CINXE.COM

<!doctype html> <html class="client-nojs skin-theme-clientpref-day mf-expand-sections-clientpref-0 mf-font-size-clientpref-small mw-mf-amc-clientpref-0" lang="en" dir="ltr"> <head> <base href="https://en.m.wikipedia.org/wiki/Progressive_download"> <meta charset="UTF-8"> <title>Progressive download - Wikipedia</title> <script>(function(){var className="client-js skin-theme-clientpref-day mf-expand-sections-clientpref-0 mf-font-size-clientpref-small mw-mf-amc-clientpref-0";var cookie=document.cookie.match(/(?:^|; )enwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy","wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"587f5d19-35b6-4213-997b-a1c7f0a73104","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Progressive_download","wgTitle":"Progressive download","wgCurRevisionId":1223316036,"wgRevisionId":1223316036,"wgArticleId" :21478095,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"Progressive_download","wgRelevantArticleId":21478095,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgFlaggedRevsParams":{"tags":{"status":{"levels":1}}},"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFMode":"stable","wgMFAmc":false,"wgMFAmcOutreachActive":false,"wgMFAmcOutreachUserEligible":false,"wgMFLazyLoadImages":true,"wgMFEditNoticesFeatureConflict":false,"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":false,"nearby":true},"wgMFIsSupportedEditRequest":true,"wgMFScriptPath": "","wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":9000,"wgRelatedArticlesCompat":[],"wgEditSubmitButtonLabelPublish":true,"wgSectionTranslationMissingLanguages":[{"lang":"ace","autonym":"Acèh","dir":"ltr"},{"lang":"ady","autonym":"адыгабзэ","dir":"ltr"},{"lang":"alt","autonym":"алтай тил","dir":"ltr"},{"lang":"am","autonym":"አማርኛ","dir":"ltr"},{"lang":"ami","autonym":"Pangcah","dir":"ltr"},{"lang":"an","autonym":"aragonés","dir":"ltr"},{"lang":"ang","autonym":"Ænglisc","dir":"ltr"},{"lang":"ann","autonym":"Obolo","dir":"ltr"},{"lang":"anp","autonym":"अंगिका","dir":"ltr"},{"lang":"ar","autonym":"العربية","dir":"rtl"},{"lang":"ary","autonym":"الدارجة","dir":"rtl"},{"lang":"arz","autonym":"مصرى","dir":"rtl"},{"lang":"as","autonym":"অসমীয়া","dir":"ltr"},{"lang":"ast","autonym":"asturianu","dir":"ltr"},{"lang":"av","autonym":"авар","dir":"ltr"},{"lang":"avk","autonym":"Kotava","dir":"ltr"},{"lang": "awa","autonym":"अवधी","dir":"ltr"},{"lang":"ay","autonym":"Aymar aru","dir":"ltr"},{"lang":"az","autonym":"azərbaycanca","dir":"ltr"},{"lang":"azb","autonym":"تۆرکجه","dir":"rtl"},{"lang":"ba","autonym":"башҡортса","dir":"ltr"},{"lang":"ban","autonym":"Basa Bali","dir":"ltr"},{"lang":"bar","autonym":"Boarisch","dir":"ltr"},{"lang":"bbc","autonym":"Batak Toba","dir":"ltr"},{"lang":"bcl","autonym":"Bikol Central","dir":"ltr"},{"lang":"bdr","autonym":"Bajau Sama","dir":"ltr"},{"lang":"be","autonym":"беларуская","dir":"ltr"},{"lang":"bew","autonym":"Betawi","dir":"ltr"},{"lang":"bg","autonym":"български","dir":"ltr"},{"lang":"bho","autonym":"भोजपुरी","dir":"ltr"},{"lang":"bi","autonym":"Bislama","dir":"ltr"},{"lang":"bjn","autonym":"Banjar","dir":"ltr"},{"lang":"blk","autonym":"ပအိုဝ်ႏဘာႏသာႏ","dir":"ltr"},{"lang":"bm","autonym":"bamanankan","dir":"ltr"},{"lang":"bn","autonym":"বাংলা","dir":"ltr"}, {"lang":"bo","autonym":"བོད་ཡིག","dir":"ltr"},{"lang":"bpy","autonym":"বিষ্ণুপ্রিয়া মণিপুরী","dir":"ltr"},{"lang":"br","autonym":"brezhoneg","dir":"ltr"},{"lang":"bs","autonym":"bosanski","dir":"ltr"},{"lang":"btm","autonym":"Batak Mandailing","dir":"ltr"},{"lang":"bug","autonym":"Basa Ugi","dir":"ltr"},{"lang":"ca","autonym":"català","dir":"ltr"},{"lang":"cdo","autonym":"閩東語 / Mìng-dĕ̤ng-ngṳ̄","dir":"ltr"},{"lang":"ce","autonym":"нохчийн","dir":"ltr"},{"lang":"ceb","autonym":"Cebuano","dir":"ltr"},{"lang":"ch","autonym":"Chamoru","dir":"ltr"},{"lang":"chr","autonym":"ᏣᎳᎩ","dir":"ltr"},{"lang":"ckb","autonym":"کوردی","dir":"rtl"},{"lang":"co","autonym":"corsu","dir":"ltr"},{"lang":"cr","autonym":"Nēhiyawēwin / ᓀᐦᐃᔭᐍᐏᐣ","dir":"ltr"},{"lang":"crh","autonym":"qırımtatarca","dir":"ltr"},{"lang":"cs","autonym":"čeština","dir":"ltr"},{"lang":"cu","autonym": "словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ","dir":"ltr"},{"lang":"cy","autonym":"Cymraeg","dir":"ltr"},{"lang":"da","autonym":"dansk","dir":"ltr"},{"lang":"dag","autonym":"dagbanli","dir":"ltr"},{"lang":"dga","autonym":"Dagaare","dir":"ltr"},{"lang":"din","autonym":"Thuɔŋjäŋ","dir":"ltr"},{"lang":"diq","autonym":"Zazaki","dir":"ltr"},{"lang":"dsb","autonym":"dolnoserbski","dir":"ltr"},{"lang":"dtp","autonym":"Kadazandusun","dir":"ltr"},{"lang":"dv","autonym":"ދިވެހިބަސް","dir":"rtl"},{"lang":"dz","autonym":"ཇོང་ཁ","dir":"ltr"},{"lang":"ee","autonym":"eʋegbe","dir":"ltr"},{"lang":"el","autonym":"Ελληνικά","dir":"ltr"},{"lang":"eml","autonym":"emiliàn e rumagnòl","dir":"ltr"},{"lang":"eo","autonym":"Esperanto","dir":"ltr"},{"lang":"es","autonym":"español","dir":"ltr"},{"lang":"et","autonym":"eesti","dir":"ltr"},{"lang":"eu","autonym":"euskara","dir":"ltr"},{"lang":"fa","autonym":"فارسی","dir":"rtl"},{"lang":"fat","autonym":"mfantse", "dir":"ltr"},{"lang":"ff","autonym":"Fulfulde","dir":"ltr"},{"lang":"fi","autonym":"suomi","dir":"ltr"},{"lang":"fj","autonym":"Na