (FEC will be disabled in CELT mode)</li> <li>Improved tuning and various fixes to <a href="/wiki/Discontinuous_Transmission" class="mw-redirect" title="Discontinuous Transmission">DTX</a></li> <li>Added <a href="/wiki/Meson_(software)" title="Meson (software)">Meson</a> support, improved <a href="/wiki/CMake" title="CMake">CMake</a> support</li></ul> <div class="mw-heading mw-heading3"><h3 id="1.5">1.5</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=11" title="Edit section: 1.5"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>libopus 1.5 was released on March 4, 2024.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> It added the following backward-compatible improvements: </p> <ul><li>Improved packet loss concealment using a deep neural network.</li> <li>Improved redundancy to prevent packet loss using a <a href="/wiki/Rate-Distortion_Optimization" class="mw-redirect" title="Rate-Distortion Optimization">rate-distortion-optimized</a> variational <a href="/wiki/Autoencoder" title="Autoencoder">autoencoder</a>.</li> <li>Improved concealment of coding artifacts by adjusting post-filter coefficients using a deep neural network.</li> <li>Support for additional <a href="/wiki/SIMD" class="mw-redirect" title="SIMD">SIMD</a> CPU instructions; <a href="/wiki/AVX2" class="mw-redirect" title="AVX2">AVX2</a> on <a href="/wiki/X86-64" title="X86-64">x86-64</a> and <a href="/wiki/NEON_(instruction_set)" class="mw-redirect" title="NEON (instruction set)">NEON</a> on <a href="/wiki/Aarch64" class="mw-redirect" title="Aarch64">Aarch64</a>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Current_development">Current development</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=12" title="Edit section: Current development"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The codec is under active development.<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> The current focus is on adding a <a href="/wiki/Deep_learning" title="Deep learning">deep learning</a> based redundancy <a href="/wiki/Audio_codec" title="Audio codec">encoder</a> that enhances packet loss concealment by embedding one second of recovery data in each encoded packet. The deep redundancy (DRED) algorithm was developed by among others Jean-Marc Valin, Ahmed Mustafa, Jan Büthe, Timothy Terriberry, <a href="/wiki/Chris_Montgomery" title="Chris Montgomery">Chris Montgomery</a>, Michael Klingbeil, and <a href="/wiki/Paris_Smaragdis" title="Paris Smaragdis">Paris Smaragdis</a> from <a href="/wiki/Amazon_Web_Services" title="Amazon Web Services">Amazon Web Services</a><sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> with sponsorship to open source the algorithm and subsequently extend the <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a> standard from Sid Rao.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> This encoder is a backwards compatible change to the codec enabling customers to easily upgrade applications to take advantage of this machine learning capability. A <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/draft-ietf-mlcodec-opus-extension/">draft RFC</a> is underway to standardize the new capability.<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> This RFC is one of the first attempts to standardize a deep learning algorithm in the IETF. </p> <div class="mw-heading mw-heading2"><h2 id="Quality_comparison_and_low-latency_performance">Quality comparison and low-latency performance</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=13" title="Edit section: Quality comparison and low-latency performance"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Opus_quality_comparison_colorblind_compatible.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Opus_quality_comparison_colorblind_compatible.svg/360px-Opus_quality_comparison_colorblind_compatible.svg.png" decoding="async" width="360" height="267" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Opus_quality_comparison_colorblind_compatible.svg/540px-Opus_quality_comparison_colorblind_compatible.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Opus_quality_comparison_colorblind_compatible.svg/720px-Opus_quality_comparison_colorblind_compatible.svg.png 2x" data-file-width="1010" data-file-height="750" /></a><figcaption>Comparison of coding efficiency between Opus and other popular audio formats</figcaption></figure> <p>Opus performs well at both low and high <a href="/wiki/Bit_rate" title="Bit rate">bitrates</a>.<sup id="cite_ref-testing_9-1" class="reference"><a href="#cite_note-testing-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1096940132">.mw-parser-output .listen .side-box-text{line-height:1.1em}.mw-parser-output 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.plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><figure class="mw-halign-center" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Gnome-mime-sound-openclipart.svg/50px-Gnome-mime-sound-openclipart.svg.png" decoding="async" width="50" height="50" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Gnome-mime-sound-openclipart.svg/75px-Gnome-mime-sound-openclipart.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/87/Gnome-mime-sound-openclipart.svg/100px-Gnome-mime-sound-openclipart.svg.png 2x" data-file-width="160" data-file-height="160" /></span><figcaption></figcaption></figure></div> <div class="side-box-text plainlist"><div class="haudio"> <div class="listen-file-header"><a href="/wiki/File:Test_mp3_opus_16kbps.wav" title="File:Test mp3 opus 16kbps.wav">Comparison between MP3 and Opus</a></div> <div><span typeof="mw:File"><span><audio id="mwe_player_0" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="232" style="width:232px;" data-durationhint="34" data-mwtitle="Test_mp3_opus_16kbps.wav" data-mwprovider="wikimediacommons"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/8/8f/Test_mp3_opus_16kbps.wav/Test_mp3_opus_16kbps.wav.ogg" type="audio/ogg; codecs="vorbis"" data-transcodekey="ogg" data-width="0" data-height="0" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/8/8f/Test_mp3_opus_16kbps.wav/Test_mp3_opus_16kbps.wav.mp3" type="audio/mpeg" data-transcodekey="mp3" data-width="0" data-height="0" /><source src="//upload.wikimedia.org/wikipedia/commons/8/8f/Test_mp3_opus_16kbps.wav" type="audio/wav" data-width="0" data-height="0" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&title=File%3ATest_mp3_opus_16kbps.wav&lang=en&trackformat=vtt&origin=%2A" kind="subtitles" type="text/vtt" srclang="en" label="English ‪(en)‬" data-dir="ltr" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&title=File%3ATest_mp3_opus_16kbps.wav&lang=fr&trackformat=vtt&origin=%2A" kind="subtitles" type="text/vtt" srclang="fr" label="français ‪(fr)‬" data-dir="ltr" /></audio></span></span></div> <div class="description">The first is an uncompressed WAV file, the second is an MP3 file encoded at 16 kbit/s using <a href="/wiki/LAME" title="LAME">LAME</a>, and the third is an Opus file encoded at 16 kbit/s.</div></div></div></div> <div class="side-box-abovebelow"><hr /><i class="selfreference">Problems playing this file? See <a href="/wiki/Help:Media" title="Help:Media">media help</a>.</i></div> </div> <p>In listening tests around 64 kbit/s, Opus shows superior quality compared to <a href="/wiki/High-Efficiency_Advanced_Audio_Coding" title="High-Efficiency Advanced Audio Coding">HE-AAC</a> codecs, which were previously dominant due to their use of the patented <a href="/wiki/Spectral_band_replication" title="Spectral band replication">spectral band replication</a> (SBR) technology.<sup id="cite_ref-slashdot_51-0" class="reference"><a href="#cite_note-slashdot-51"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-testsummary_6-1" class="reference"><a href="#cite_note-testsummary-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> In listening tests around 96 kbit/s, Opus shows slightly superior quality compared to <a href="/wiki/Advanced_Audio_Coding" title="Advanced Audio Coding">AAC</a> and significantly better quality compared to <a href="/wiki/Vorbis" title="Vorbis">Vorbis</a> and <a href="/wiki/MP3" title="MP3">MP3</a>.<sup id="cite_ref-96kListeningTest_7-1" class="reference"><a href="#cite_note-96kListeningTest-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-quality64_52-0" class="reference"><a href="#cite_note-quality64-52"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> </p><p>Opus has very low algorithmic delay,<sup id="cite_ref-homepage_4-2" class="reference"><a href="#cite_note-homepage-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> a necessity for use as part of a low-<a href="/wiki/Latency_(audio)" title="Latency (audio)">audio-latency</a> communication link, which can permit natural conversation, <a href="/wiki/Networked_music_performance" title="Networked music performance">networked music performances</a>, or <a href="/wiki/Lip_sync" title="Lip sync">lip sync</a> at live events. Total algorithmic delay for an audio format is the sum of delays that must be incurred in the encoder and the decoder of a live audio stream regardless of processing speed and transmission speed, such as buffering audio samples into blocks or frames, allowing for <a href="/wiki/Modified_discrete_cosine_transform" title="Modified discrete cosine transform">window overlap</a> and possibly allowing for <a href="/wiki/Noise_shaping" title="Noise shaping">noise-shaping</a> look-ahead in a decoder and any other forms of look-ahead, or for an MP3 encoder, the use of <a href="/wiki/MP3#VBR" title="MP3">bit reservoir</a>.<sup id="cite_ref-algdelay_53-0" class="reference"><a href="#cite_note-algdelay-53"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> </p><p>Total one-way latency below 150 ms is the preferred target of most <a href="/wiki/VoIP" class="mw-redirect" title="VoIP">VoIP</a> systems,<sup id="cite_ref-VoIPlatency_54-0" class="reference"><a href="#cite_note-VoIPlatency-54"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> to enable natural conversation with turn-taking little affected by delay. Musicians typically feel in-time with up to around 30 ms audio latency,<sup id="cite_ref-musiclatency_55-0" class="reference"><a href="#cite_note-musiclatency-55"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> roughly in accord with the fusion time of the <a href="/wiki/Haas_effect" class="mw-redirect" title="Haas effect">Haas effect</a>, though matching playback delay of each user's own instrument to the round-trip latency can also help.<sup id="cite_ref-carot_56-0" class="reference"><a href="#cite_note-carot-56"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Lip_sync_error#Recommendations" class="mw-redirect" title="Lip sync error">It is suggested for lip sync</a> that around 45–100 ms audio latency may be acceptable.<sup id="cite_ref-lipsync_57-0" class="reference"><a href="#cite_note-lipsync-57"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> </p><p>Opus permits trading-off reduced quality or increased bitrate to achieve an even smaller algorithmic delay (5.0 ms minimum).<sup id="cite_ref-latencyBitrateTradeoff_58-0" class="reference"><a href="#cite_note-latencyBitrateTradeoff-58"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> While the reference implementation's default Opus frame is 20.0 ms long, the SILK layer requires a further 5.0 ms lookahead plus 1.5 ms for resampling, giving a default delay of 26.5 ms. When the CELT layer is active, it requires 2.5 ms lookahead for <a href="/wiki/Modified_discrete_cosine_transform" title="Modified discrete cosine transform">window overlap</a> to which a matching delay of 4.0 ms is added by default to synchronize with the SILK layer. If the encoder is instantiated in the special <i>restricted low delay</i> mode, the 4.0 ms matching delay is removed and the SILK layer is disabled, permitting the minimal algorithmic delay of 5.0 ms.<sup id="cite_ref-ValinAES135_8-1" class="reference"><a href="#cite_note-ValinAES135-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Support">Support</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=14" title="Edit section: Support"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The format and algorithms are openly documented and the <a href="/wiki/Reference_implementation" title="Reference implementation">reference implementation</a> is published as <a href="/wiki/Free_software" title="Free software">free software</a>. Xiph's reference implementation is called <i>libopus</i> and a package called <i>opus-tools</i> provides command-line encoder and decoder utilities. It is published under the terms of a <a href="/wiki/BSD_licenses" title="BSD licenses">BSD-like license</a>. It is written in <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> and can be compiled for hardware architectures with or without a <a href="/wiki/Floating-point_unit" title="Floating-point unit">floating-point unit</a>. The accompanying diagnostic tool <i>opusinfo</i> reports detailed technical information about Opus files, including information on the standard compliance of the bitstream format. It is based on <i>ogginfo</i> from the <i>vorbis-tools</i> and therefore — unlike the encoder and decoder — is available under the terms of version 2 of the <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GPL</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Implementations">Implementations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=15" title="Edit section: Implementations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6716">6716</a> contains a complete source code for an older version of the reference implementation written in C. RFC <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8251">8251</a> contains errata. Libopus is the more up-to-date but non-normative branch of the reference implementation. </p><p>The <a href="/wiki/FFmpeg" title="FFmpeg">FFmpeg</a> project<sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> has encoder and decoder implementations not derived from the reference library. The documentation describes it as CELT-only and poorer-quality than the reference.