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(Click to learn more.)"><span class="icon icon-question-mark "></span></a></div></form></li><li class=" "><a data-locale="de" href="/de/docs/Web/API/HTMLMediaElement/captureStream" class="button submenu-item"><span>Deutsch</span><span title="Diese Übersetzung ist Teil eines Experiments."><span class="icon icon-experimental "></span></span></a></li><li class=" "><a data-locale="fr" href="/fr/docs/Web/API/HTMLMediaElement/captureStream" class="button submenu-item"><span>Français</span></a></li><li class=" "><a data-locale="ja" href="/ja/docs/Web/API/HTMLMediaElement/captureStream" class="button submenu-item"><span>日本語</span></a></li></ul></div></div></li></ul></div></div></div></div><div class="main-wrapper"><div class="sidebar-container"><aside id="sidebar-quicklinks" class="sidebar" data-macro="APIRef"><button type="button" class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/en-US/docs/Web/API/Media_Capture_and_Streams_API">Media Capture and Streams API</a></li><li class="section"><a href="/en-US/docs/Web/API/HTMLMediaElement"><code>HTMLMediaElement</code></a></li><li class="toggle"><details open=""><summary>Instance properties</summary><ol><li><a href="/en-US/docs/Web/API/HTMLMediaElement/audioTracks"><code>audioTracks</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/autoplay"><code>autoplay</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/buffered"><code>buffered</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/controller"><code>controller</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/controls"><code>controls</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/controlsList"><code>controlsList</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/crossOrigin"><code>crossOrigin</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/currentSrc"><code>currentSrc</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/currentTime"><code>currentTime</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/defaultMuted"><code>defaultMuted</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/defaultPlaybackRate"><code>defaultPlaybackRate</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/disableRemotePlayback"><code>disableRemotePlayback</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/duration"><code>duration</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/ended"><code>ended</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/error"><code>error</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/loop"><code>loop</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/mediaGroup"><code>mediaGroup</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/mediaKeys"><code>mediaKeys</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/muted"><code>muted</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/networkState"><code>networkState</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/paused"><code>paused</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/playbackRate"><code>playbackRate</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/preload"><code>preload</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/preservesPitch"><code>preservesPitch</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/readyState"><code>readyState</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/remote"><code>remote</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/seekable"><code>seekable</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/sinkId"><code>sinkId</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/src"><code>src</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/srcObject"><code>srcObject</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/textTracks"><code>textTracks</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/videoTracks"><code>videoTracks</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/volume"><code>volume</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/API/HTMLMediaElement/addTextTrack"><code>addTextTrack()</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/canPlayType"><code>canPlayType()</code></a></li><li><em><code>captureStream()</code> </em></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/fastSeek"><code>fastSeek()</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/load"><code>load()</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/pause"><code>pause()</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/play"><code>play()</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/seekToNextFrame"><code>seekToNextFrame()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/setMediaKeys"><code>setMediaKeys()</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/setSinkId"><code>setSinkId()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Events</summary><ol><li><a href="/en-US/docs/Web/API/HTMLMediaElement/abort_event"><code>abort</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/canplay_event"><code>canplay</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/canplaythrough_event"><code>canplaythrough</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/durationchange_event"><code>durationchange</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/emptied_event"><code>emptied</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/encrypted_event"><code>encrypted</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/ended_event"><code>ended</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/error_event"><code>error</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/loadeddata_event"><code>loadeddata</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/loadedmetadata_event"><code>loadedmetadata</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/loadstart_event"><code>loadstart</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/pause_event"><code>pause</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/play_event"><code>play</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/playing_event"><code>playing</