Vosa Vakaviti","dir":"ltr"},{"lang":"fo","autonym":"føroyskt","dir":"ltr"},{"lang":"fon","autonym":"fɔ̀ngbè","dir":"ltr"},{"lang":"fr","autonym":"français","dir":"ltr"},{"lang":"frp","autonym":"arpetan","dir":"ltr"},{"lang":"frr","autonym":"Nordfriisk","dir":"ltr"},{"lang":"fur","autonym":"furlan","dir":"ltr"},{"lang":"fy","autonym":"Frysk","dir":"ltr"},{"lang":"gag","autonym":"Gagauz","dir":"ltr"},{"lang":"gan","autonym":"贛語","dir":"ltr"},{"lang":"gcr","autonym":"kriyòl gwiyannen","dir":"ltr"},{"lang":"gl","autonym":"galego","dir":"ltr"},{"lang":"glk","autonym":"گیلکی","dir":"rtl"},{"lang":"gn","autonym":"Avañe'ẽ","dir":"ltr"},{"lang":"gom","autonym":"गोंयची कोंकणी / Gõychi Konknni","dir":"ltr"},{"lang":"gor","autonym":"Bahasa Hulontalo","dir":"ltr"},{"lang":"gpe","autonym":"Ghanaian Pidgin","dir":"ltr"},{"lang": "gu","autonym":"ગુજરાતી","dir":"ltr"},{"lang":"guc","autonym":"wayuunaiki","dir":"ltr"},{"lang":"gur","autonym":"farefare","dir":"ltr"},{"lang":"guw","autonym":"gungbe","dir":"ltr"},{"lang":"gv","autonym":"Gaelg","dir":"ltr"},{"lang":"ha","autonym":"Hausa","dir":"ltr"},{"lang":"hak","autonym":"客家語 / Hak-kâ-ngî","dir":"ltr"},{"lang":"haw","autonym":"Hawaiʻi","dir":"ltr"},{"lang":"he","autonym":"עברית","dir":"rtl"},{"lang":"hi","autonym":"हिन्दी","dir":"ltr"},{"lang":"hif","autonym":"Fiji Hindi","dir":"ltr"},{"lang":"hr","autonym":"hrvatski","dir":"ltr"},{"lang":"hsb","autonym":"hornjoserbsce","dir":"ltr"},{"lang":"ht","autonym":"Kreyòl ayisyen","dir":"ltr"},{"lang":"hu","autonym":"magyar","dir":"ltr"},{"lang":"hy","autonym":"հայերեն","dir":"ltr"},{"lang":"hyw","autonym":"Արեւմտահայերէն","dir":"ltr"},{"lang":"ia","autonym":"interlingua","dir":"ltr"},{"lang":"iba","autonym":"Jaku Iban","dir":"ltr"},{"lang":"ie","autonym": "Interlingue","dir":"ltr"},{"lang":"ig","autonym":"Igbo","dir":"ltr"},{"lang":"igl","autonym":"Igala","dir":"ltr"},{"lang":"ilo","autonym":"Ilokano","dir":"ltr"},{"lang":"io","autonym":"Ido","dir":"ltr"},{"lang":"is","autonym":"íslenska","dir":"ltr"},{"lang":"it","autonym":"italiano","dir":"ltr"},{"lang":"iu","autonym":"ᐃᓄᒃᑎᑐᑦ / inuktitut","dir":"ltr"},{"lang":"jam","autonym":"Patois","dir":"ltr"},{"lang":"jv","autonym":"Jawa","dir":"ltr"},{"lang":"ka","autonym":"ქართული","dir":"ltr"},{"lang":"kaa","autonym":"Qaraqalpaqsha","dir":"ltr"},{"lang":"kab","autonym":"Taqbaylit","dir":"ltr"},{"lang":"kbd","autonym":"адыгэбзэ","dir":"ltr"},{"lang":"kbp","autonym":"Kabɩyɛ","dir":"ltr"},{"lang":"kcg","autonym":"Tyap","dir":"ltr"},{"lang":"kg","autonym":"Kongo","dir":"ltr"},{"lang":"kge","autonym":"Kumoring","dir":"ltr"},{"lang":"ki","autonym":"Gĩkũyũ","dir":"ltr"},{"lang":"kk","autonym":"қазақша","dir":"ltr"},{"lang":"kl","autonym":"kalaallisut", "dir":"ltr"},{"lang":"km","autonym":"ភាសាខ្មែរ","dir":"ltr"},{"lang":"kn","autonym":"ಕನ್ನಡ","dir":"ltr"},{"lang":"koi","autonym":"перем коми","dir":"ltr"},{"lang":"krc","autonym":"къарачай-малкъар","dir":"ltr"},{"lang":"ks","autonym":"कॉशुर / کٲشُر","dir":"rtl"},{"lang":"ku","autonym":"kurdî","dir":"ltr"},{"lang":"kus","autonym":"Kʋsaal","dir":"ltr"},{"lang":"kv","autonym":"коми","dir":"ltr"},{"lang":"kw","autonym":"kernowek","dir":"ltr"},{"lang":"ky","autonym":"кыргызча","dir":"ltr"},{"lang":"lad","autonym":"Ladino","dir":"ltr"},{"lang":"lb","autonym":"Lëtzebuergesch","dir":"ltr"},{"lang":"lez","autonym":"лезги","dir":"ltr"},{"lang":"lg","autonym":"Luganda","dir":"ltr"},{"lang":"li","autonym":"Limburgs","dir":"ltr"},{"lang":"lij","autonym":"Ligure","dir":"ltr"},{"lang":"lld","autonym":"Ladin","dir":"ltr"},{"lang":"lmo","autonym":"lombard","dir":"ltr"},{"lang":"ln","autonym":"lingála","dir":"ltr"},{ "lang":"lo","autonym":"ລາວ","dir":"ltr"},{"lang":"lt","autonym":"lietuvių","dir":"ltr"},{"lang":"ltg","autonym":"latgaļu","dir":"ltr"},{"lang":"lv","autonym":"latviešu","dir":"ltr"},{"lang":"mad","autonym":"Madhurâ","dir":"ltr"},{"lang":"mai","autonym":"मैथिली","dir":"ltr"},{"lang":"map-bms","autonym":"Basa Banyumasan","dir":"ltr"},{"lang":"mdf","autonym":"мокшень","dir":"ltr"},{"lang":"mg","autonym":"Malagasy","dir":"ltr"},{"lang":"mhr","autonym":"олык марий","dir":"ltr"},{"lang":"mi","autonym":"Māori","dir":"ltr"},{"lang":"min","autonym":"Minangkabau","dir":"ltr"},{"lang":"mk","autonym":"македонски","dir":"ltr"},{"lang":"ml","autonym":"മലയാളം","dir":"ltr"},{"lang":"mn","autonym":"монгол","dir":"ltr"},{"lang":"mni","autonym":"ꯃꯤꯇꯩ ꯂꯣꯟ","dir":"ltr"},{"lang":"mnw","autonym":"ဘာသာမန်","dir":"ltr"},{"lang":"mos","autonym":"moore","dir":"ltr"},{"lang":"mr","autonym":"मराठी","dir":"ltr"} ,{"lang":"mrj","autonym":"кырык мары","dir":"ltr"},{"lang":"ms","autonym":"Bahasa Melayu","dir":"ltr"},{"lang":"mt","autonym":"Malti","dir":"ltr"},{"lang":"mwl","autonym":"Mirandés","dir":"ltr"},{"lang":"my","autonym":"မြန်မာဘာသာ","dir":"ltr"},{"lang":"myv","autonym":"эрзянь","dir":"ltr"},{"lang":"mzn","autonym":"مازِرونی","dir":"rtl"},{"lang":"nah","autonym":"Nāhuatl","dir":"ltr"},{"lang":"nan","autonym":"閩南語 / Bân-lâm-gú","dir":"ltr"},{"lang":"nap","autonym":"Napulitano","dir":"ltr"},{"lang":"nb","autonym":"norsk bokmål","dir":"ltr"},{"lang":"nds","autonym":"Plattdüütsch","dir":"ltr"},{"lang":"nds-nl","autonym":"Nedersaksies","dir":"ltr"},{"lang":"ne","autonym":"नेपाली","dir":"ltr"},{"lang":"new","autonym":"नेपाल