<sup id="cite_ref-60" class="reference"><a href="#cite_note-60"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup> </p><p>The libopus reference library has been ported to both <a href="/wiki/C_Sharp_(programming_language)" title="C Sharp (programming language)">C#</a> and <a href="/wiki/Java_(programming_language)" title="Java (programming language)">Java</a> as part of a project called Concentus. These ports sacrifice performance for the sake of being easily integrated into cross-platform applications.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Software_and_content_providers">Software and content providers</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=16" title="Edit section: Software and content providers"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Comparison_of_VoIP_software" title="Comparison of VoIP software">Comparison of VoIP software</a></div> <p><a href="/wiki/Digital_Radio_Mondiale" title="Digital Radio Mondiale">Digital Radio Mondiale</a> – a digital radio format for AM frequencies – can broadcast and receive Opus audio (albeit not recognised in official standard) using Dream <a href="/wiki/Software-defined_radio" title="Software-defined radio">software-defined radio</a>. </p><p>The <a href="/wiki/Wikimedia_Foundation" title="Wikimedia Foundation">Wikimedia Foundation</a> sponsored a free and open source online <a href="/wiki/JavaScript" title="JavaScript">JavaScript</a> Opus encoder for browsers supporting the required <a href="/wiki/HTML5" title="HTML5">HTML5</a> features.<sup id="cite_ref-javascript-opus_62-0" class="reference"><a href="#cite_note-javascript-opus-62"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> </p><p>A list of radio stations that stream using Opus audio codec can be found on the <a href="/wiki/Xiph.Org_Foundation" title="Xiph.Org Foundation">Xiph.Org Foundation</a> <a href="/wiki/Icecast" title="Icecast">Icecast</a> directory.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> </p><p>In late 2014 and 2015, Google's video platform <a href="/wiki/YouTube" title="YouTube">YouTube</a> started offering Opus audio along with <a href="/wiki/VP9" title="VP9">VP9</a> video in the <a href="/wiki/WebM" title="WebM">WebM</a> file format, through <a href="/wiki/Dynamic_Adaptive_Streaming_over_HTTP" title="Dynamic Adaptive Streaming over HTTP">DASH streaming</a>.<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> In July 2024, YouTube rolled out an additional high quality audio format option, 256 kbit/s Opus, to <a href="/wiki/YouTube_Music_Premium" class="mw-redirect" title="YouTube Music Premium">YouTube Music Premium</a> subscribers.<sup id="cite_ref-youtube-format-ids-2024-july_65-0" class="reference"><a href="#cite_note-youtube-format-ids-2024-july-65"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> </p><p>Since 2016, <a href="/wiki/WhatsApp" title="WhatsApp">WhatsApp</a> has been using Opus as its audio file format.<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Signal_(messaging_app)" class="mw-redirect" title="Signal (messaging app)">Signal</a> switched from <a href="/wiki/Speex" title="Speex">Speex</a> to Opus audio codec for better audio quality in the beginning of 2017. </p><p>In 2018, <a href="/wiki/SoundCloud" title="SoundCloud">SoundCloud</a> switched from MP3 to Opus, reducing half of its required bandwidth for music streaming.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> </p><p>In January 2021, <a href="/wiki/Vimeo" title="Vimeo">Vimeo</a> introduced Opus to its video platform.<sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> </p><p>In 2021, the Danish journalism website <a href="/wiki/Zetland_(company)" title="Zetland (company)">Zetland</a> switched from MP3 to Opus for its articles' audio recordings, which attained a 35 percent reduction in bandwidth and reduced climate footprint.<sup id="cite_ref-69" class="reference"><a href="#cite_note-69"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Operating_system_support">Operating system support</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=17" title="Edit section: Operating system support"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Most end-user software relies on <a href="/wiki/Multimedia_framework" title="Multimedia framework">multimedia frameworks</a> provided by the <a href="/wiki/Operating_system" title="Operating system">operating system</a>. Native Opus codec support is implemented in most major multimedia frameworks for <a href="/wiki/Unix-like" title="Unix-like">Unix-like</a> operating systems, including <a href="/wiki/GStreamer" title="GStreamer">GStreamer</a>, <a href="/wiki/FFmpeg" title="FFmpeg">FFmpeg</a>, and <a href="/wiki/Libav" title="Libav">Libav</a> libraries.<sup id="cite_ref-gstreamer_71-0" class="reference"><a href="#cite_note-gstreamer-71"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ffmpeg_72-0" class="reference"><a href="#cite_note-ffmpeg-72"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-libav_73-0" class="reference"><a href="#cite_note-libav-73"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/WebM" title="WebM">WebM</a> container <code>.webm</code> is mostly used on <a href="/wiki/Online_video_platform" title="Online video platform">online video platforms</a> (e.g. <a href="/wiki/YouTube" title="YouTube">YouTube</a>), and is usually treated as a video file by operating systems & media players. Even if a WebM file contains only Opus audio and no video, some music players do not recognize WebM files as audio files and do not support reading of file metadata.<sup id="cite_ref-74" class="reference"><a href="#cite_note-74"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/Ogg" title="Ogg">Ogg</a> container <code>.opus</code> is preferred for audio-only files, and most media players have support for audio file metadata tagged in the <a href="/wiki/Vorbis_comment" title="Vorbis comment">Vorbis comment</a> format. </p><p><a href="/wiki/Google" title="Google">Google</a> added native support for Opus audio playback in <a href="/wiki/Android_Lollipop" title="Android Lollipop">Android 5.0 "Lollipop"</a>.<sup id="cite_ref-android_dev_75-0" class="reference"><a href="#cite_note-android_dev-75"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup> However, it was limited to Opus audio encapsulated in <a href="/wiki/Matroska" title="Matroska">Matroska</a> and <a href="/wiki/WebM" title="WebM">WebM</a> containers, such as <code>.mkv</code>, <code>.mka</code> and <code>.webm</code> files.<sup id="cite_ref-Android_Developers_76-0" class="reference"><a href="#cite_note-Android_Developers-76"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-android_opus_bug_77-0" class="reference"><a href="#cite_note-android_opus_bug-77"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Android_Nougat" title="Android Nougat">Android 7.0 "Nougat"</a> introduced support for Opus audio encapsulated in <a href="/wiki/Ogg" title="Ogg">Ogg</a> containers.<sup id="cite_ref-Android-Supported-File-Ext_78-0" class="reference"><a href="#cite_note-Android-Supported-File-Ext-78"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Android_10" title="Android 10">Android 10</a> finally added native support for <code>.opus</code> <a href="/wiki/Filename_extension" title="Filename extension">extensions</a>.<sup id="cite_ref-:0_79-0" class="reference"><a href="#cite_note-:0-79"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup> </p><p>Due to the addition of <a href="/wiki/WebRTC" title="WebRTC">WebRTC</a> support in Apple's <a href="/wiki/WebKit" title="WebKit">WebKit</a> rendering engine, <a href="/wiki/MacOS_High_Sierra" title="MacOS High Sierra">macOS High Sierra</a> and <a href="/wiki/IOS_11" title="IOS 11">iOS 11</a> were released with native playback support for Opus audio encapsulated in <a href="/wiki/Core_Audio_Format" title="Core Audio Format">Core Audio Format</a> containers.<sup id="cite_ref-80" class="reference"><a href="#cite_note-80"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup> <a href="/wiki/MacOS_Sonoma" title="MacOS Sonoma">macOS Sonoma</a> added support for mono and stereo Opus audio encapsulated in MPEG-4 and WebM containers in <a href="/wiki/Safari_(web_browser)" title="Safari (web browser)">Safari</a>.<sup id="cite_ref-safari-17-notes_81-0" class="reference"><a href="#cite_note-safari-17-notes-81"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-webkit-17-blog_82-0" class="reference"><a href="#cite_note-webkit-17-blog-82"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup> </p><p>On <a href="/wiki/Windows_10" title="Windows 10">Windows 10</a>, version <a href="/wiki/Windows_10,_version_1607" title="Windows 10, version 1607">1607</a>, Microsoft provided native support for Opus audio encapsulated in <a href="/wiki/Matroska" title="Matroska">Matroska</a> and <a href="/wiki/WebM" title="WebM">WebM</a> containers.<sup id="cite_ref-83" class="reference"><a href="#cite_note-83"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> On version <a href="/wiki/Windows_10,_version_1709" title="Windows 10, version 1709">1709</a>, support for Opus audio encapsulated in <a href="/wiki/Ogg" title="Ogg">Ogg</a> containers was made available through a pre-installed add-on called Web Media Extensions.<sup id="cite_ref-84" class="reference"><a href="#cite_note-84"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> On Windows 10 version <a href="/wiki/Windows_10,_version_1903" title="Windows 10, version 1903">1903</a>, native support for the <code>.opus</code> extension was added.<sup id="cite_ref-:0_79-1" class="reference"><a href="#cite_note-:0-79"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup> On <a href="/wiki/Windows_8.1" title="Windows 8.1">Windows 8.1</a> and older, third-party decoders, such as <a href="/wiki/LAV_Filters" class="mw-redirect" title="LAV Filters">LAV Filters</a>, are available to provide support for the format.<sup id="cite_ref-lavfilters_85-0" class="reference"><a href="#cite_note-lavfilters-85"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> A January 2024 update for Windows 10 & 11 caused File Explorer to freeze up when renaming or deleting Ogg files (including .oga, .ogg, .ogm, .ogv, .ogx, .opus), due to bugs involving the <b>MF Media Source Pack Property Handler</b> shell extension by Microsoft and the <b>Web Media Extensions</b> package in Windows, which were not patched before the Windows Updates were rolled out.<sup id="cite_ref-86" class="reference"><a href="#cite_note-86"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/IOS_17" title="IOS 17">iOS 17</a> includes support for natively encoding and decoding the Opus codec through the operating system's <a href="/w/index.php?title=AudioToolbox&action=edit&redlink=1" class="new" title="AudioToolbox (page does not exist)">AudioToolbox</a> framework. Playback of <a href="/wiki/Ogg" title="Ogg">Ogg</a> files in the <code>.opus</code> container is supported through the <a href="/wiki/Files_(Apple)" title="Files (Apple)">Files</a> application. Opus is additionally supported within the <a href="/wiki/Core_Audio_Format" title="Core Audio Format">Core Audio Format</a> <code>.caf</code> container, the <a href="/wiki/QuickTime" title="QuickTime">QuickTime</a> <code>.mov</code> container, and the <a href="/wiki/ISO_Base_Media_File_Format" class="mw-redirect" title="ISO Base Media File Format">ISOBMFF</a> or <a href="/wiki/MP4_file_format" title="MP4 file format">MP4 file format</a> <code>.mp4</code> container.<sup id="cite_ref-ios-m4a_88-0" class="reference"><a href="#cite_note-ios-m4a-88"><span class="cite-bracket">[</span>note 3<span class="cite-bracket">]</span></a></sup> As the AudioToolbox framework is shared with <a href="/wiki/MacOS" title="MacOS">macOS</a>, similar support should be present in both operating systems as they further develop.