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/progress_event"><code>progress</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/ratechange_event"><code>ratechange</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/seeked_event"><code>seeked</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/seeking_event"><code>seeking</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/stalled_event"><code>stalled</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/suspend_event"><code>suspend</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/timeupdate_event"><code>timeupdate</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/volumechange_event"><code>volumechange</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/waiting_event"><code>waiting</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement/waitingforkey_event"><code>waitingforkey</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Inheritance</summary><ol><li><a href="/en-US/docs/Web/API/HTMLElement"><code>HTMLElement</code></a></li><li><a href="/en-US/docs/Web/API/Element"><code>Element</code></a></li><li><a href="/en-US/docs/Web/API/Node"><code>Node</code></a></li><li><a href="/en-US/docs/Web/API/EventTarget"><code>EventTarget</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Related pages for Media Capture and Streams</summary><ol><li><a href="/en-US/docs/Web/API/CanvasCaptureMediaStreamTrack"><code>CanvasCaptureMediaStreamTrack</code></a></li><li><a href="/en-US/docs/Web/API/HTMLCanvasElement/captureStream"><code>HTMLCanvasElement.captureStream()</code></a></li><li><a href="/en-US/docs/Web/API/InputDeviceInfo"><code>InputDeviceInfo</code></a></li><li><a href="/en-US/docs/Web/API/MediaDeviceInfo"><code>MediaDeviceInfo</code></a></li><li><a href="/en-US/docs/Web/API/MediaDevices"><code>MediaDevices</code></a></li><li><a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a></li><li><a href="/en-US/docs/Web/API/MediaStreamTrack"><code>MediaStreamTrack</code></a></li><li><a href="/en-US/docs/Web/API/MediaStreamTrackEvent"><code>MediaStreamTrackEvent</code></a></li><li><a href="/en-US/docs/Web/API/MediaTrackConstraints"><code>MediaTrackConstraints</code></a></li><li><a href="/en-US/docs/Web/API/MediaTrackSettings"><code>MediaTrackSettings</code></a></li><li><a href="/en-US/docs/Web/API/MediaTrackSupportedConstraints"><code>MediaTrackSupportedConstraints</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/mediaDevices"><code>Navigator.mediaDevices</code></a></li><li><a href="/en-US/docs/Web/API/OverconstrainedError"><code>OverconstrainedError</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="en-US"><header><h1>HTMLMediaElement: captureStream() method</h1><details class="baseline-indicator not"><summary><span class="indicator" role="img" aria-label="Baseline Cross"></span><h2><span class="not-bold">Limited availability</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Not widely supported in Firefox"><span class="browser firefox " role="img" aria-label="Firefox cross"></span></span><span class="engine" title="Not widely supported in Safari"><span class="browser safari " role="img" aria-label="Safari cross"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is not Baseline because it does not work in some of the most widely-used browsers.</p><ul><li><a href="/en-US/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#browser_compatibility" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FAPI%2FHTMLMediaElement%2FcaptureStream&level=not" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p>The <strong><code>captureStream()</code></strong> method of the <a href="/en-US/docs/Web/API/HTMLMediaElement"><code>HTMLMediaElement</code></a> interface returns a <a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a> object which is streaming a real-time capture of the content being rendered in the media element.</p> <p>This can be used, for example, as a source for a <a href="/en-US/docs/Web/API/WebRTC_API">WebRTC</a> <a href="/en-US/docs/Web/API/RTCPeerConnection"><code>RTCPeerConnection</code></a>.</p></div><section aria-labelledby="syntax"><h2 id="syntax"><a href="#syntax">Syntax</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>captureStream() </code></pre></div></div></section><section aria-labelledby="parameters"><h3 id="parameters"><a href="#parameters">Parameters</a></h3><div class="section-content"><p>None.</p></div></section><section aria-labelledby="return_value"><h3 id="return_value"><a href="#return_value">Return value</a></h3><div class="section-content"><p> A <a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a> object which can be used as a source for audio and/or video data by other media processing code, or as a source for <a href="/en-US/docs/Glossary/WebRTC">WebRTC</a>. </p></div></section><section aria-labelledby="examples"><h2 id="examples"><a href="#examples">Examples</a></h2><div class="section-content"><p> In this example, an event handler is established so that clicking a button starts capturing the contents of a media element with the ID <code>"playback"</code> into a <a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a>. The stream can then be used for other purposes—like a source for streaming over WebRTC, to allow sharing prerecorded videos with another person during a video call. </p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>document.querySelector(".playAndRecord").addEventListener("click", () => { const playbackElement = document.getElementById("playback"); const captureStream = playbackElement.captureStream(); playbackElement.play(); }); </code></pre></div> <p>See <a href="/en-US/docs/Web/API/MediaStream_Recording_API/Recording_a_media_element">Recording a media element</a> for a longer and more intricate example and explanation.</p></div></section><h2 id="specifications"><a href="#specifications">Specifications</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://w3c.github.io/mediacapture-fromelement/#dom-htmlmediaelement-capturestream">Media Capture from DOM Elements <br/><small># dom-htmlmediaelement-capturestream</small></a></td></tr></tbody></table><h2 id="browser_compatibility"><a href="#browser_compatibility">Browser compatibility</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="firefox-specific_notes"><h3 id="firefox-specific_notes"><a href="#firefox-specific_notes">Firefox-specific notes</a></h3><div class="section-content"><p> Prior to Firefox 51, you couldn't use <code>captureStream()</code> on a media element whose source is, itself, a <a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a> (like a <a href="/en-US/docs/Web/HTML/Element/video"><code><video></code></a> element which is presenting a stream being received over a <a href="/en-US/docs/Web/API/RTCPeerConnection"><code>RTCPeerConnection</code></a>). Beginning in Firefox 51, this works. This means you can capture a stream from the video element and use <a href="/en-US/docs/Web/API/MediaRecorder"><code>MediaRecorder</code></a> to record it. See <a href="https://bugzil.la/1259788" class="external" target="_blank">Firefox bug 1259788</a> for details. </p> <p> However, <code>captureStream()</code> is still prefixed as <code>mozCaptureStream()</code> on Firefox for good reason: there are some quirks in the present implementation which are worth noting: </p> <ul> <li> The Firefox implementation currently only works as described in the specification when the media element's source is, itself, a <a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a>. </li> <li> If the media element's source isn't a <code>MediaStream</code>, the output from this method isn't compatible with the spec, and if you change the source after starting capture, the output capture stream can't accept the new source data due to that incompatibility, so no <a href="/en-US/docs/Web/API/MediaStreamTrack"><code>MediaStreamTrack</code></a>s from the new source <code>MediaStream</code> are added to the captured stream, resulting in output that doesn't capture the updated source. </li> <li> Switching the source back to a <code>MediaStream</code> adds tracks back to the stream and it works again as expected. </li> <li> Calling <code>mozCaptureMediaStream()</code> on an element with a <code>MediaStream</code> source returns a stream that only contains tracks while the element is playing a <code>MediaStream</code>. </li> <li> If you call <code>mozCaptureMediaStream()</code> on a media element with no source media, its compatibility mode will be based on the first source that's added; for example, if it's a <code>MediaStream</code>, then the capture stream will only work with MediaStream sources from then on. </li> <li> This special behavior will be removed once the non-<code>MediaStream</code> source support is brought up to specification and the method is unprefixed. See <a href="https://bugzil.la/1259788" class="external" target="_blank">Firefox bug 1259788</a> for details. </li> </ul></div></section><section aria-labelledby="see_also"><h2 id="see_also"><a href="#see_also">See also</a></h2><div class="section-content"><ul> <li><a href="/en-US/docs/Web/API/MediaStream_Recording_API/Recording_a_media_element">Recording a media element</a></li> <li><a href="/en-US/docs/Web/API/MediaStream_Recording_API">MediaStream Recording API</a></li> <li><a href="/en-US/docs/Web/API/HTMLCanvasElement/captureStream"><code>HTMLCanvasElement.captureStream()</code></a></li> <li><a href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a></li> <li><a href="/en-US/docs/Web/API/WebRTC_API">WebRTC API</a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" 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Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/controls\"><code>controls</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/controlsList\"><code>controlsList</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/crossOrigin\"><code>crossOrigin</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/currentSrc\"><code>currentSrc</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/currentTime\"><code>currentTime</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/defaultMuted\"><code>defaultMuted</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/defaultPlaybackRate\"><code>defaultPlaybackRate</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/disableRemotePlayback\"><code>disableRemotePlayback</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/duration\"><code>duration</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/ended\"><code>ended</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/error\"><code>error</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/loop\"><code>loop</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/mediaGroup\"><code>mediaGroup</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/mediaKeys\"><code>mediaKeys</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/muted\"><code>muted</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/networkState\"><code>networkState</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/paused\"><code>paused</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/playbackRate\"><code>playbackRate</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/preload\"><code>preload</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/preservesPitch\"><code>preservesPitch</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/readyState\"><code>readyState</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/remote\"><code>remote</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/seekable\"><code>seekable</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/sinkId\"><code>sinkId</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/src\"><code>src</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/srcObject\"><code>srcObject</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/textTracks\"><code>textTracks</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/videoTracks\"><code>videoTracks</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/volume\"><code>volume</