भाषा","dir":"ltr"},{"lang":"nia","autonym":"Li Niha","dir":"ltr"},{"lang":"nl","autonym":"Nederlands","dir":"ltr"},{"lang":"nn","autonym":"norsk nynorsk","dir":"ltr"},{"lang":"nqo", "autonym":"ߒߞߏ","dir":"rtl"},{"lang":"nr","autonym":"isiNdebele seSewula","dir":"ltr"},{"lang":"nso","autonym":"Sesotho sa Leboa","dir":"ltr"},{"lang":"ny","autonym":"Chi-Chewa","dir":"ltr"},{"lang":"oc","autonym":"occitan","dir":"ltr"},{"lang":"om","autonym":"Oromoo","dir":"ltr"},{"lang":"or","autonym":"ଓଡ଼ିଆ","dir":"ltr"},{"lang":"os","autonym":"ирон","dir":"ltr"},{"lang":"pa","autonym":"ਪੰਜਾਬੀ","dir":"ltr"},{"lang":"pag","autonym":"Pangasinan","dir":"ltr"},{"lang":"pam","autonym":"Kapampangan","dir":"ltr"},{"lang":"pap","autonym":"Papiamentu","dir":"ltr"},{"lang":"pcd","autonym":"Picard","dir":"ltr"},{"lang":"pcm","autonym":"Naijá","dir":"ltr"},{"lang":"pdc","autonym":"Deitsch","dir":"ltr"},{"lang":"pl","autonym":"polski","dir":"ltr"},{"lang":"pms","autonym":"Piemontèis","dir":"ltr"},{"lang":"pnb","autonym":"پنجابی","dir":"rtl"},{"lang":"ps","autonym":"پښتو","dir":"rtl"},{"lang":"pwn","autonym":"pinayuanan","dir":"ltr"},{"lang":"qu","autonym" :"Runa Simi","dir":"ltr"},{"lang":"rm","autonym":"rumantsch","dir":"ltr"},{"lang":"rn","autonym":"ikirundi","dir":"ltr"},{"lang":"ro","autonym":"română","dir":"ltr"},{"lang":"rsk","autonym":"руски","dir":"ltr"},{"lang":"rue","autonym":"русиньскый","dir":"ltr"},{"lang":"rup","autonym":"armãneashti","dir":"ltr"},{"lang":"rw","autonym":"Ikinyarwanda","dir":"ltr"},{"lang":"sa","autonym":"संस्कृतम्","dir":"ltr"},{"lang":"sah","autonym":"саха тыла","dir":"ltr"},{"lang":"sat","autonym":"ᱥᱟᱱᱛᱟᱲᱤ","dir":"ltr"},{"lang":"sc","autonym":"sardu","dir":"ltr"},{"lang":"scn","autonym":"sicilianu","dir":"ltr"},{"lang":"sco","autonym":"Scots","dir":"ltr"},{"lang":"sd","autonym":"سنڌي","dir":"rtl"},{"lang":"se","autonym":"davvisámegiella","dir":"ltr"},{"lang":"sg","autonym":"Sängö","dir":"ltr"},{"lang":"sgs","autonym":"žemaitėška","dir":"ltr"},{"lang":"sh","autonym":"srpskohrvatski / српскохрватски","dir":"ltr"},{"lang": "shi","autonym":"Taclḥit","dir":"ltr"},{"lang":"shn","autonym":"ၽႃႇသႃႇတႆး ","dir":"ltr"},{"lang":"si","autonym":"සිංහල","dir":"ltr"},{"lang":"sk","autonym":"slovenčina","dir":"ltr"},{"lang":"skr","autonym":"سرائیکی","dir":"rtl"},{"lang":"sl","autonym":"slovenščina","dir":"ltr"},{"lang":"sm","autonym":"Gagana Samoa","dir":"ltr"},{"lang":"smn","autonym":"anarâškielâ","dir":"ltr"},{"lang":"sn","autonym":"chiShona","dir":"ltr"},{"lang":"so","autonym":"Soomaaliga","dir":"ltr"},{"lang":"sq","autonym":"shqip","dir":"ltr"},{"lang":"sr","autonym":"српски / srpski","dir":"ltr"},{"lang":"srn","autonym":"Sranantongo","dir":"ltr"},{"lang":"ss","autonym":"SiSwati","dir":"ltr"},{"lang":"st","autonym":"Sesotho","dir":"ltr"},{"lang":"stq","autonym":"Seeltersk","dir":"ltr"},{"lang":"su","autonym":"Sunda","dir":"ltr"},{"lang":"sv","autonym":"svenska","dir":"ltr"},{"lang":"sw","autonym":"Kiswahili","dir":"ltr"},{"lang":"szl","autonym":"ślůnski","dir": "ltr"},{"lang":"ta","autonym":"தமிழ்","dir":"ltr"},{"lang":"tay","autonym":"Tayal","dir":"ltr"},{"lang":"tcy","autonym":"ತುಳು","dir":"ltr"},{"lang":"tdd","autonym":"ᥖᥭᥰ ᥖᥬᥲ ᥑᥨᥒᥰ","dir":"ltr"},{"lang":"te","autonym":"తెలుగు","dir":"ltr"},{"lang":"tet","autonym":"tetun","dir":"ltr"},{"lang":"tg","autonym":"тоҷикӣ","dir":"ltr"},{"lang":"th","autonym":"ไทย","dir":"ltr"},{"lang":"ti","autonym":"ትግርኛ","dir":"ltr"},{"lang":"tk","autonym":"Türkmençe","dir":"ltr"},{"lang":"tl","autonym":"Tagalog","dir":"ltr"},{"lang":"tly","autonym":"tolışi","dir":"ltr"},{"lang":"tn","autonym":"Setswana","dir":"ltr"},{"lang":"to","autonym":"lea faka-Tonga","dir":"ltr"},{"lang":"tpi","autonym":"Tok Pisin","dir":"ltr"},{"lang":"tr","autonym":"Türkçe","dir":"ltr"},{"lang":"trv","autonym":"Seediq","dir":"ltr"},{"lang":"ts","autonym":"Xitsonga","dir":"ltr"},{"lang":"tt","autonym":"татарча / tatarça","dir":"ltr"},{"lang":"tum", "autonym":"chiTumbuka","dir":"ltr"},{"lang":"tw","autonym":"Twi","dir":"ltr"},{"lang":"ty","autonym":"reo tahiti","dir":"ltr"},{"lang":"tyv","autonym":"тыва дыл","dir":"ltr"},{"lang":"udm","autonym":"удмурт","dir":"ltr"},{"lang":"ur","autonym":"اردو","dir":"rtl"},{"lang":"uz","autonym":"oʻzbekcha / ўзбекча","dir":"ltr"},{"lang":"ve","autonym":"Tshivenda","dir":"ltr"},{"lang":"vec","autonym":"vèneto","dir":"ltr"},{"lang":"vep","autonym":"vepsän kel’","dir":"ltr"},{"lang":"vi","autonym":"Tiếng Việt","dir":"ltr"},{"lang":"vls","autonym":"West-Vlams","dir":"ltr"},{"lang":"vo","autonym":"Volapük","dir":"ltr"},{"lang":"vro","autonym":"võro","dir":"ltr"},{"lang":"wa","autonym":"walon","dir":"ltr"},{"lang":"war","autonym":"Winaray","dir":"ltr"},{"lang":"wo","autonym":"Wolof","dir":"ltr"},{"lang":"wuu","autonym":"吴语","dir":"ltr"},{"lang":"xal","autonym":"хальмг","dir":"ltr"},{"lang":"xh","autonym":"isiXhosa","dir":"ltr"},{"lang":"xmf","autonym": "მარგალური","dir":"ltr"},{"lang":"yi","autonym":"ייִדיש","dir":"rtl"},{"lang":"yo","autonym":"Yorùbá","dir":"ltr"},{"lang":"yue","autonym":"粵語","dir":"ltr"},{"lang":"za","autonym":"Vahcuengh","dir":"ltr"},{"lang":"zgh","autonym":"ⵜⴰⵎⴰⵣⵉⵖⵜ ⵜⴰⵏⴰⵡⴰⵢⵜ","dir":"ltr"},{"lang":"zh","autonym":"中文","dir":"ltr"},{"lang":"zu","autonym":"isiZulu","dir":"ltr"}],"wgSectionTranslationTargetLanguages":["ace","ady","alt","am","ami","an","ang","ann","anp","ar","ary","arz","as","ast","av","avk","awa","ay","az","azb","ba","ban","bar","bbc","bcl","bdr","be","bew","bg","bho","bi","bjn","blk","bm","bn","bo","bpy","br","bs","btm","bug","ca","cdo","ce","ceb","ch","chr","ckb","co","cr","crh","cs","cu","cy","da","dag","de","dga","din","diq","dsb","dtp","dv","dz","ee","el","eml","eo","es","et","eu","fa","fat","ff","fi","fj","fo","fon","fr","frp","frr","fur","fy","gag","gan","gcr","gl","glk","gn","gom","gor","gpe","gu","guc","gur","guw","gv","ha", "hak","haw","he","hi","hif","hr","hsb","ht","hu","hy","hyw","ia","iba","ie","ig","igl","ilo","io","is","it","iu","ja","jam","jv","ka","kaa","kab","kbd","kbp","kcg","kg","kge","ki","kk","kl","km","kn","ko","koi","krc","ks","ku","kus","kv","kw","ky","lad","lb","lez","lg","li","lij","lld","lmo","ln","lo","lt","ltg","lv","mad","mai","map-bms","mdf","mg","mhr","mi","min","mk","ml","mn","mni","mnw","mos","mr","mrj","ms","mt","mwl","my","myv","mzn","nah","nan","nap","nb","nds","nds-nl","ne","new","nia","nl","nn","nqo","nr","nso","ny","oc","om","or","os","pa","pag","pam","pap","pcd","pcm","pdc","pl","pms","pnb","ps","pt","pwn","qu","rm","rn","ro","rsk","rue","rup","rw","sa","sah","sat","sc","scn","sco","sd","se","sg","sgs","sh","shi","shn","si","sk","skr","sl","sm","smn","sn","so","sq","sr","srn","ss","st","stq","su","sv","sw","szl","ta","tay","tcy","tdd","te","tet","tg","th","ti","tk","tl","tly","tn","to","tpi","tr","trv","ts","tt","tum","tw","ty","tyv","udm","ur","uz","ve","vec","vep","vi", "vls","vo","vro","wa","war","wo","wuu","xal","xh","xmf","yi","yo","yue","za","zgh","zh","zu"],"isLanguageSearcherCXEntrypointEnabled":true,"mintEntrypointLanguages":["ace","ast","azb","bcl","bjn","bh","crh","ff","fon","ig","is","ki","ks","lmo","min","sat","ss","tn","vec"],"wgWikibaseItemId":"Q13582265","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false,"wgMinervaPermissions":{"watchable":true,"watch":false},"wgMinervaFeatures":{"beta":false,"donate":true,"mobileOptionsLink":true,"categories":false,"pageIssues":true,"talkAtTop":true,"historyInPageActions":false,"overflowSubmenu":false,"tabsOnSpecials":true,"personalMenu":false,"mainMenuExpanded":false,"echo":true,"nightMode":true},"wgMinervaDownloadNamespaces":[0]};RLSTATE={ "ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","ext.cite.styles":"ready","skins.minerva.styles":"ready","skins.minerva.content.styles.images":"ready","mediawiki.hlist":"ready","skins.minerva.codex.styles":"ready","skins.minerva.icons":"ready","skins.minerva.amc.styles":"ready","ext.wikimediamessages.styles":"ready","mobile.init.styles":"ready","ext.relatedArticles.styles":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["ext.cite.ux-enhancements","site","mediawiki.page.ready","skins.minerva.scripts","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.switcher","ext.urlShortener.toolbar","ext.centralauth.centralautologin","ext.popups","mobile.init","ext.echo.centralauth","ext.relatedArticles.readMore.bootstrap","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.cx.eventlogging.campaigns", "ext.cx.entrypoints.mffrequentlanguages","ext.cx.entrypoints.languagesearcher.init","mw.externalguidance.init","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.cite.styles%7Cext.relatedArticles.styles%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cmediawiki.hlist%7Cmobile.init.styles%7Cskins.minerva.amc.styles%7Cskins.minerva.codex.styles%7Cskins.minerva.content.styles.images%7Cskins.minerva.icons%2Cstyles%7Cwikibase.client.init&only=styles&skin=minerva"> <script async src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=minerva"> <meta name="generator" content="MediaWiki 1.44.0-wmf.5"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta name="theme-color" content="#eaecf0"> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes, minimum-scale=0.25, maximum-scale=5.0"> <meta property="og:title" content="Progressive download - Wikipedia"> <meta property="og:type" content="website"> <link rel="manifest" href="/w/api.php?action=webapp-manifest"> <link rel="alternate" type="application/x-wiki" title="Edit this page" href="/w/index.php?title=Progressive_download&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (en)"> <link rel="EditURI" type="application/rsd+xml" href="//en.