<sup id="cite_ref-89" class="reference"><a href="#cite_note-89"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable" style="width: 100%;"> <caption>Opus support by different operating systems </caption> <tbody><tr> <th scope="row"> </th> <th><a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Windows</a> </th> <th><a href="/wiki/MacOS" title="MacOS">macOS</a> </th> <th><a href="/wiki/Linux" title="Linux">Linux</a> </th> <th><a href="/wiki/Android_(operating_system)" title="Android (operating system)">Android</a> </th> <th><a href="/wiki/IOS" title="IOS">iOS</a> </th></tr> <tr> <th scope="row">Codec support </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes<br /><b>Partial</b>: Win 10 v1607, 1709, 1809<br /><b>Full</b>: Win 10 v1903 </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes<br /><b>Partial</b>: macOS High Sierra (10.13)<br /><b>Full</b>: macOS Sonoma (14.0) </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes<br /><b>Partial</b>: Android 5, 6, 7<br /><b>Full</b>: Android 10 </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes<br /><b>Partial</b>: iOS 11<br /><b>Full</b>: iOS 17 </td></tr> <tr> <th scope="row">Container support </th> <td><b>On Windows 10 Anniversary Update (1607)</b>:<br /><a href="/wiki/WebM" title="WebM">WebM</a> (.webm is not recognised; requires pseudo extension)<br /><a href="/wiki/Matroska" title="Matroska">Matroska</a> (.mka, .mkv) <p> <b>On Windows 10 Fall Creators Update (1709) with Web Media Extensions add-on</b>:<br /><a href="/wiki/Ogg" title="Ogg">Ogg</a> (.opus is not recognised; requires pseudo extension)<sup id="cite_ref-Supported-File-Ext_91-0" class="reference"><a href="#cite_note-Supported-File-Ext-91"><span class="cite-bracket">[</span>note 4<span class="cite-bracket">]</span></a></sup></p><p> <b>On Windows 10 October 2018 Update (1809)</b>:<br /><a href="/wiki/WebM" title="WebM">WebM</a> (.webm is recognised officially)</p><p> <b>On Windows 10 May 2019 Update (1903)</b>:<br /> <a href="/wiki/Ogg" title="Ogg">Ogg</a> (.opus, .oga, .ogg) (.opus is recognised officially)</p> </td> <td><b>On <a href="/wiki/MacOS_High_Sierra" title="MacOS High Sierra">macOS High Sierra</a></b>:<br /><a href="/wiki/Core_Audio_Format" title="Core Audio Format">Core Audio Format</a> (.caf) <p> <b>On <a href="/wiki/MacOS_Monterey" title="MacOS Monterey">macOS Monterey</a></b>:<br /><a href="/wiki/WebM" title="WebM">WebM</a> (.webm; experimental support)<sup id="cite_ref-92" class="reference"><a href="#cite_note-92"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup></p><p><b>On <a href="/wiki/MacOS_Sonoma" title="MacOS Sonoma">macOS Sonoma</a></b>:<br />mono and stereo MPEG-4 and <a href="/wiki/WebM" title="WebM">WebM</a> (.webm)<sup id="cite_ref-safari-17-notes_81-1" class="reference"><a href="#cite_note-safari-17-notes-81"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-webkit-17-blog_82-1" class="reference"><a href="#cite_note-webkit-17-blog-82"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup></p> </td> <td><a href="/wiki/Ogg" title="Ogg">Ogg</a> (.opus)<br /><a href="/wiki/WebM" title="WebM">WebM</a> (.webm)<br /><a href="/wiki/Matroska" title="Matroska">Matroska</a> (.mka, .mkv)<br /><a href="/wiki/MPEG-TS" class="mw-redirect" title="MPEG-TS">MPEG-TS</a> (.ts) </td> <td><b>On <a href="/wiki/Android_Lollipop" title="Android Lollipop">Android 5</a></b>:<br /><a href="/wiki/WebM" title="WebM">WebM</a> (.webm)<br /><a href="/wiki/Matroska" title="Matroska">Matroska</a> (.mka, .mkv) <p> <b>On <a href="/wiki/Android_Nougat" title="Android Nougat">Android 7</a></b>:<br /><a href="/wiki/Ogg" title="Ogg">Ogg</a> (.oga, .ogg) (.opus is not recognised; requires pseudo extension)<sup id="cite_ref-Supported-File-Ext_91-1" class="reference"><a href="#cite_note-Supported-File-Ext-91"><span class="cite-bracket">[</span>note 4<span class="cite-bracket">]</span></a></sup></p><p> <b>On <a href="/wiki/Android_10" title="Android 10">Android 10</a></b>:<br /> <a href="/wiki/Ogg" title="Ogg">Ogg</a> (.opus, .oga, .ogg) (.opus is recognised officially)<br /><a href="/wiki/MP4" class="mw-redirect" title="MP4">MP4</a> (.mp4) (together with <a href="/wiki/AV1" title="AV1">AV1</a> video)</p> </td> <td><b>On <a href="/wiki/IOS_17" title="IOS 17">iOS 17</a> and later</b>:<br />Supports playback through <a href="/wiki/Files_(Apple)" title="Files (Apple)">Files</a>; supports <a href="/wiki/Ogg" title="Ogg">Ogg</a> as .opus; supported in <a href="/wiki/ISO_Base_Media_File_Format" class="mw-redirect" title="ISO Base Media File Format">MP4</a>, standalone<sup id="cite_ref-ios-m4a_88-1" class="reference"><a href="#cite_note-ios-m4a-88"><span class="cite-bracket">[</span>note 3<span class="cite-bracket">]</span></a></sup> or in combination with any officially supported video codec; standalone and expanded but unofficially supported combinations in <a href="/wiki/QuickTime" title="QuickTime">MOV</a>; standalone support in <a href="/wiki/Core_Audio_Format" title="Core Audio Format">CAF</a> </td></tr> <tr> <th scope="row">Notes </th> <td><p><b>On Windows 10 & <a href="/wiki/Windows_11" title="Windows 11">Windows 11</a></b>:<br />- As of June 2023, <a href="/wiki/Windows_Media_Player_(2022)" title="Windows Media Player (2022)">Windows Media Player (2022)</a> does not support Opus audio tracks that accompany videos in MP4 containers.<sup id="cite_ref-94" class="reference"><a href="#cite_note-94"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup> </p> <p><b>On <a href="/wiki/Windows_10" title="Windows 10">Windows 10</a></b>:<br />- On <a href="/wiki/Anniversary_Update" class="mw-redirect" title="Anniversary Update">Anniversary Update</a> (1607), limited support is available in <a href="/wiki/Microsoft_Edge" title="Microsoft Edge">Microsoft Edge</a> (via <a href="/wiki/Media_Source_Extensions" title="Media Source Extensions">MSE</a> only) and <a href="/wiki/Universal_Windows_Platform" title="Universal Windows Platform">Universal Windows Platform</a> apps. <a href="/wiki/Windows_Media_Player" title="Windows Media Player">Windows Media Player</a> does not support Ogg; only WebM and Matroska.<br />- On <a href="/wiki/April_2018_Update" class="mw-redirect" title="April 2018 Update">April 2018 Update</a> (1803) with <a rel="nofollow" class="external text" href="https://www.microsoft.com/store/productId/9N5TDP8VCMHS">Web Media Extensions</a> preinstalled, Microsoft Edge (EdgeHTML 17) supports Opus audio embedded in <audio> tags.<br />- Up till October 2018 update (1809), the filename extension .opus was not recognised. (substitute with a pseudo file extension such as .m4a)<sup id="cite_ref-Windows-Supported-File-Ext_90-1" class="reference"><a href="#cite_note-Windows-Supported-File-Ext-90"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup></p> <p> <b>On <a href="/wiki/Windows_8.1" title="Windows 8.1">Windows 8.1</a> and older</b>:<br />- Requires installation of a third-party multimedia framework, <a href="/wiki/LAV_Filters" class="mw-redirect" title="LAV Filters">LAV Filters</a>.</p> </td> <td>In Safari 15, Apple added support for Opus audio in WebM containers. Experimental support is only present in macOS.<sup id="cite_ref-95" class="reference"><a href="#cite_note-95"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup><p class="mw-empty-elt"></p> </td> <td>– </td> <td>- Up till Android 9, the filename extension .opus was not recognised (substitute with a pseudo file extension such as .ogg or .m4a)<sup id="cite_ref-Android-Supported-File-Ext_78-2" class="reference"><a href="#cite_note-Android-Supported-File-Ext-78"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> </td> <td>- When originally introduced in iOS 11, only constant bitrate Opus audio in a CAF container was supported. <p> - In Safari 15, Apple added support for Opus audio in WebM containers. However, it is non-functional in iOS 15, as of September 2021.<sup id="cite_ref-96" class="reference"><a href="#cite_note-96"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup></p><p>- In iOS 17, native support for playing variable bitrate multichannel .opus files through <a href="/wiki/Quick_Look" title="Quick Look">Quick Look</a> in the Files app was implemented; the codec is additionally natively supported if encapsulated in ISOBMFF/MP4, CAF, or MOV.</p><p>- As of iOS 17, WebM support is present in Safari, but not Files.</p><p>- Opus can additionally be utilized within MP4 in combination with any video codec supported by the device.</p> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Media_player_support">Media player support</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=18" title="Edit section: Media player support"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>While support in multimedia frameworks automatically enables Opus support in software which is built on top of such frameworks, several applications developers made additional efforts for supporting the Opus audio format in their software. Such support was added to <a href="/wiki/AIMP" title="AIMP">AIMP</a>,<sup id="cite_ref-aimp_97-0" class="reference"><a href="#cite_note-aimp-97"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Amarok_(software)" title="Amarok (software)">Amarok</a>,<sup id="cite_ref-amarok_98-0" class="reference"><a href="#cite_note-amarok-98"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Cmus" title="Cmus">cmus</a>, <a href="/wiki/Music_Player_Daemon" title="Music Player Daemon">Music Player Daemon</a>, <a href="/wiki/Foobar2000" title="Foobar2000">foobar2000</a>,<sup id="cite_ref-foobar2000_99-0" class="reference"><a href="#cite_note-foobar2000-99"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Mpxplay" title="Mpxplay">Mpxplay</a>, <a href="/wiki/MusicBee" title="MusicBee">MusicBee</a>,<sup id="cite_ref-musicbee_100-0" class="reference"><a href="#cite_note-musicbee-100"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup> <a href="/wiki/SMplayer" class="mw-redirect" title="SMplayer">SMplayer</a>, <a href="/wiki/VLC_media_player" title="VLC media player">VLC media player</a>,<sup id="cite_ref-vlc_101-0" class="reference"><a href="#cite_note-vlc-101"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Winamp" title="Winamp">Winamp</a><sup id="cite_ref-winamp_102-0" class="reference"><a href="#cite_note-winamp-102"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/XMPlay" title="XMPlay">XMPlay</a> audio players; <a href="/wiki/Icecast" title="Icecast">Icecast</a>,<sup id="cite_ref-Icecast_103-0" class="reference"><a href="#cite_note-Icecast-103"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Airtime_(software)" title="Airtime (software)">Airtime (software)</a><sup id="cite_ref-AirtimeAddsOpusSupport_104-0" class="reference"><a href="#cite_note-AirtimeAddsOpusSupport-104"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup> audio streaming software; and <a href="/wiki/Asunder_(software)" title="Asunder (software)">Asunder</a> audio CD ripper, <a href="/wiki/CDBurnerXP" title="CDBurnerXP">CDBurnerXP</a> CD burner, FFmpeg, Libav and <a href="/wiki/MediaCoder" title="MediaCoder">MediaCoder</a> media encoding tools. Streaming Icecast radio trials are live since September 2012 and January 2013.<sup id="cite_ref-RadioJackieOpusTrial_105-0" class="reference"><a href="#cite_note-RadioJackieOpusTrial-105"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-AbsRadioOpusTrial_106-0" class="reference"><a href="#cite_note-AbsRadioOpusTrial-106"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup> <a href="/wiki/SteamOS" title="SteamOS">SteamOS</a> uses Opus or Vorbis for streaming audio.<sup id="cite_ref-steamdb_107-0" class="reference"><a href="#cite_note-steamdb-107"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Browser_support">Browser support</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=19" title="Edit section: Browser support"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Opus support is mandatory for <a href="/wiki/WebRTC" title="WebRTC">WebRTC</a> implementations.<sup id="cite_ref-webrtc_108-0" class="reference"><a href="#cite_note-webrtc-108"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup> Opus is supported in <a href="/wiki/Firefox" title="Firefox">Mozilla Firefox</a>,<sup id="cite_ref-gecko_109-0" class="reference"><a href="#cite_note-gecko-109"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Chromium_(web_browser)" title="Chromium (web browser)">Chromium</a> and <a href="/wiki/Google_Chrome" title="Google Chrome">Google Chrome</a>,<sup id="cite_ref-chromium-issue104241_110-0" class="reference"><a href="#cite_note-chromium-issue104241-110"><span class="cite-bracket">[</span>106<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Blink_(browser_engine)" title="Blink (browser engine)">Blink</a>-based <a href="/wiki/Opera_(web_browser)" title="Opera (web browser)">Opera</a>,<sup id="cite_ref-opera_111-0" class="reference"><a href="#cite_note-opera-111"><span class="cite-bracket">[</span>107<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-cnet_112-0" class="reference"><a href="#cite_note-cnet-112"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup> as well as all browsers for <a href="/wiki/Unix-like" title="Unix-like">Unix-like</a> systems relying on <a href="/wiki/GStreamer" title="GStreamer">GStreamer</a> for multimedia formats support. Although <a href="/wiki/Internet_Explorer" title="Internet Explorer">Internet Explorer</a> will not provide Opus playback natively, support for the format is built into the <a href="/wiki/Microsoft_Edge" title="Microsoft Edge">Edge browser</a>, along with <a href="/wiki/VP9" title="VP9">VP9</a>, for full <a href="/wiki/WebM" title="WebM">WebM</a> support.