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/addTextTrack\"><code>addTextTrack()</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/canPlayType\"><code>canPlayType()</code></a></li><li><em><code>captureStream()</code> </em></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/fastSeek\"><code>fastSeek()</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/load\"><code>load()</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/pause\"><code>pause()</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/play\"><code>play()</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/seekToNextFrame\"><code>seekToNextFrame()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/setMediaKeys\"><code>setMediaKeys()</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/setSinkId\"><code>setSinkId()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Events</summary><ol><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/abort_event\"><code>abort</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/canplay_event\"><code>canplay</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/canplaythrough_event\"><code>canplaythrough</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/durationchange_event\"><code>durationchange</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/emptied_event\"><code>emptied</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/encrypted_event\"><code>encrypted</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/ended_event\"><code>ended</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/error_event\"><code>error</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/loadeddata_event\"><code>loadeddata</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/loadedmetadata_event\"><code>loadedmetadata</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/loadstart_event\"><code>loadstart</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/pause_event\"><code>pause</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/play_event\"><code>play</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/playing_event\"><code>playing</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/progress_event\"><code>progress</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/ratechange_event\"><code>ratechange</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/seeked_event\"><code>seeked</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/seeking_event\"><code>seeking</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/stalled_event\"><code>stalled</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/suspend_event\"><code>suspend</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/timeupdate_event\"><code>timeupdate</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/volumechange_event\"><code>volumechange</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/waiting_event\"><code>waiting</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement/waitingforkey_event\"><code>waitingforkey</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Inheritance</summary><ol><li><a href=\"/en-US/docs/Web/API/HTMLElement\"><code>HTMLElement</code></a></li><li><a href=\"/en-US/docs/Web/API/Element\"><code>Element</code></a></li><li><a href=\"/en-US/docs/Web/API/Node\"><code>Node</code></a></li><li><a href=\"/en-US/docs/Web/API/EventTarget\"><code>EventTarget</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Related pages for Media Capture and Streams</summary><ol><li><a href=\"/en-US/docs/Web/API/CanvasCaptureMediaStreamTrack\"><code>CanvasCaptureMediaStreamTrack</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLCanvasElement/captureStream\"><code>HTMLCanvasElement.captureStream()</code></a></li><li><a href=\"/en-US/docs/Web/API/InputDeviceInfo\"><code>InputDeviceInfo</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaDeviceInfo\"><code>MediaDeviceInfo</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaDevices\"><code>MediaDevices</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaStreamTrack\"><code>MediaStreamTrack</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaStreamTrackEvent\"><code>MediaStreamTrackEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaTrackConstraints\"><code>MediaTrackConstraints</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaTrackSettings\"><code>MediaTrackSettings</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaTrackSupportedConstraints\"><code>MediaTrackSupportedConstraints</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/mediaDevices\"><code>Navigator.mediaDevices</code></a></li><li><a href=\"/en-US/docs/Web/API/OverconstrainedError\"><code>OverconstrainedError</code></a></li></ol></details></li></ol>","sidebarMacro":"APIRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>The <strong><code>captureStream()</code></strong> method of the <a href=\"/en-US/docs/Web/API/HTMLMediaElement\"><code>HTMLMediaElement</code></a> interface returns a <a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a> object which is streaming a real-time capture of the content being rendered in the media element.</p>\n<p>This can be used, for example, as a source for a <a href=\"/en-US/docs/Web/API/WebRTC_API\">WebRTC</a> <a href=\"/en-US/docs/Web/API/RTCPeerConnection\"><code>RTCPeerConnection</code></a>.</p>"}},{"type":"prose","value":{"id":"syntax","title":"Syntax","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>captureStream()\n</code></pre></div>"}},{"type":"prose","value":{"id":"parameters","title":"Parameters","isH3":true,"content":"<p>None.</p>"}},{"type":"prose","value":{"id":"return_value","title":"Return value","isH3":true,"content":"<p>\n A <a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a> object which can be used as a source for audio and/or\n video data by other media processing code, or as a source for <a href=\"/en-US/docs/Glossary/WebRTC\">WebRTC</a>.