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://en.wikipedia.org/wiki/Progressive_download"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en"> <link rel="dns-prefetch" href="//meta.wikimedia.org"> <link rel="dns-prefetch" href="//login.wikimedia.org"> <meta http-equiv="X-Translated-By" content="Google"> <meta http-equiv="X-Translated-To" content="en"> <script type="text/javascript" src="https://www.gstatic.com/_/translate_http/_/js/k=translate_http.tr.en_GB.omlEigW4xY8.O/am=DgY/d=1/rs=AN8SPfpjsL9kUWY0h-sp7Ilu7hZWGwEmeg/m=corsproxy" data-sourceurl="https://en.m.wikipedia.org/wiki/Progressive_download"></script> <link href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200" rel="stylesheet"> <script type="text/javascript" src="https://www.gstatic.com/_/translate_http/_/js/k=translate_http.tr.en_GB.omlEigW4xY8.O/am=DgY/d=1/exm=corsproxy/ed=1/rs=AN8SPfpjsL9kUWY0h-sp7Ilu7hZWGwEmeg/m=phishing_protection" data-phishing-protection-enabled="false" data-forms-warning-enabled="true" data-source-url="https://en.m.wikipedia.org/wiki/Progressive_download"></script> <meta name="robots" content="none"> </head> <body class="mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Progressive_download rootpage-Progressive_download stable issues-group-B skin-minerva action-view skin--responsive mw-mf-amc-disabled mw-mf"> <script type="text/javascript" src="https://www.gstatic.com/_/translate_http/_/js/k=translate_http.tr.en_GB.omlEigW4xY8.O/am=DgY/d=1/exm=corsproxy,phishing_protection/ed=1/rs=AN8SPfpjsL9kUWY0h-sp7Ilu7hZWGwEmeg/m=navigationui" data-environment="prod" data-proxy-url="https://en-m-wikipedia-org.translate.goog" data-proxy-full-url="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-source-url="https://en.m.wikipedia.org/wiki/Progressive_download" data-source-language="auto" data-target-language="en" data-display-language="en-GB" data-detected-source-language="en" data-is-source-untranslated="false" data-source-untranslated-url="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://en.m.wikipedia.org/wiki/Progressive_download&anno=2" data-client="tr"></script> <div id="mw-mf-viewport"> <div id="mw-mf-page-center"><a class="mw-mf-page-center__mask" href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#"></a> <header class="header-container header-chrome"> <div class="minerva-header"> <nav class="navigation-drawer toggle-list view-border-box"><input type="checkbox" id="main-menu-input" class="toggle-list__checkbox" role="button" aria-haspopup="true" aria-expanded="false" aria-labelledby="mw-mf-main-menu-button"> <label role="button" for="main-menu-input" id="mw-mf-main-menu-button" aria-hidden="true" data-event-name="ui.mainmenu" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet toggle-list__toggle"> <span class="minerva-icon minerva-icon--menu"></span> <span></span> </label> <div id="mw-mf-page-left" class="menu view-border-box"> <ul id="p-navigation" class="toggle-list__list"> <li class="toggle-list-item "><a class="toggle-list-item__anchor menu__item--home" href="https://en-m-wikipedia-org.translate.goog/wiki/Main_Page?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-mw="interface"> <span class="minerva-icon minerva-icon--home"></span> <span class="toggle-list-item__label">Home</span> </a></li> <li class="toggle-list-item "><a class="toggle-list-item__anchor menu__item--random" href="https://en-m-wikipedia-org.translate.goog/wiki/Special:Random?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-mw="interface"> <span class="minerva-icon minerva-icon--die"></span> <span class="toggle-list-item__label">Random</span> </a></li> <li class="toggle-list-item skin-minerva-list-item-jsonly"><a class="toggle-list-item__anchor menu__item--nearby" href="https://en-m-wikipedia-org.translate.goog/wiki/Special:Nearby?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-event-name="menu.nearby" data-mw="interface"> <span class="minerva-icon minerva-icon--mapPin"></span> <span class="toggle-list-item__label">Nearby</span> </a></li> </ul> <ul id="p-personal" class="toggle-list__list"> <li class="toggle-list-item "><a class="toggle-list-item__anchor menu__item--login" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Special:UserLogin&returnto=Progressive+download&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-event-name="menu.login" data-mw="interface"> <span class="minerva-icon minerva-icon--logIn"></span> <span class="toggle-list-item__label">Log in</span> </a></li> </ul> <ul id="pt-preferences" class="toggle-list__list"> <li class="toggle-list-item skin-minerva-list-item-jsonly"><a class="toggle-list-item__anchor menu__item--settings" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Special:MobileOptions&returnto=Progressive+download&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-event-name="menu.settings" data-mw="interface"> <span class="minerva-icon minerva-icon--settings"></span> <span class="toggle-list-item__label">Settings</span> </a></li> </ul> <ul id="p-donation" class="toggle-list__list"> <li class="toggle-list-item "><a class="toggle-list-item__anchor menu__item--donate" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source%3Ddonate%26utm_medium%3Dsidebar%26utm_campaign%3DC13_en.wikipedia.org%26uselang%3Den%26wmf_key%3Dminerva" data-event-name="menu.donate" data-mw="interface"> <span class="minerva-icon minerva-icon--heart"></span> <span class="toggle-list-item__label">Donate</span> </a></li> </ul> <ul class="hlist"> <li class="toggle-list-item "><a class="toggle-list-item__anchor menu__item--about" href="https://en-m-wikipedia-org.translate.goog/wiki/Wikipedia:About?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-mw="interface"> <span class="toggle-list-item__label">About Wikipedia</span> </a></li> <li class="toggle-list-item "><a class="toggle-list-item__anchor menu__item--disclaimers" href="https://en-m-wikipedia-org.translate.goog/wiki/Wikipedia:General_disclaimer?