<sup id="cite_ref-113" class="reference"><a href="#cite_note-113"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-MSE_114-0" class="reference"><a href="#cite_note-MSE-114"><span class="cite-bracket">[</span>110<span class="cite-bracket">]</span></a></sup> Safari supports Opus as of iOS 11 and macOS High Sierra.<sup id="cite_ref-webkit_opus_115-0" class="reference"><a href="#cite_note-webkit_opus-115"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="VoIP_support">VoIP support</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=20" title="Edit section: VoIP support"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Due to its abilities, Opus gained early interest from <a href="/wiki/Voice_over_IP" title="Voice over IP">voice over IP</a> (VoIP) software vendors. Several <a href="/wiki/Session_Initiation_Protocol" title="Session Initiation Protocol">SIP</a> clients, including <a href="/wiki/Acrobits_Softphone" class="mw-redirect" title="Acrobits Softphone">Acrobits Softphone</a>, CSipSimple (via additional plug-in), <a href="/wiki/Empathy_(software)" title="Empathy (software)">Empathy</a> (via GStreamer), <a href="/wiki/Jitsi" title="Jitsi">Jitsi</a>,<sup id="cite_ref-xmpp.org-jitsi_116-0" class="reference"><a href="#cite_note-xmpp.org-jitsi-116"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Tuenti" title="Tuenti">Tuenti</a>,<sup id="cite_ref-117" class="reference"><a href="#cite_note-117"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Line2" title="Line2">Line2</a> (currently only on <a href="/wiki/IOS" title="IOS">iOS</a>),<sup id="cite_ref-Line2_118-0" class="reference"><a href="#cite_note-Line2-118"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Linphone" title="Linphone">Linphone</a>,<sup id="cite_ref-Linphone_119-0" class="reference"><a href="#cite_note-Linphone-119"><span class="cite-bracket">[</span>115<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Phoner" title="Phoner">Phoner</a> and <a href="/wiki/PhonerLite" class="mw-redirect" title="PhonerLite">PhonerLite</a>,<sup id="cite_ref-Phoner_120-0" class="reference"><a href="#cite_note-Phoner-120"><span class="cite-bracket">[</span>116<span class="cite-bracket">]</span></a></sup> <a href="/wiki/SFLphone" class="mw-redirect" title="SFLphone">SFLphone</a>,<sup id="cite_ref-SFLphone_121-0" class="reference"><a href="#cite_note-SFLphone-121"><span class="cite-bracket">[</span>117<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Telephone_(application)" title="Telephone (application)">Telephone</a>, <a href="/wiki/Mumble_(software)" title="Mumble (software)">Mumble</a>, <a href="/wiki/Discord_(software)" class="mw-redirect" title="Discord (software)">Discord</a><sup id="cite_ref-What_Features_Does_Discord_Have_11-1" class="reference"><a href="#cite_note-What_Features_Does_Discord_Have-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/TeamSpeak_3" class="mw-redirect" title="TeamSpeak 3">TeamSpeak 3</a> voice chat software also support Opus.<sup id="cite_ref-mumble_122-0" class="reference"><a href="#cite_note-mumble-122"><span class="cite-bracket">[</span>118<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-teamspeak_123-0" class="reference"><a href="#cite_note-teamspeak-123"><span class="cite-bracket">[</span>119<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-teamspeak2_124-0" class="reference"><a href="#cite_note-teamspeak2-124"><span class="cite-bracket">[</span>120<span class="cite-bracket">]</span></a></sup> TrueConf supports Opus in its VoIP products.<sup id="cite_ref-TrueConf_125-0" class="reference"><a href="#cite_note-TrueConf-125"><span class="cite-bracket">[</span>121<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Asterisk_(PBX)" title="Asterisk (PBX)">Asterisk</a> lacked builtin Opus support for legal reasons,<sup id="cite_ref-asterix-patents_126-0" class="reference"><a href="#cite_note-asterix-patents-126"><span class="cite-bracket">[</span>122<span class="cite-bracket">]</span></a></sup> but a third-party patch was available for download<sup id="cite_ref-asterisk-patch_127-0" class="reference"><a href="#cite_note-asterisk-patch-127"><span class="cite-bracket">[</span>123<span class="cite-bracket">]</span></a></sup> and official support via a <a href="/wiki/Binary_blob" title="Binary blob">binary blob</a> was added in September 2016.<sup id="cite_ref-Opus-for-Asterisk_128-0" class="reference"><a href="#cite_note-Opus-for-Asterisk-128"><span class="cite-bracket">[</span>124<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Tox_(protocol)" title="Tox (protocol)">Tox P2P videoconferencing software</a> uses Opus exclusively.<sup id="cite_ref-tox-opus_129-0" class="reference"><a href="#cite_note-tox-opus-129"><span class="cite-bracket">[</span>125<span class="cite-bracket">]</span></a></sup> Classified-ads distributed messaging app sends raw opus frames inside TLS socket in its VoIP implementation.<sup id="cite_ref-classified-ads_130-0" class="reference"><a href="#cite_note-classified-ads-130"><span class="cite-bracket">[</span>126<span class="cite-bracket">]</span></a></sup> </p><p>Opus is widely used as the <a href="/wiki/Voice_codec" class="mw-redirect" title="Voice codec">voice codec</a> in <a href="/wiki/WhatsApp" title="WhatsApp">WhatsApp</a>,<sup id="cite_ref-Register_12-1" class="reference"><a href="#cite_note-Register-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Hazra_14-1" class="reference"><a href="#cite_note-Hazra-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Srivastava_13-1" class="reference"><a href="#cite_note-Srivastava-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> which has over 1.5<span class="nowrap"> </span>billion users worldwide.<sup id="cite_ref-techcrunch_131-0" class="reference"><a href="#cite_note-techcrunch-131"><span class="cite-bracket">[</span>127<span class="cite-bracket">]</span></a></sup> WhatsApp uses Opus at 8–16 <a href="/wiki/KHz" class="mw-redirect" title="KHz">kHz</a> <a href="/wiki/Sampling_rate" class="mw-redirect" title="Sampling rate">sampling rates</a>,<sup id="cite_ref-Register_12-2" class="reference"><a href="#cite_note-Register-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Srivastava_13-2" class="reference"><a href="#cite_note-Srivastava-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> with the <a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">Real-time Transport Protocol</a> (RTP).<sup id="cite_ref-Hazra_14-2" class="reference"><a href="#cite_note-Hazra-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/PlayStation_4" title="PlayStation 4">PlayStation 4</a> video game console also uses the CELT/Opus codec for its <a href="/wiki/PlayStation_Network" title="PlayStation Network">PlayStation Network</a> system party chat.<sup id="cite_ref-playstation_15-1" class="reference"><a href="#cite_note-playstation-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Source_(game_engine)" title="Source (game engine)">Source Engine</a> uses Opus for its <a href="/wiki/Voice_chat_in_online_gaming" title="Voice chat in online gaming">voice chat</a> system.<sup id="cite_ref-132" class="reference"><a href="#cite_note-132"><span class="cite-bracket">[</span>128<span class="cite-bracket">]</span></a></sup> It is also used in the Zoom videoconferencing app.<sup id="cite_ref-133" class="reference"><a href="#cite_note-133"><span class="cite-bracket">[</span>129<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Hardware">Hardware</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=21" title="Edit section: Hardware"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Since version 3.13, <a href="/wiki/Rockbox" title="Rockbox">Rockbox</a> enables Opus playback on supported <a href="/wiki/Portable_media_players" class="mw-redirect" title="Portable media players">portable media players</a>, including some products from the <a href="/wiki/IPod" title="IPod">iPod</a> series by <a href="/wiki/Apple_Inc." title="Apple Inc.">Apple</a>, devices made by <a href="/wiki/Iriver" class="mw-redirect" title="Iriver">iriver</a>, <a href="/wiki/Archos" title="Archos">Archos</a> and <a href="/wiki/Sandisk" class="mw-redirect" title="Sandisk">Sandisk</a>, and on <a href="/wiki/Android_(operating_system)" title="Android (operating system)">Android</a> devices using "Rockbox as an Application".<sup id="cite_ref-rockbox_v313_134-0" class="reference"><a href="#cite_note-rockbox_v313-134"><span class="cite-bracket">[</span>130<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-RaaA_135-0" class="reference"><a href="#cite_note-RaaA-135"><span class="cite-bracket">[</span>131<span class="cite-bracket">]</span></a></sup> All recent <a href="/wiki/Grandstream" class="mw-redirect" title="Grandstream">Grandstream</a> <a href="/wiki/IP_phone" class="mw-redirect" title="IP phone">IP phones</a> support Opus audio both for encoding and decoding. OBihai OBi1062, OBi1032 and OBi1022 <a href="/wiki/IP_phone" class="mw-redirect" title="IP phone">IP phones</a> all support Opus. Recent BlueSound wireless speakers support Opus playback.<sup id="cite_ref-136" class="reference"><a href="#cite_note-136"><span class="cite-bracket">[</span>132<span class="cite-bracket">]</span></a></sup> Devices running Hiby OS, like the Hiby R3, are capable of decoding Opus files natively. </p><p>Many broadcast IP codecs include Opus such as those manufactured by <a href="/wiki/Comrex" title="Comrex">Comrex</a>, <a href="/wiki/GatesAir" title="GatesAir">GatesAir</a> and Tieline.<sup id="cite_ref-tieline_137-0" class="reference"><a href="#cite_note-tieline-137"><span class="cite-bracket">[</span>133<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/Sony" title="Sony">Sony</a> <a href="/wiki/PlayStation_5" title="PlayStation 5">PlayStation 5</a> supports capturing 1080p and 2160p footage using VP9 video and Opus audio in a WebM container.<sup id="cite_ref-138" class="reference"><a href="#cite_note-138"><span class="cite-bracket">[</span>134<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-139" class="reference"><a href="#cite_note-139"><span class="cite-bracket">[</span>135<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Android_13" title="Android 13">Android 13</a> supports Opus as a bluetooth headphone (A2DP) codec, motivated by its low latency, which is important for head-tracked spatial audio. Google's Pixel Buds Pro supports this A2DP codec.<sup id="cite_ref-140" class="reference"><a href="#cite_note-140"><span class="cite-bracket">[</span>136<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Patent_claims">Patent claims</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=22" title="Edit section: Patent claims"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As an open standard, the algorithms are openly documented, and a <a href="/wiki/Reference_implementation" title="Reference implementation">reference implementation</a> (including the <a href="/wiki/Source_code" title="Source code">source code</a>) is published. <a href="/wiki/Broadcom" title="Broadcom">Broadcom</a> and the Xiph.Org Foundation own <a href="/wiki/Software_patent" title="Software patent">software patents</a> on some of the CELT algorithms, and <a href="/wiki/Skype_Technologies" title="Skype Technologies">Skype Technologies</a>/Microsoft own some on the SILK algorithms; each offers a royalty-free perpetual license for use with Opus, reserving only the right to make use of their patents to defend against infringement suits of third parties. <a href="/wiki/Qualcomm" title="Qualcomm">Qualcomm</a>, <a href="/wiki/Huawei" title="Huawei">Huawei</a>, <a href="/wiki/France_Telecom" class="mw-redirect" title="France Telecom">France Telecom</a>, and <a href="/wiki/Ericsson" title="Ericsson">Ericsson</a> have claimed that their patents may apply, which Xiph's legal counsel denies, and none have pursued any legal action.<sup id="cite_ref-OpusLicense_10-1" class="reference"><a href="#cite_note-OpusLicense-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-osnews_141-0" class="reference"><a href="#cite_note-osnews-141"><span class="cite-bracket">[</span>137<span class="cite-bracket">]</span></a></sup> The Opus license automatically and retroactively terminates for any entity that attempts to file a patent suit. </p> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=23" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text">Unused by default since 1.3.</span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text">Opus cuts audio above 20 kHz, the generally accepted upper limit of the human <a href="/wiki/Hearing_range" title="Hearing range">hearing range</a>.