\n</p>"}},{"type":"prose","value":{"id":"examples","title":"Examples","isH3":false,"content":"<p>\n In this example, an event handler is established so that clicking a button starts\n capturing the contents of a media element with the ID <code>\"playback\"</code> into a\n <a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a>. The stream can then be used for other purposes—like a source\n for streaming over WebRTC, to allow sharing prerecorded videos with another person\n during a video call.\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>document.querySelector(\".playAndRecord\").addEventListener(\"click\", () => {\n const playbackElement = document.getElementById(\"playback\");\n const captureStream = playbackElement.captureStream();\n playbackElement.play();\n});\n</code></pre></div>\n<p>See <a href=\"/en-US/docs/Web/API/MediaStream_Recording_API/Recording_a_media_element\">Recording a media element</a> for a longer and more intricate example and explanation.</p>"}},{"type":"specifications","value":{"title":"Specifications","id":"specifications","isH3":false,"specifications":[{"bcdSpecificationURL":"https://w3c.github.io/mediacapture-fromelement/#dom-htmlmediaelement-capturestream","title":"Media Capture from DOM Elements"}],"query":"api.HTMLMediaElement.captureStream"}},{"type":"browser_compatibility","value":{"title":"Browser compatibility","id":"browser_compatibility","isH3":false,"query":"api.HTMLMediaElement.captureStream"}},{"type":"prose","value":{"id":"firefox-specific_notes","title":"Firefox-specific notes","isH3":true,"content":"<p>\n Prior to Firefox 51, you couldn't use <code>captureStream()</code> on a media element\n whose source is, itself, a <a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a> (like a <a href=\"/en-US/docs/Web/HTML/Element/video\"><code><video></code></a>\n element which is presenting a stream being received over a\n <a href=\"/en-US/docs/Web/API/RTCPeerConnection\"><code>RTCPeerConnection</code></a>). Beginning in Firefox 51, this works. This means you\n can capture a stream from the video element and use <a href=\"/en-US/docs/Web/API/MediaRecorder\"><code>MediaRecorder</code></a> to\n record it. See <a href=\"https://bugzil.la/1259788\" class=\"external\" target=\"_blank\">Firefox bug 1259788</a> for details.\n</p>\n<p>\n However, <code>captureStream()</code> is still prefixed as\n <code>mozCaptureStream()</code> on Firefox for good reason: there are some quirks in the\n present implementation which are worth noting:\n</p>\n<ul>\n <li>\n The Firefox implementation currently only works as described in the specification\n when the media element's source is, itself, a <a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a>.\n </li>\n <li>\n If the media element's source isn't a <code>MediaStream</code>, the output from this\n method isn't compatible with the spec, and if you change the source after starting\n capture, the output capture stream can't accept the new source data due to that\n incompatibility, so no <a href=\"/en-US/docs/Web/API/MediaStreamTrack\"><code>MediaStreamTrack</code></a>s from the new source\n <code>MediaStream</code> are added to the captured stream, resulting in output that\n doesn't capture the updated source.\n </li>\n <li>\n Switching the source back to a <code>MediaStream</code> adds tracks back to the\n stream and it works again as expected.\n </li>\n <li>\n Calling <code>mozCaptureMediaStream()</code> on an element with a\n <code>MediaStream</code> source returns a stream that only contains tracks while the\n element is playing a <code>MediaStream</code>.\n </li>\n <li>\n If you call <code>mozCaptureMediaStream()</code> on a media element with no source\n media, its compatibility mode will be based on the first source that's added; for\n example, if it's a <code>MediaStream</code>, then the capture stream will only work\n with MediaStream sources from then on.\n </li>\n <li>\n This special behavior will be removed once the non-<code>MediaStream</code> source\n support is brought up to specification and the method is unprefixed. See\n <a href=\"https://bugzil.la/1259788\" class=\"external\" target=\"_blank\">Firefox bug 1259788</a> for details.\n </li>\n</ul>"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n <li><a href=\"/en-US/docs/Web/API/MediaStream_Recording_API/Recording_a_media_element\">Recording a media element</a></li>\n <li><a href=\"/en-US/docs/Web/API/MediaStream_Recording_API\">MediaStream Recording API</a></li>\n <li><a href=\"/en-US/docs/Web/API/HTMLCanvasElement/captureStream\"><code>HTMLCanvasElement.captureStream()</code></a></li>\n <li><a href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a></li>\n <li><a href=\"/en-US/docs/Web/API/WebRTC_API\">WebRTC API</a></li>\n</ul>"}}],"toc":[{"text":"Syntax","id":"syntax"},{"text":"Examples","id":"examples"},{"text":"Specifications","id":"specifications"},{"text":"Browser compatibility","id":"browser_compatibility"},{"text":"See also","id":"see_also"}],"summary":"The captureStream() method of the HTMLMediaElement interface returns a MediaStream object which is streaming a real-time capture of the content being rendered in the media element.","popularity":0.0047,"modified":"2023-12-16T12:31:32.000Z","other_translations":[{"locale":"de","title":"HTMLMediaElement: captureStream()-Methode","native":"Deutsch"},{"locale":"fr","title":"HTMLMediaElement.captureStream()","native":"Français"},{"locale":"ja","title":"HTMLMediaElement: captureStream() メソッド","native":"日本語"}],"pageType":"web-api-instance-method","source":{"folder":"en-us/web/api/htmlmediaelement/capturestream","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/api/htmlmediaelement/capturestream/index.md","last_commit_url":"https://github.com/mdn/content/commit/7fb6ccccf88b71712c1b603bed7092dbb622b698","filename":"index.md"},"short_title":"captureStream()","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/API","title":"Web APIs"},{"uri":"/en-US/docs/Web/API/HTMLMediaElement","title":"HTMLMediaElement"},{"uri":"/en-US/docs/Web/API/HTMLMediaElement/captureStream","title":"captureStream()"}],"pageTitle":"HTMLMediaElement: captureStream() method - Web APIs | MDN","noIndexing":false}}</script></body></html>