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-mw="interface"> <span class="toggle-list-item__label">Disclaimers</span> </a></li> </ul> </div><label class="main-menu-mask" for="main-menu-input"></label> </nav> <div class="branding-box"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Main_Page?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB"> <span><img src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" alt="Wikipedia" width="120" height="18" style="width: 7.5em; height: 1.125em;"> </span> </a> </div> <form action="/w/index.php" method="get" class="minerva-search-form"> <div class="search-box"><input type="hidden" name="title" value="Special:Search"> <input class="search skin-minerva-search-trigger" id="searchInput" type="search" name="search" placeholder="Search Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [f]" accesskey="f"> <span class="search-box-icon-overlay"><span class="minerva-icon minerva-icon--search"></span> </span> </div><button id="searchIcon" class="cdx-button cdx-button--size-large cdx-button--icon-only cdx-button--weight-quiet skin-minerva-search-trigger"> <span class="minerva-icon minerva-icon--search"></span> <span>Search</span> </button> </form> <nav class="minerva-user-navigation" aria-label="User navigation"> </nav> </div> </header> <main id="content" class="mw-body"> <div class="banner-container"> <div id="siteNotice"></div> </div> <div class="pre-content heading-holder"> <div class="page-heading"> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Progressive download</span></h1> <div class="tagline"></div> </div> <ul id="p-associated-pages" class="minerva__tab-container"> <li class="minerva__tab selected"><a class="minerva__tab-text" href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" rel="" data-event-name="tabs.subject">Article</a></li> <li class="minerva__tab "><a class="minerva__tab-text" href="https://en-m-wikipedia-org.translate.goog/wiki/Talk:Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" rel="discussion" data-event-name="tabs.talk">Talk</a></li> </ul> <nav class="page-actions-menu"> <ul id="p-views" class="page-actions-menu__list"> <li id="language-selector" class="page-actions-menu__list-item"><a role="button" href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#p-lang" data-mw="interface" data-event-name="menu.languages" title="Language" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet language-selector"> <span class="minerva-icon minerva-icon--language"></span> <span>Language</span> </a></li> <li id="page-actions-watch" class="page-actions-menu__list-item"><a role="button" id="ca-watch" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Special:UserLogin&returnto=Progressive+download&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-event-name="menu.watch" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet menu__item--page-actions-watch"> <span class="minerva-icon minerva-icon--star"></span> <span>Watch</span> </a></li> <li id="page-actions-edit" class="page-actions-menu__list-item"><a role="button" id="ca-edit" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" data-event-name="menu.edit" data-mw="interface" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet edit-page menu__item--page-actions-edit"> <span class="minerva-icon minerva-icon--edit"></span> <span>Edit</span> </a></li> </ul> </nav> <div id="mw-content-subtitle"></div> </div> <div id="bodyContent" class="content"> <div id="mw-content-text" class="mw-body-content"> <script>function mfTempOpenSection(id){var block=document.getElementById("mf-section-"+id);block.className+=" open-block";block.previousSibling.className+=" open-block";}</script> <div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"> <section class="mf-section-0" id="mf-section-0"> <p>A <b>progressive download</b> is the transfer of <a href="https://en-m-wikipedia-org.translate.goog/wiki/Digital_media?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Digital media">digital media</a> files from a <a href="https://en-m-wikipedia-org.translate.goog/wiki/Web_server?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Web server">server</a> to a <a href="https://en-m-wikipedia-org.translate.goog/wiki/Web_client?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Web client">client</a>, typically using the <a href="https://en-m-wikipedia-org.translate.goog/wiki/HTTP?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="HTTP">HTTP</a> <a href="https://en-m-wikipedia-org.translate.goog/wiki/Protocol_(computing)?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Protocol (computing)">protocol</a> when initiated from a computer. The consumer may begin playback of the media before the download is complete. The key difference between <a href="https://en-m-wikipedia-org.translate.goog/wiki/Streaming_media?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Streaming media">streaming media</a> and progressive download is in how the digital media data is received and stored by the <a href="https://en-m-wikipedia-org.translate.goog/wiki/End_user?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="End user">end user</a> device that is accessing the digital media.