</span> </li> <li id="cite_note-ios-m4a-88"><span class="mw-cite-backlink">^ <a href="#cite_ref-ios-m4a_88-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ios-m4a_88-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">Opus will only work standalone on iOS 17 in ISOBMFF/MP4 if its "major version", the container's "brand", or "ftype", is <i>not</i> "M4A ". iOS expects audio files to use the <code>.m4a</code> extension,<sup id="cite_ref-loc_87-0" class="reference"><a href="#cite_note-loc-87"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup> relegating <code>.mp4</code> to video, so playback will present a blank video track even if none are present within the container. Re-naming a <code>.mp4</code> file to <code>.m4a</code> will work as expected, however.</span> </li> <li id="cite_note-Supported-File-Ext-91"><span class="mw-cite-backlink">^ <a href="#cite_ref-Supported-File-Ext_91-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Supported-File-Ext_91-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">On Android 9 and Microsoft Windows 10 (1809), the <code>.opus</code> filename extension isn't recognized by Android's MediaScanner service and <a href="/wiki/Universal_Windows_Platform" title="Universal Windows Platform">Universal Windows Platform</a> apps. A pseudo extension of another audio format (such as <code>.ogg</code> or <code>.m4a</code>) is required to detect and playback files.<sup id="cite_ref-Android-Supported-File-Ext_78-1" class="reference"><a href="#cite_note-Android-Supported-File-Ext-78"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Windows-Supported-File-Ext_90-0" class="reference"><a href="#cite_note-Windows-Supported-File-Ext-90"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=24" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Citations">Citations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=25" title="Edit section: Citations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-MIME-and-FileExt-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-MIME-and-FileExt_1-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://wiki.xiph.org/MIME_Types_and_File_Extensions">"MIME Types and File Extensions"</a>. <i>XiphWiki</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=XiphWiki&rft.atitle=MIME+Types+and+File+Extensions&rft_id=https%3A%2F%2Fwiki.xiph.org%2FMIME_Types_and_File_Extensions&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-Ogg-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-Ogg_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Ogg_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTerriberryLeeGiles2016" class="citation cs1">Terriberry, Timothy; Lee, Ron; Giles, Ralph (April 2016). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7845#section-9">"Content Type"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7845"><i>Ogg Encapsulation for the Opus Audio Codec</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. p. 30. sec. 9. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC7845">10.17487/RFC7845</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7845">7845</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-04-30</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Content+Type&rft.btitle=Ogg+Encapsulation+for+the+Opus+Audio+Codec&rft.pages=p.-30.-sec.-9&rft.pub=IETF&rft.date=2016-04&rft_id=info%3Adoi%2F10.17487%2FRFC7845&rft.aulast=Terriberry&rft.aufirst=Timothy&rft.au=Lee%2C+Ron&rft.au=Giles%2C+Ralph&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc7845%26%23035%3Bsection-9&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-OpusMIME-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-OpusMIME_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSpittkaVosValin2015" class="citation cs1">Spittka, Julian; Vos, Koen; Valin, Jean-Marc (2015-06-30). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7587#section-6.1">"Opus Media Type Registration"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7587"><i>RTP Payload Format for the Opus Speech and Audio Codec</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. p. 9. sec. 6.1. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC7587">10.17487/RFC7587</a></span>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/2070-1721">2070-1721</a>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7587">7587</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2015-06-30</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Opus+Media+Type+Registration&rft.btitle=RTP+Payload+Format+for+the+Opus+Speech+and+Audio+Codec&rft.pages=p.-9.-sec.-6.1&rft.pub=IETF&rft.date=2015-06-30&rft_id=info%3Adoi%2F10.17487%2FRFC7587&rft.issn=2070-1721&rft.aulast=Spittka&rft.aufirst=Julian&rft.au=Vos%2C+Koen&rft.au=Valin%2C+Jean-Marc&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc7587%26%23035%3Bsection-6.1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-homepage-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-homepage_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-homepage_4-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-homepage_4-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://opus-codec.org/">"Opus Codec"</a>. <i>Opus</i> (Home page). Xiph.org Foundation<span class="reference-accessdate">. Retrieved <span class="nowrap">July 31,</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Opus&rft.atitle=Opus+Codec&rft_id=https%3A%2F%2Fopus-codec.org%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-ars-role-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-ars-role_5-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBright2012" class="citation web cs1">Bright, Peter (2012-09-12). <a rel="nofollow" class="external text" href="https://arstechnica.com/gadgets/2012/09/newly-standardized-opus-audio-codec-fills-every-role-from-online-chat-to-music/">"Newly standardized Opus audio codec fills every role from online chat to music"</a>. <i><a href="/wiki/Ars_Technica" title="Ars Technica">Ars Technica</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">2014-05-28</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Ars+Technica&rft.atitle=Newly+standardized+Opus+audio+codec+fills+every+role+from+online+chat+to+music&rft.date=2012-09-12&rft.aulast=Bright&rft.aufirst=Peter&rft_id=https%3A%2F%2Farstechnica.com%2Fgadgets%2F2012%2F09%2Fnewly-standardized-opus-audio-codec-fills-every-role-from-online-chat-to-music%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-testsummary-6"><span class="mw-cite-backlink">^ <a href="#cite_ref-testsummary_6-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-testsummary_6-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFValinVosSkoglund2013" class="citation news cs1">Valin, Jean-Marc; Vos, Koen; Skoglund, Jan (2013-05-17). Hoene, Christian (ed.). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/draft-ietf-codec-results-03">"Summary of Opus listening test results"</a>. <i>Ietf Datatracker</i>. Internet Engineering Task Force. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210724010424/https://datatracker.ietf.org/doc/html/draft-ietf-codec-results-03">Archived</a> from the original on 2021-07-24<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-07-24</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Ietf+Datatracker&rft.atitle=Summary+of+Opus+listening+test+results&rft.date=2013-05-17&rft.aulast=Valin&rft.aufirst=Jean-Marc&rft.au=Vos%2C+Koen&rft.au=Skoglund%2C+Jan&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-codec-results-03&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-96kListeningTest-7"><span class="mw-cite-backlink">^ <a href="#cite_ref-96kListeningTest_7-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-96kListeningTest_7-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKamedo22014" class="citation web cs1">Kamedo2 (July 2014). <a rel="nofollow" class="external text" href="http://listening-test.coresv.net/results.htm">"Results of the public multiformat listening test"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Results+of+the+public+multiformat+listening+test&rft.date=2014-07&rft.au=Kamedo2&rft_id=http%3A%2F%2Flistening-test.coresv.net%2Fresults.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_web" title="Template:Cite web">cite web</a>}}</code>: CS1 maint: numeric names: authors list (<a href="/wiki/Category:CS1_maint:_numeric_names:_authors_list" title="Category:CS1 maint: numeric names: authors list">link</a>)</span></span> </li> <li id="cite_note-ValinAES135-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-ValinAES135_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ValinAES135_8-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJean-Marc_ValinGregory_MaxwellTimothy_B._TerriberryKoen_Vos2013" class="citation web cs1">Jean-Marc Valin; Gregory Maxwell; Timothy B. 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John Wiley & Sons. pp. 187–206 (200). <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2F9781119488330.ch12">10.1002/9781119488330.ch12</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9781119488057" title="Special:BookSources/9781119488057"><bdi>9781119488057</bdi></a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:214034702">214034702</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Smartphone+Triggered+Security+Challenges%3A+Issues%2C+Case+Studies+and+Prevention&rft.btitle=Cyber+Security+in+Parallel+and+Distributed+Computing%3A+Concepts%2C+Techniques%2C+Applications+and+Case+Studies&rft.pages=187-206+%28200%29&rft.pub=John+Wiley+%26+Sons&rft.date=2019&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A214034702%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1002%2F9781119488330.ch12&rft.isbn=9781119488057&rft.aulast=Srivastava&rft.aufirst=Saurabh+Ranjan&rft.au=Dube%2C+Sachin&rft.au=Shrivastaya%2C+Gulshan&rft.au=Sharma%2C+Kavita&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DFzGtDwAAQBAJ%26pg%3DPA200&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span> <span class="cs1-visible-error citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_book" title="Template:Cite book">cite book</a>}}</code>: </span><span class="cs1-visible-error citation-comment"><code class="cs1-code">|journal=</code> ignored (<a href="/wiki/Help:CS1_errors#periodical_ignored" title="Help:CS1 errors">help</a>)</span></span> </li> <li id="cite_note-Hazra-14"><span class="mw-cite-backlink">^ <a href="#cite_ref-Hazra_14-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Hazra_14-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Hazra_14-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHazraMateti2017" class="citation book cs1">Hazra, Sudip; Mateti, Prabhaker (September 13–16, 2017). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=1u09DwAAQBAJ&pg=PA290">"Challenges in Android Forensics"</a>. 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Archived from <a rel="nofollow" class="external text" href="http://www.radiomagonline.com/studio_audio/ip_audio/tieline_integrates_opus_report-it_1218/">the original</a> on 2013-05-09<span class="reference-accessdate">. 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As expected, this uses the Opus codec over BT A2DP to minimize latency"</a>. <i>Twitter</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Twitter&rft.atitle=A+firmware+update+is+rolling+out+to+the+Pixel+Buds+Pro+enabling+spatial+audio+with+head+tracking.+As+expected%2C+this+uses+the+Opus+codec+over+BT+A2DP+to+minimize+latency.&rft.aulast=Rahman&rft.aufirst=Mishaal&rft_id=https%3A%2F%2Ftwitter.com%2FMishaalRahman%2Fstatus%2F1633193898725064706&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> <li id="cite_note-osnews-141"><span class="mw-cite-backlink"><b><a href="#cite_ref-osnews_141-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.osnews.com/story/26892/Nokia_s_VP8_patent_claims_we_ve_been_here_before">"Nokia's VP8 patent claims: we've been here before"</a>. OSNews. 2013-05-25<span class="reference-accessdate">. Retrieved <span class="nowrap">2014-07-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Nokia%27s+VP8+patent+claims%3A+we%27ve+been+here+before&rft.pub=OSNews&rft.date=2013-05-25&rft_id=http%3A%2F%2Fwww.osnews.com%2Fstory%2F26892%2FNokia_s_VP8_patent_claims_we_ve_been_here_before&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOpus+%28audio+format%29" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading3"><h3 id="Sources">Sources</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=26" title="Edit section: Sources"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin" style=""> <ul><li><span typeof="mw:File"><a href="/wiki/File:CC_BY_icon.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/CC_BY_icon.svg/50px-CC_BY_icon.svg.png" decoding="async" width="50" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/CC_BY_icon.svg/75px-CC_BY_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/CC_BY_icon.svg/100px-CC_BY_icon.svg.png 2x" data-file-width="88" data-file-height="31" /></a></span> This article contains quotations from the Opus Codec website, which is available under the <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution 3.0 (CC BY 3.0)</a> license.</li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=27" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1235681985"><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <a href="https://commons.wikimedia.org/wiki/Opus" class="extiw" title="commons:Opus"><span style="font-style:italic; font-weight:bold;">Opus</span></a>.</div></div> </div> <ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://opus-codec.org/">Official website</a></span></span></li> <li><a rel="nofollow" class="external text" href="https://wiki.hydrogenaud.io/index.php?title=Opus">Opus on Hydrogenaudio Knowledgebase</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Opus_(audio_format)&action=edit&section=28" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output 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title="Annodex">Annodex</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Media tools</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cdparanoia" title="Cdparanoia">cdparanoia</a></li> <li><a href="/wiki/Icecast" title="Icecast">Icecast</a></li> <li><a href="/wiki/Tremor_(software)" title="Tremor (software)">Tremor</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related articles</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chris_Montgomery" title="Chris Montgomery">Chris Montgomery</a></li> <li><a href="/wiki/Continuous_Media_Markup_Language" title="Continuous Media Markup Language">CMML</a></li> <li><a href="/wiki/Ogg_page" class="mw-redirect" title="Ogg page">Ogg page</a></li> <li><a href="/wiki/Ogg_Squish" title="Ogg Squish">Ogg Squish</a></li> <li><a href="/wiki/Use_of_Ogg_formats_in_HTML5" title="Use of Ogg formats in HTML5">Use of Ogg formats in HTML5</a></li> <li><a href="/wiki/Vorbis_comment" title="Vorbis comment">Vorbis comment</a></li> <li><a href="/wiki/List_of_open-source_codecs" title="List of open-source codecs">List of open-source codecs</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Multimedia_compression_and_container_formats" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Compression_formats" title="Template:Compression formats"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Compression_formats" title="Template talk:Compression formats"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Compression_formats" title="Special:EditPage/Template:Compression formats"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Multimedia_compression_and_container_formats" style="font-size:114%;margin:0 4em"><a href="/wiki/Multimedia" title="Multimedia">Multimedia</a> <a href="/wiki/Data_compression" title="Data compression">compression</a> and <a href="/wiki/Container_format_(computing)" class="mw-redirect" title="Container format (computing)">container</a> formats</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Video_coding_format" title="Video coding format">Video<br />compression</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, <a href="/wiki/International_Electrotechnical_Commission" title="International Electrotechnical Commission">IEC</a>, <br /><a href="/wiki/Moving_Picture_Experts_Group" title="Moving Picture Experts Group">MPEG</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/DV_(video_format)" title="DV (video format)">DV</a></li> <li><a href="/wiki/Motion_JPEG" title="Motion JPEG">MJPEG</a></li> <li><a href="/wiki/Motion_JPEG_2000" title="Motion JPEG 2000">Motion JPEG 2000</a></li> <li><a href="/wiki/MPEG-1" title="MPEG-1">MPEG-1</a></li> <li><a href="/wiki/MPEG-2" title="MPEG-2">MPEG-2</a> <ul><li><a href="/wiki/H.262/MPEG-2_Part_2" title="H.262/MPEG-2 Part 2">Part 2</a></li></ul></li> <li><a href="/wiki/MPEG-4" title="MPEG-4">MPEG-4</a> <ul><li><a href="/wiki/MPEG-4_Part_2" title="MPEG-4 Part 2">Part 2 / ASP</a></li> <li><a href="/wiki/H.264/MPEG-4_AVC" class="mw-redirect" title="H.264/MPEG-4 AVC">Part 10 / AVC</a></li> <li><a href="/wiki/MPEG-4_IVC" class="mw-redirect" title="MPEG-4 IVC">Part 33 / IVC</a></li></ul></li> <li><a href="/wiki/MPEG-H" title="MPEG-H">MPEG-H</a> <ul><li><a href="/wiki/High_Efficiency_Video_Coding" title="High Efficiency Video Coding">Part 2 / HEVC</a></li></ul></li> <li><a href="/w/index.php?title=MPEG-I&action=edit&redlink=1" class="new" title="MPEG-I (page does not exist)">MPEG-I</a> <ul><li><a href="/wiki/Versatile_Video_Coding" title="Versatile Video Coding">Part 3 / VVC</a></li></ul></li> <li><a href="/wiki/MPEG-5" class="mw-redirect" title="MPEG-5">MPEG-5</a> <ul><li><a href="/wiki/Essential_Video_Coding" title="Essential Video Coding">Part 1 / EVC</a></li> <li><a href="/wiki/LCEVC" title="LCEVC">Part 2 / LCEVC</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/ITU-T" title="ITU-T">ITU-T</a>, <a href="/wiki/Video_Coding_Experts_Group" title="Video Coding Experts Group">VCEG</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/H.120" title="H.120">H.120</a></li> <li><a href="/wiki/H.261" title="H.261">H.261</a></li> <li><a href="/wiki/H.262/MPEG-2_Part_2" title="H.262/MPEG-2 Part 2">H.262</a></li> <li><a href="/wiki/H.263" title="H.263">H.263</a></li> <li><a href="/wiki/Advanced_Video_Coding" title="Advanced Video Coding">H.264 / AVC</a></li> <li><a href="/wiki/High_Efficiency_Video_Coding" title="High Efficiency Video Coding">H.265 / HEVC</a></li> <li><a href="/wiki/Versatile_Video_Coding" title="Versatile Video Coding">H.266 / VVC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/Society_of_Motion_Picture_and_Television_Engineers" title="Society of Motion Picture and Television Engineers">SMPTE</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/VC-1" title="VC-1">VC-1</a></li> <li><a href="/wiki/Dirac_(video_compression_format)" title="Dirac (video compression format)">VC-2</a></li> <li><a href="/wiki/Avid_DNxHD" title="Avid DNxHD">VC-3</a></li> <li><a href="/wiki/CineForm" title="CineForm">VC-5</a></li> <li><a href="/wiki/VC-6" title="VC-6">VC-6</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/On2_Technologies" title="On2 Technologies">TrueMotion</a> and AOMedia</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/On2_Technologies#TrueMotion_S" title="On2 Technologies">TrueMotion S</a></li> <li><a href="/wiki/VP3" title="VP3">VP3</a></li> <li><a href="/wiki/VP6" title="VP6">VP6</a></li> <li><a href="/wiki/VP7" class="mw-redirect" title="VP7">VP7</a></li> <li><a href="/wiki/VP8" title="VP8">VP8</a></li> <li><a href="/wiki/VP9" title="VP9">VP9</a></li> <li><a href="/wiki/AV1" title="AV1">AV1</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Chinese Standard</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Audio_Video_Standard#First_generation" title="Audio Video Standard">AVS1 P2/AVS+</a>(GB/T 20090.2/16)</li> <li><a href="/wiki/Audio_Video_Standard#Second_generation" title="Audio Video Standard">AVS2 P2</a>(GB/T 33475.2,GY/T 299.1) <ul><li>HDR Vivid(GY/T 358)</li></ul></li> <li>AVS3 P2(GY/T 368)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Others</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apple_Video" title="Apple Video">Apple Video</a></li> <li><a href="/wiki/Audio_Video_Standard" title="Audio Video Standard">AVS</a></li> <li><a href="/wiki/Bink_Video" title="Bink Video">Bink</a></li> <li><a href="/wiki/Cinepak" title="Cinepak">Cinepak</a></li> <li><a href="/wiki/Daala" title="Daala">Daala</a></li> <li><a href="/wiki/Digital_Video_Interactive" title="Digital Video Interactive">DVI</a></li> <li><a href="/wiki/FFV1" title="FFV1">FFV1</a></li> <li><a href="/wiki/Huffyuv" title="Huffyuv">Huffyuv</a></li> <li><a href="/wiki/Indeo" title="Indeo">Indeo</a></li> <li><a href="/wiki/Lagarith" title="Lagarith">Lagarith</a></li> <li><a href="/wiki/Microsoft_Video_1" title="Microsoft Video 1">Microsoft Video 1</a></li> <li><a href="/wiki/MSU_Lossless_Video_Codec" title="MSU Lossless Video Codec">MSU Lossless</a></li> <li><a href="/wiki/OMS_Video" title="OMS Video">OMS Video</a></li> <li><a href="/wiki/Pixlet" title="Pixlet">Pixlet</a></li> <li><a href="/wiki/Apple_ProRes" title="Apple ProRes">ProRes</a> <ul><li><a href="/wiki/ProRes_422" class="mw-redirect" title="ProRes 422">422</a></li> <li><a href="/wiki/ProRes_4444" class="mw-redirect" title="ProRes 4444">4444</a></li></ul></li> <li>QuickTime <ul><li><a href="/wiki/QuickTime_Animation" title="QuickTime Animation">Animation</a></li> <li><a href="/wiki/QuickTime_Graphics" title="QuickTime Graphics">Graphics</a></li></ul></li> <li><a href="/wiki/RealVideo" title="RealVideo">RealVideo</a></li> <li><a href="/wiki/RTVideo" title="RTVideo">RTVideo</a></li> <li><a href="/wiki/SheerVideo" title="SheerVideo">SheerVideo</a></li> <li><a href="/wiki/Smacker_video" title="Smacker video">Smacker</a></li> <li><a href="/wiki/Sorenson_Media" title="Sorenson Media">Sorenson Video/Spark</a></li> <li><a href="/wiki/Theora" title="Theora">Theora</a></li> <li><a href="/wiki/Thor_(video_codec)" title="Thor (video codec)">Thor</a></li> <li><a href="/wiki/Ut_Video_Codec_Suite" title="Ut Video Codec Suite">Ut</a></li> <li><a href="/wiki/Windows_Media_Video" title="Windows Media Video">WMV</a></li> <li><a href="/wiki/RatDVD" title="RatDVD">XEB</a></li> <li><a href="/wiki/YULS" title="YULS">YULS</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Audio_coding_format" title="Audio coding format">Audio<br />compression</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, <a href="/wiki/International_Electrotechnical_Commission" title="International Electrotechnical Commission">IEC</a>,<br /> <a href="/wiki/Moving_Picture_Experts_Group" title="Moving Picture Experts Group">MPEG</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/MPEG-1_Audio_Layer_II" title="MPEG-1 Audio Layer II">MPEG-1 Layer II</a> <ul><li><a href="/wiki/MPEG_Multichannel" title="MPEG Multichannel">Multichannel</a></li></ul></li> <li><a href="/wiki/MPEG-1_Audio_Layer_I" title="MPEG-1 Audio Layer I">MPEG-1 Layer I</a></li> <li><a href="/wiki/MP3" title="MP3">MPEG-1 Layer III (MP3)</a></li> <li><a href="/wiki/Advanced_Audio_Coding" title="Advanced Audio Coding">AAC</a> <ul><li><a href="/wiki/High-Efficiency_Advanced_Audio_Coding" title="High-Efficiency Advanced Audio Coding">HE-AAC</a></li> <li><a href="/wiki/AAC-LD" title="AAC-LD">AAC-LD</a></li></ul></li> <li><a href="/wiki/MPEG_Surround" title="MPEG Surround">MPEG Surround</a></li> <li><a href="/wiki/Audio_Lossless_Coding" title="Audio Lossless Coding">MPEG-4 ALS</a></li> <li><a href="/wiki/MPEG-4_SLS" title="MPEG-4 SLS">MPEG-4 SLS</a></li> <li><a href="/wiki/Super_Audio_CD#DST" title="Super Audio CD">MPEG-4 DST</a></li> <li><a href="/wiki/Harmonic_Vector_Excitation_Coding" title="Harmonic Vector Excitation Coding">MPEG-4 HVXC</a></li> <li><a href="/wiki/Code-excited_linear_prediction" title="Code-excited linear prediction">MPEG-4 CELP</a></li> <li><a href="/wiki/Unified_Speech_and_Audio_Coding" title="Unified Speech and Audio Coding">MPEG-D USAC</a></li> <li><a href="/wiki/MPEG-H_3D_Audio" title="MPEG-H 3D Audio">MPEG-H 3D Audio</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/ITU-T" title="ITU-T">ITU-T</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/G.711" title="G.711">G.711</a> <ul><li><a href="/wiki/A-law_algorithm" title="A-law algorithm">A-law</a></li> <li><a href="/wiki/%CE%9C-law_algorithm" title="Μ-law algorithm">µ-law</a></li></ul></li> <li><a href="/wiki/G.718" title="G.718">G.718</a></li> <li><a href="/wiki/G.719" title="G.719">G.719</a></li> <li><a href="/wiki/G.722" title="G.722">G.722</a></li> <li><a href="/wiki/G.722.1" title="G.722.1">G.722.1</a></li> <li><a href="/wiki/Adaptive_Multi-Rate_Wideband" title="Adaptive Multi-Rate Wideband">G.722.2</a></li> <li><a href="/wiki/G.723" title="G.723">G.723</a></li> <li><a href="/wiki/G.723.1" title="G.723.1">G.723.1</a></li> <li><a href="/wiki/G.726" title="G.726">G.726</a></li> <li><a href="/wiki/G.728" title="G.728">G.728</a></li> <li><a href="/wiki/G.729" title="G.729">G.729</a></li> <li><a href="/wiki/G.729.1" title="G.729.1">G.729.1</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Opus</a></li> <li><a href="/wiki/Internet_Low_Bitrate_Codec" title="Internet Low Bitrate Codec">iLBC</a></li> <li><a href="/wiki/Speex" title="Speex">Speex</a></li> <li><a href="/wiki/Vorbis" title="Vorbis">Vorbis</a></li> <li><a href="/wiki/FLAC" title="FLAC">FLAC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/3GPP" title="3GPP">3GPP</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Adaptive_Multi-Rate_audio_codec" title="Adaptive Multi-Rate audio codec">AMR</a></li> <li><a href="/wiki/Adaptive_Multi-Rate_Wideband" title="Adaptive Multi-Rate Wideband">AMR-WB</a></li> <li><a href="/wiki/Extended_Adaptive_Multi-Rate_%E2%80%93_Wideband" title="Extended Adaptive Multi-Rate – Wideband">AMR-WB+</a></li> <li><a href="/wiki/Enhanced_Variable_Rate_Codec" title="Enhanced Variable Rate Codec">EVRC</a></li> <li><a href="/wiki/Enhanced_Variable_Rate_Codec_B" title="Enhanced Variable Rate Codec B">EVRC-B</a></li> <li><a href="/wiki/Enhanced_Voice_Services" title="Enhanced Voice Services">EVS</a></li> <li><a href="/wiki/Half_Rate" title="Half Rate">GSM-HR</a></li> <li><a href="/wiki/Full_Rate" title="Full Rate">GSM-FR</a></li> <li><a href="/wiki/Enhanced_full_rate" title="Enhanced full