</p> <p>A <a href="https://en-m-wikipedia-org.translate.goog/wiki/Media_player_(application_software)?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Media player (application software)">media player</a> that is capable of progressive download playback relies on meta data located in the header of the file to be intact and a local <a href="https://en-m-wikipedia-org.translate.goog/wiki/Buffer_(telecommunication)?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Buffer (telecommunication)">buffer</a> of the digital media file as it is downloaded from a web server. At the point in which a specified amount of data becomes available to the local playback device, the media will begin to play. This specified amount of buffer is embedded into the file by the producer of the content in the <a href="https://en-m-wikipedia-org.translate.goog/wiki/Data_compression?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Data compression">encoder</a> settings and is reinforced by additional buffer settings imposed by the media player.</p> <div id="toc" class="toc" role="navigation" aria-labelledby="mw-toc-heading"> <input type="checkbox" role="button" id="toctogglecheckbox" class="toctogglecheckbox" style="display:none"> <div class="toctitle" lang="en" dir="ltr"> <h2 id="mw-toc-heading">Contents</h2><span class="toctogglespan"><label class="toctogglelabel" for="toctogglecheckbox"></label></span> </div> <ul> <li class="toclevel-1 tocsection-1"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#History"><span class="tocnumber">1</span> <span class="toctext">History</span></a></li> <li class="toclevel-1 tocsection-2"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#HTTP_progressive_download_versus_streaming_media"><span class="tocnumber">2</span> <span class="toctext">HTTP progressive download versus streaming media</span></a></li> <li class="toclevel-1 tocsection-3"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#Optimization_for_HTTP_Pseudo-streaming"><span class="tocnumber">3</span> <span class="toctext">Optimization for HTTP Pseudo-streaming</span></a></li> <li class="toclevel-1 tocsection-4"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#Seeking"><span class="tocnumber">4</span> <span class="toctext">Seeking</span></a></li> <li class="toclevel-1 tocsection-5"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li> <li class="toclevel-1 tocsection-6"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#References"><span class="tocnumber">6</span> <span class="toctext">References</span></a></li> <li class="toclevel-1 tocsection-7"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#External_links"><span class="tocnumber">7</span> <span class="toctext">External links</span></a></li> </ul> </div> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(1)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="History">History</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=1&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: History" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-1 collapsible-block" id="mf-section-1"> <p>Initially the digital media file type known as <a href="https://en-m-wikipedia-org.translate.goog/wiki/JPEG?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="JPEG">JPEG</a> was the first visual media to render a progressive visual display as the digital media was downloaded and actually referred to as a progressive download. The distinction between the technical behavior of progressive download as opposed to the common or commercial use of the term progressive <a href="https://en-m-wikipedia-org.translate.goog/wiki/Download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Download">download</a> to describe that behavior was not documented and there is a good deal of question regarding the origin of the term versus the origin of the technical implementation. <a href="https://en-m-wikipedia-org.translate.goog/wiki/Apple_computer?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Apple computer">Apple</a> in reference to their <a href="https://en-m-wikipedia-org.translate.goog/wiki/QuickTime?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="QuickTime">QuickTime</a> media player employed the term <i>Fast Start</i><sup id="cite_ref-1" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> in 1997, to describe what was commercially referred to as progressive download playback of <a href="https://en-m-wikipedia-org.translate.goog/wiki/Encoding?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Encoding">encoded</a> <a href="https://en-m-wikipedia-org.translate.goog/wiki/Digital_media?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Digital media">digital media</a> content.</p> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(2)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="HTTP_progressive_download_versus_streaming_media">HTTP progressive download versus streaming media</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=2&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: HTTP progressive download versus streaming media" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-2 collapsible-block" id="mf-section-2"> <p>The end user experience is similar to <a href="https://en-m-wikipedia-org.translate.goog/wiki/Streaming_media?