rate">GSM-EFR</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/ETSI" class="mw-redirect" title="ETSI">ETSI</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dolby_Digital" title="Dolby Digital">AC-3</a></li> <li><a href="/wiki/Dolby_AC-4" title="Dolby AC-4">AC-4</a></li> <li><a href="/wiki/DTS_(sound_system)" class="mw-redirect" title="DTS (sound system)">DTS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/Bluetooth_Special_Interest_Group" title="Bluetooth Special Interest Group">Bluetooth SIG</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/SBC_(codec)" title="SBC (codec)">SBC</a></li> <li><a href="/wiki/LC3_(codec)" title="LC3 (codec)">LC3</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Chinese Standard</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Audio_Video_Standard#First_generation" title="Audio Video Standard">AVS1 P10</a>(GB/T 20090.10)</li> <li><a href="/wiki/Audio_Video_Standard#Second_generation" title="Audio Video Standard">AVS2 P3</a>(GB/T 33475.3) <ul><li><a href="/w/index.php?title=Audio_Vivid&action=edit&redlink=1" class="new" title="Audio Vivid (page does not exist)">Audio Vivid</a>(GY/T 363)</li></ul></li> <li><a href="/wiki/Dynamic_Resolution_Adaptation" title="Dynamic Resolution Adaptation">DRA</a>(GB/T 22726)</li> <li><a href="/wiki/L2HC" title="L2HC">L2HC</a></li> <li>ExAC(SJ/T 11299.4)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Others</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Algebraic_code-excited_linear_prediction" title="Algebraic code-excited linear prediction">ACELP</a></li> <li><a href="/wiki/Apple_Lossless_Audio_Codec" title="Apple Lossless Audio Codec">ALAC</a></li> <li><a href="/wiki/Asao_(codec)" title="Asao (codec)">Asao</a></li> <li><a href="/wiki/Adaptive_Transform_Acoustic_Coding" class="mw-redirect" title="Adaptive Transform Acoustic Coding">ATRAC</a></li> <li><a href="/wiki/CELT" title="CELT">CELT</a></li> <li><a href="/wiki/Codec_2" title="Codec 2">Codec 2</a></li> <li><a href="/wiki/Internet_Speech_Audio_Codec" title="Internet Speech Audio Codec">iSAC</a></li> <li><a href="/wiki/Lyra_(codec)" title="Lyra (codec)">Lyra</a></li> <li><a href="/wiki/Mixed-excitation_linear_prediction" title="Mixed-excitation linear prediction">MELP</a></li> <li><a href="/wiki/Monkey%27s_Audio" title="Monkey's Audio">Monkey's Audio</a></li> <li><a href="/wiki/MT9" title="MT9">MT9</a></li> <li><a href="/wiki/Musepack" title="Musepack">Musepack</a></li> <li><a href="/wiki/OptimFROG" title="OptimFROG">OptimFROG</a></li> <li><a href="/wiki/Original_Sound_Quality" title="Original Sound Quality">OSQ</a></li> <li><a href="/wiki/Qualcomm_code-excited_linear_prediction" title="Qualcomm code-excited linear prediction">QCELP</a></li> <li><a href="/wiki/Relaxed_code-excited_linear_prediction" title="Relaxed code-excited linear prediction">RCELP</a></li> <li><a href="/wiki/RealAudio" title="RealAudio">RealAudio</a></li> <li><a href="/wiki/RTAudio" title="RTAudio">RTAudio</a></li> <li><a href="/wiki/Avid_Audio#Sound_Designer_file_formats" title="Avid Audio">SD2</a></li> <li><a href="/wiki/Shorten_file_format" class="mw-redirect" title="Shorten file format">SHN</a></li> <li><a href="/wiki/SILK" title="SILK">SILK</a></li> <li><a href="/wiki/Siren_(codec)" title="Siren (codec)">Siren</a></li> <li><a href="/wiki/Selectable_Mode_Vocoder" title="Selectable Mode Vocoder">SMV</a></li> <li><a href="/wiki/SVOPC" title="SVOPC">SVOPC</a></li> <li>TTA <ul><li>True Audio</li></ul></li> <li><a href="/wiki/TwinVQ" title="TwinVQ">TwinVQ</a></li> <li><a href="/wiki/Variable-Rate_Multimode_Wideband" title="Variable-Rate Multimode Wideband">VMR-WB</a></li> <li><a href="/wiki/Vector_sum_excited_linear_prediction" title="Vector sum excited linear prediction">VSELP</a></li> <li><a href="/wiki/WavPack" title="WavPack">WavPack</a></li> <li><a href="/wiki/Windows_Media_Audio" title="Windows Media Audio">WMA</a></li> <li><a href="/wiki/Master_Quality_Authenticated" title="Master Quality Authenticated">MQA</a></li> <li><a href="/wiki/AptX" title="AptX">aptX</a></li> <li><a href="/wiki/AptX#aptX_HD" title="AptX">aptX HD</a></li> <li><a href="/wiki/AptX#aptX_Low_Latency" title="AptX">aptX Low Latency</a></li> <li><a href="/wiki/AptX#aptX_Adaptive" title="AptX">aptX Adaptive</a></li> <li><a href="/wiki/LDAC_(codec)" title="LDAC (codec)">LDAC</a></li> <li><a href="/wiki/LHDC_(codec)" title="LHDC (codec)">LHDC</a></li> <li><a href="/wiki/LHDC_(codec)#LLAC" title="LHDC (codec)">LLAC</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Image_compression" title="Image compression">Image<br />compression</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/International_Electrotechnical_Commission" title="International Electrotechnical Commission">IEC</a>, <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>, <br /><a href="/wiki/World_Wide_Web_Consortium" title="World Wide Web Consortium">W3C</a>, <a href="/wiki/ITU-T" title="ITU-T">ITU-T</a>, <a href="/wiki/Joint_Photographic_Experts_Group" title="Joint Photographic Experts Group">JPEG</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Group_4_compression" title="Group 4 compression">CCITT Group 4</a></li> <li><a href="/wiki/GIF" title="GIF">GIF</a></li> <li><a href="/wiki/High_Efficiency_Image_File_Format#HEIC:_HEVC_in_HEIF" title="High Efficiency Image File Format">HEIC / HEIF</a></li> <li><a href="/wiki/High_Efficiency_Video_Coding#Main_Still_Picture" title="High Efficiency Video Coding">HEVC</a></li> <li><a href="/wiki/JBIG" title="JBIG">JBIG</a></li> <li><a href="/wiki/JBIG2" title="JBIG2">JBIG2</a></li> <li><a href="/wiki/JPEG" title="JPEG">JPEG</a></li> <li><a href="/wiki/JPEG_2000" title="JPEG 2000">JPEG 2000</a></li> <li><a href="/wiki/JPEG-LS" class="mw-redirect" title="JPEG-LS">JPEG-LS</a></li> <li><a href="/wiki/JPEG_XL" title="JPEG XL">JPEG XL</a></li> <li><a href="/wiki/JPEG_XR" title="JPEG XR">JPEG XR</a></li> <li><a href="/wiki/JPEG_XS" title="JPEG XS">JPEG XS</a></li> <li><a href="/wiki/JPEG_XT" title="JPEG XT">JPEG XT</a></li> <li><a href="/wiki/Portable_Network_Graphics" class="mw-redirect" title="Portable Network Graphics">PNG</a></li> <li><a href="/wiki/TIFF" title="TIFF">TIFF</a></li> <li><a href="/wiki/TIFF/EP" title="TIFF/EP">TIFF/EP</a></li> <li><a href="/wiki/TIFF/IT" class="mw-redirect" title="TIFF/IT">TIFF/IT</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Others</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/APNG" title="APNG">APNG</a></li> <li><a href="/wiki/AV1" title="AV1">AV1</a></li> <li><a href="/wiki/AVIF" title="AVIF">AVIF</a></li> <li><a href="/wiki/Better_Portable_Graphics" title="Better Portable Graphics">BPG</a></li> <li><a href="/wiki/DjVu" title="DjVu">DjVu</a></li> <li><a href="/wiki/OpenEXR" title="OpenEXR">EXR</a></li> <li><a href="/wiki/Free_Lossless_Image_Format" title="Free Lossless Image Format">FLIF</a></li> <li><a href="/wiki/ICER_(file_format)" title="ICER (file format)">ICER</a></li> <li><a href="/wiki/Multiple-image_Network_Graphics" title="Multiple-image Network Graphics">MNG</a></li> <li><a href="/wiki/Progressive_Graphics_File" title="Progressive Graphics File">PGF</a></li> <li><a href="/wiki/QOI_(image_format)" title="QOI (image format)">QOI</a></li> <li><a href="/wiki/QuickTime_VR" title="QuickTime VR">QTVR</a></li> <li><a href="/wiki/Wireless_Application_Protocol_Bitmap_Format" title="Wireless Application Protocol Bitmap Format">WBMP</a></li> <li><a href="/wiki/WebP" title="WebP">WebP</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Digital_container_format" class="mw-redirect" title="Digital container format">Containers</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, <a href="/wiki/International_Electrotechnical_Commission" title="International Electrotechnical Commission">IEC</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/MPEG_elementary_stream" title="MPEG elementary stream">MPEG-ES</a> <ul><li><a href="/wiki/Packetized_elementary_stream" title="Packetized elementary stream">MPEG-PES</a></li></ul></li> <li><a href="/wiki/MPEG_program_stream" title="MPEG program stream">MPEG-PS</a></li> <li><a href="/wiki/MPEG_transport_stream" title="MPEG transport stream">MPEG-TS</a></li> <li><a href="/wiki/ISO/IEC_base_media_file_format" class="mw-redirect" title="ISO/IEC base media file format">ISO/IEC base media file format</a></li> <li><a href="/wiki/MPEG-4_Part_14" class="mw-redirect" title="MPEG-4 Part 14">MPEG-4 Part 14</a> (MP4)</li> <li><a href="/wiki/Motion_JPEG_2000" title="Motion JPEG 2000">Motion JPEG 2000</a></li> <li><a href="/wiki/MPEG-21" title="MPEG-21">MPEG-21 Part 9</a></li> <li><a href="/wiki/MPEG_media_transport" title="MPEG media transport">MPEG media transport</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/ITU-T" title="ITU-T">ITU-T</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/MPEG-2#Systems" title="MPEG-2">H.222.0</a></li> <li><a href="/wiki/Motion_JPEG_2000" title="Motion JPEG 2000">T.802</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">RTP</a></li> <li><a href="/wiki/Ogg" title="Ogg">Ogg</a></li> <li><a href="/wiki/Matroska" title="Matroska">Matroska</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="/wiki/Society_of_Motion_Picture_and_Television_Engineers" title="Society of Motion Picture and Television Engineers">SMPTE</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/General_Exchange_Format" title="General Exchange Format">GXF</a></li> <li><a href="/wiki/Material_Exchange_Format" title="Material Exchange Format">MXF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Others</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/3GP_and_3G2" title="3GP and 3G2">3GP and 3G2</a></li> <li><a href="/wiki/AMV_video_format" title="AMV video format">AMV</a></li> <li><a href="/wiki/Advanced_Systems_Format" title="Advanced Systems Format">ASF</a></li> <li><a href="/wiki/Audio_Interchange_File_Format" title="Audio Interchange File Format">AIFF</a></li> <li><a href="/wiki/Audio_Video_Interleave" title="Audio Video Interleave">AVI</a></li> <li><a href="/wiki/Au_file_format" title="Au file format">AU</a></li> <li><a href="/wiki/Better_Portable_Graphics" title="Better Portable Graphics">BPG</a></li> <li><a href="/wiki/Bink_Video" title="Bink Video">Bink</a> <ul><li><a href="/wiki/Smacker_video" title="Smacker video">Smacker</a></li></ul></li> <li><a href="/wiki/BMP_file_format" title="BMP file format">BMP</a></li> <li><a href="/wiki/DivX#DivX_Media_Format_(DMF)" title="DivX">DivX Media Format</a></li> <li><a href="/wiki/Enhanced_VOB" title="Enhanced VOB">EVO</a></li> <li><a href="/wiki/Flash_Video" title="Flash Video">Flash Video</a></li> <li><a href="/wiki/High_Efficiency_Image_File_Format" title="High Efficiency Image File Format">HEIF</a></li> <li><a href="/wiki/Interchange_File_Format" title="Interchange File Format">IFF</a></li> <li><a href="/wiki/.m2ts" title=".m2ts">M2TS</a></li> <li><a href="/wiki/Matroska" title="Matroska">Matroska</a> <ul><li><a href="/wiki/WebM" title="WebM">WebM</a></li></ul></li> <li><a href="/wiki/QuickTime_File_Format" title="QuickTime File Format">QuickTime File Format</a></li> <li><a href="/wiki/RatDVD" title="RatDVD">RatDVD</a></li> <li><a href="/wiki/RealMedia" title="RealMedia">RealMedia</a></li> <li><a href="/wiki/Resource_Interchange_File_Format" title="Resource Interchange File Format">RIFF</a> <ul><li><a href="/wiki/WAV" title="WAV">WAV</a></li></ul></li> <li><a href="/wiki/MOD_and_TOD" title="MOD and TOD">MOD and TOD</a></li> <li><a href="/wiki/VOB" title="VOB">VOB, IFO and BUP</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Collaborations</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/NETVC" title="NETVC">NETVC</a></li> <li><a href="/wiki/MPEG_LA" title="MPEG LA">MPEG LA</a></li> <li><a href="/wiki/Alliance_for_Open_Media" title="Alliance for Open Media">Alliance for Open Media</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Data_compression" title="Data compression">Methods</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Entropy_encoding" class="mw-redirect" title="Entropy encoding">Entropy</a> <ul><li><a href="/wiki/Arithmetic_coding" title="Arithmetic coding">Arithmetic</a></li> <li><a href="/wiki/Huffman_coding" title="Huffman coding">Huffman</a></li> <li><a href="/wiki/Modified_Huffman_coding" title="Modified Huffman coding">Modified</a></li></ul></li> <li><a href="/wiki/Linear_predictive_coding" title="Linear predictive coding">LPC</a> <ul><li><a href="/wiki/Algebraic_code-excited_linear_prediction" title="Algebraic code-excited linear prediction">ACELP</a></li> <li><a href="/wiki/Code-excited_linear_prediction" title="Code-excited linear prediction">CELP</a></li> <li><a href="/wiki/Line_spectral_pairs" title="Line spectral pairs">LSP</a></li> <li><a href="/wiki/Warped_linear_predictive_coding" title="Warped linear predictive coding">WLPC</a></li></ul></li> <li><a href="/wiki/Lossless_compression" title="Lossless compression">Lossless</a></li> <li><a href="/wiki/Lossy_compression" title="Lossy compression">Lossy</a></li> <li><a href="/wiki/LZ77_and_LZ78" title="LZ77 and LZ78">LZ</a> <ul><li><a href="/wiki/DEFLATE" class="mw-redirect" title="DEFLATE">DEFLATE</a></li> <li><a href="/wiki/Lempel%E2%80%93Ziv%E2%80%93Welch" title="Lempel–Ziv–Welch">LZW</a></li></ul></li> <li><a href="/wiki/Pulse-code_modulation" title="Pulse-code modulation">PCM</a> <ul><li><a href="/wiki/A-law_algorithm" title="A-law algorithm">A-law</a></li> <li><a href="/wiki/%CE%9C-law_algorithm" title="Μ-law algorithm">µ-law</a></li> <li><a href="/wiki/Adaptive_differential_pulse-code_modulation" title="Adaptive differential pulse-code modulation">ADPCM</a></li> <li><a href="/wiki/Differential_pulse-code_modulation" title="Differential pulse-code modulation">DPCM</a></li></ul></li> <li><a href="/wiki/Transform_coding" title="Transform coding">Transforms</a> <ul><li><a href="/wiki/Discrete_cosine_transform" title="Discrete cosine transform">DCT</a></li> <li><a href="/wiki/Fast_Fourier_transform" title="Fast Fourier transform">FFT</a></li> <li><a href="/wiki/Modified_discrete_cosine_transform" title="Modified discrete cosine transform">MDCT</a></li> <li><a href="/wiki/Wavelet" title="Wavelet">Wavelet</a> <ul><li><a href="/wiki/Daubechies_wavelet" title="Daubechies wavelet">Daubechies</a></li> <li><a href="/wiki/Discrete_wavelet_transform" title="Discrete wavelet transform">DWT</a></li></ul></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Lists</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Comparison_of_audio_coding_formats" title="Comparison of audio coding formats">Comparison of audio coding formats</a></li> <li><a href="/wiki/Comparison_of_video_codecs" title="Comparison of video codecs">Comparison of video codecs</a></li> <li><a href="/wiki/List_of_codecs" title="List of codecs">List of codecs</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>See <a href="/wiki/Template:Compression_methods" title="Template:Compression methods">Compression methods</a> for techniques and <a href="/wiki/Template:Compression_software" title="Template:Compression software">Compression software</a> for codecs</div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Data_compression_software" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Compression_software" title="Template:Compression software"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Compression_software" title="Template talk:Compression software"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Compression_software" title="Special:EditPage/Template:Compression software"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Data_compression_software" style="font-size:114%;margin:0 4em"><a href="/wiki/Data_compression" title="Data compression">Data compression</a> software</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Comparison_of_file_archivers" title="Comparison of file archivers">Archivers</a> with<br /> compression<br /> <span style="font-size:85%;">(<a href="/wiki/Comparison_of_file_archivers" title="Comparison of file archivers">comparison</a>)</span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:7em"><a href="/wiki/Free_software" title="Free software">Free software</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/7-Zip" title="7-Zip">7-Zip</a></li> <li><a href="/wiki/Ark_(software)" title="Ark (software)">Ark</a></li> <li><a href="/wiki/Haiku_Applications#Expander" class="mw-redirect" title="Haiku Applications">Expander</a></li> <li><a href="/wiki/FreeArc" title="FreeArc">FreeArc</a></li> <li><a href="/wiki/GNOME_Archive_Manager" class="mw-redirect" title="GNOME Archive Manager">GNOME Archive Manager</a></li> <li><a href="/wiki/Info-ZIP" title="Info-ZIP">Info-ZIP</a></li> <li><a href="/wiki/KGB_Archiver" title="KGB Archiver">KGB Archiver</a></li> <li><a href="/wiki/PAQ" title="PAQ">PAQ</a></li> <li><a href="/wiki/Pax_(command)" title="Pax (command)">pax</a></li> <li><a href="/wiki/PeaZip" title="PeaZip">PeaZip</a></li> <li><a href="/wiki/XAD_(software)" title="XAD (software)">XAD</a> (decompression only)</li> <li><a href="/wiki/Xarchiver" title="Xarchiver">Xarchiver</a></li> <li><a href="/wiki/Zipeg" title="Zipeg">Zipeg</a></li> <li><a href="/wiki/ZPAQ" title="ZPAQ">ZPAQ</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7em"><a href="/wiki/Freeware" title="Freeware">Freeware</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Filzip" title="Filzip">Filzip</a></li> <li><a href="/wiki/LHA_(file_format)" title="LHA (file format)">LHA</a></li> <li><a href="/wiki/Lhasa_(computing)" title="Lhasa (computing)">Lhasa</a> (decompression only)</li> <li><a href="/wiki/StuffIt_Expander" title="StuffIt Expander">StuffIt Expander</a> (decompression only)</li> <li><a href="/wiki/The_Unarchiver" title="The Unarchiver">The Unarchiver</a> (decompression only)</li> <li><a href="/wiki/TUGZip" title="TUGZip">TUGZip</a></li> <li><a href="/wiki/ZipGenius" title="ZipGenius">ZipGenius</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7em"><a href="/wiki/Commercial_software" title="Commercial software">Commercial</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ARC_(file_format)" title="ARC (file format)">ARC</a></li> <li><a href="/wiki/ALZip" title="ALZip">ALZip</a></li> <li><a href="/wiki/Archive_Utility" class="mw-redirect" title="Archive Utility">Archive Utility</a></li> <li><a href="/wiki/ARJ" title="ARJ">ARJ</a></li> <li><a href="/wiki/BetterZip" title="BetterZip">BetterZip</a></li> <li><a href="/wiki/MacBinary" title="MacBinary">MacBinary</a></li> <li><a href="/wiki/PKZIP" title="PKZIP">PKZIP/SecureZIP</a></li> <li><a href="/wiki/PowerArchiver" title="PowerArchiver">PowerArchiver</a></li> <li><a href="/wiki/StuffIt" title="StuffIt">StuffIt</a></li> <li><a href="/wiki/WinAce" title="WinAce">WinAce</a></li> <li><a href="/wiki/WinRAR" title="WinRAR">WinRAR</a></li> <li><a href="/wiki/WinZip" title="WinZip">WinZip</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Non-archiving<br />compressors</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:7em">Generic</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bzip2" title="Bzip2">bzip2</a></li> <li><a href="/wiki/Compress_(software)" title="Compress (software)">compress</a></li> <li><a href="/wiki/Gzip" title="Gzip">gzip</a></li> <li><a href="/wiki/Lzip" title="Lzip">lzip</a></li> <li><a href="/wiki/Lzop" title="Lzop">lzop</a></li> <li><a href="/wiki/Pack_(software)" title="Pack (software)">pack</a></li> <li><a href="/wiki/Rzip" title="Rzip">rzip</a></li> <li><a href="/wiki/Snappy_(compression)" title="Snappy (compression)">Snappy</a></li> <li><a href="/wiki/XZ_Utils" title="XZ Utils">XZ Utils</a></li> <li><a href="/wiki/Zstd" title="Zstd">zstd</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7em"><a href="/wiki/Executable_compression" title="Executable compression">For code</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"><a href="/wiki/UPX" title="UPX">UPX</a></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Data_compression#Audio" title="Data compression">Audio<br /> compression</a><br /> <span style="font-size:85%;">(<a href="/wiki/Comparison_of_audio_coding_formats" title="Comparison of audio coding formats">comparison</a>)</span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:7em;padding-top:5px; padding-bottom:5px"><a href="/wiki/Lossy_compression" title="Lossy compression">Lossy</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Advanced_Audio_Coding" title="Advanced Audio Coding">AAC</a> <ul><li><a href="/wiki/Fraunhofer_FDK_AAC" title="Fraunhofer FDK AAC">Fraunhofer FDK AAC</a></li> <li><a href="/wiki/Nero_AAC_Codec" title="Nero AAC Codec">Nero AAC Codec</a></li> <li><a href="/wiki/FAAC" title="FAAC">FAAC</a></li></ul></li> <li><a href="/wiki/Helix_(multimedia_project)" title="Helix (multimedia project)">Helix DNA Producer</a></li> <li><a href="/wiki/MP3" title="MP3">MP3</a> <ul><li><a href="/wiki/L3enc" title="L3enc">l3enc</a></li> <li><a href="/wiki/LAME" title="LAME">LAME</a></li></ul></li> <li><a href="/wiki/TooLAME" title="TooLAME">TooLAME</a></li> <li><a href="/wiki/Libavcodec" title="Libavcodec">libavcodec</a></li> <li><a href="/wiki/CELT" title="CELT">libcelt</a></li> <li><a class="mw-selflink selflink">libopus</a></li> <li><a href="/wiki/Speex" title="Speex">libspeex</a></li> <li><a href="/wiki/Musepack" title="Musepack">Musepack</a></li> <li><a href="/wiki/Vorbis" title="Vorbis">libvorbis</a></li> <li><a href="/wiki/Windows_Media_Encoder" title="Windows Media Encoder">Windows Media Encoder</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7em;padding-top:5px; padding-bottom:5px"><a href="/wiki/Lossless_compression" title="Lossless compression">Lossless</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apple_Lossless_Audio_Codec" title="Apple Lossless Audio Codec">ALAC</a></li> <li><a href="/wiki/FLAC" title="FLAC">FLAC</a></li> <li><a href="/wiki/Libavcodec" title="Libavcodec">libavcodec</a></li> <li><a href="/wiki/Monkey%27s_Audio" title="Monkey's Audio">Monkey's Audio</a></li> <li><a href="/wiki/Audio_Lossless_Coding" title="Audio Lossless Coding">mp4als</a></li> <li><a href="/wiki/OptimFROG" title="OptimFROG">OptimFROG</a></li> <li><a href="/wiki/Shorten_(codec)" title="Shorten (codec)">Shorten</a></li> <li><a href="/wiki/WavPack" title="WavPack">WavPack</a></li> <li><a href="/wiki/L2HC" title="L2HC">L2HC</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Data_compression#Video" title="Data compression">Video<br /> compression</a><br /> <span style="font-size:85%;">(<a href="/wiki/Comparison_of_video_codecs" title="Comparison of video codecs">comparison</a>)</span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:7em"><a href="/wiki/Lossy_compression" title="Lossy compression">Lossy</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/MPEG-4_Part_2" title="MPEG-4 Part 2">MPEG-4 ASP</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/3ivx" title="3ivx">3ivx</a></li> <li><a href="/wiki/DivX" title="DivX">DivX</a></li> <li><a href="/wiki/Nero_Digital" title="Nero Digital">Nero Digital</a></li> <li><a href="/wiki/FFmpeg" title="FFmpeg">FFmpeg</a></li> <li><a href="/wiki/HDX4" title="HDX4">HDX4</a></li> <li><a href="/wiki/Xvid" title="Xvid">Xvid</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Advanced_Video_Coding" title="Advanced Video Coding">H.264</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/CoreAVC" title="CoreAVC">CoreAVC</a></li> <li>Blu-code</li> <li><a href="/wiki/DivX" title="DivX">DivX</a></li> <li><a href="/wiki/FFmpeg" title="FFmpeg">FFmpeg</a></li> <li><a href="/wiki/Nero_Digital" title="Nero Digital">Nero Digital</a></li> <li><a href="/wiki/OpenH264" title="OpenH264">OpenH264</a></li> <li><a href="/wiki/QuickTime" title="QuickTime">QuickTime</a></li> <li><a href="/wiki/X264" title="X264">x264</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/High_Efficiency_Video_Coding" title="High Efficiency Video Coding">HEVC</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/DivX" title="DivX">DivX</a></li> <li><a href="/wiki/X265" title="X265">x265</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Others</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/CineForm" title="CineForm">CineForm</a></li> <li><a href="/wiki/Cinepak" title="Cinepak">Cinepak</a></li> <li><a href="/wiki/Daala" title="Daala">Daala</a></li> <li><a href="/wiki/Avid_DNxHD" title="Avid DNxHD">DNxHD</a></li> <li><a href="/wiki/Helix_(multimedia_project)" title="Helix (multimedia project)">Helix DNA Producer</a></li> <li><a href="/wiki/Indeo" title="Indeo">Indeo</a></li> <li><a href="/wiki/Libavcodec" title="Libavcodec">libavcodec</a></li> <li><a href="/wiki/Dirac_(video_compression_format)" title="Dirac (video compression format)">Schrödinger (Dirac)</a></li> <li><a href="/wiki/Smart_Bitrate_Control" title="Smart Bitrate Control">SBC</a></li> <li><a href="/wiki/Sorenson_codec" class="mw-redirect" title="Sorenson codec">Sorenson</a></li> <li><a href="/wiki/VP7" class="mw-redirect" title="VP7">VP7</a></li> <li><a href="/wiki/Theora" title="Theora">libtheora</a></li> <li><a href="/wiki/Libvpx" title="Libvpx">libvpx</a></li> <li><a href="/wiki/Windows_Media_Encoder" title="Windows Media Encoder">Windows Media Encoder</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:7em"><a href="/wiki/Lossless_compression" title="Lossless compression">Lossless</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/FFV1" title="FFV1">FFV1</a></li> <li><a href="/wiki/Huffyuv" title="Huffyuv">Huffyuv</a></li> <li><a href="/wiki/Lagarith" title="Lagarith">Lagarith</a></li> <li><a href="/wiki/MSU_Lossless_Video_Codec" title="MSU Lossless Video Codec">MSU Lossless</a></li> <li><a href="/wiki/YULS" title="YULS">YULS</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li>See also: <a href="/wiki/Template:Compression_methods" title="Template:Compression methods">compression methods</a> and <a href="/wiki/Template:Compression_formats" title="Template:Compression formats">compression formats</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Opus_(audio_format)&oldid=1246099610">https://en.wikipedia.org/w/index.php?title=Opus_(audio_format)&oldid=1246099610</a>"</div></div> <div id="catlinks" class="catlinks" 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