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Streaming media">streaming media</a>, however the file is downloaded to a physical drive on the end user's device; the file is typically stored in the <a href="https://en-m-wikipedia-org.translate.goog/wiki/Temporary_directory?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Temporary directory">temporary directory</a> of the associated web browser if the medium was embedded into a web page or is diverted to a storage directory that is set in the preferences of the media player used for playback. The file will stutter or stop playback if the rate of playback exceeds the rate at which the file is downloaded. The file will begin to play again after further download.</p> <p>This fast start playback is the result of moving the meta data from the end of the digital media file to the front, this move of the meta data gave the media player all the information it required to begin playback as the file was still being downloaded. Prior to that change, the meta data summary was located at the end of a media file and the entire file would need to be downloaded in order for the meta data to be read and the player begin playback.<sup id="cite_ref-2" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></p> <p>HTTP Pseudo-streaming (or progressive download), similar to <a href="https://en-m-wikipedia-org.translate.goog/wiki/Streaming_media?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Streaming media">streaming media</a> or <a href="https://en-m-wikipedia-org.translate.goog/wiki/HTTP_Live_Streaming?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="HTTP Live Streaming">HTTP Live Streaming</a>, also supports <a href="https://en-m-wikipedia-org.translate.goog/wiki/Adaptive_bitrate_streaming?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Adaptive bitrate streaming">adaptive bitrate streaming</a>. The disadvantage of HTTP Pseudo-streaming over <a href="https://en-m-wikipedia-org.translate.goog/wiki/Streaming_media?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Streaming media">streaming media</a> is reduced security, since HTTP is easier to <a href="https://en-m-wikipedia-org.translate.goog/wiki/Packet_analyzer?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Packet analyzer">sniff</a> compared to <a href="https://en-m-wikipedia-org.translate.goog/wiki/Real-Time_Messaging_Protocol?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Real-Time Messaging Protocol">RTMP</a>, along with long loading times when seeking larger videos.<sup id="cite_ref-3" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></p> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(3)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="Optimization_for_HTTP_Pseudo-streaming">Optimization for HTTP Pseudo-streaming</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=3&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: Optimization for HTTP Pseudo-streaming" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-3 collapsible-block" id="mf-section-3"> <p>The <a href="https://en-m-wikipedia-org.translate.goog/wiki/MPEG-4_Part_14?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="MPEG-4 Part 14">MP4</a> files consist of <a href="https://en-m-wikipedia-org.translate.goog/wiki/Chunk_(information)?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Chunk (information)">chunks of data</a>, called <b>atoms</b>. These atoms stores information like subtitles, etc. The special atom, called <i>moov atom</i> is responsible for storing information regarding how to play the video like <a href="https://en-m-wikipedia-org.translate.goog/wiki/Display_resolution?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Display resolution">dimensions</a>, <a href="https://en-m-wikipedia-org.translate.goog/wiki/Frame_rate?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Frame rate">frames per second</a> and such which is important to begin playing a video on <a href="https://en-m-wikipedia-org.translate.goog/wiki/HTML_video?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="HTML video">HTML video</a> player.<sup id="cite_ref-r1_4-0" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-r1-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> But atoms can appear in any order, so web servers like <a href="https://en-m-wikipedia-org.translate.goog/wiki/Nginx?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Nginx">Nginx</a> spends some CPU, memory and disk I/O to find the <i>moov atom</i> so that <a href="https://en-m-wikipedia-org.translate.goog/wiki/HTML_video?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="HTML video">HTML video</a> based clients can start playing the video. To optimize for HTTP Pseudo-streaming, it's important to move the <i>moov atom</i> to the beginning, so that web servers like <a href="https://en-m-wikipedia-org.translate.goog/wiki/Nginx?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Nginx">Nginx</a> optimize for faster pseudo-streaming resulting in playing of playbacks without having to wait for the entire file to be arrived or scanned.<sup id="cite_ref-n1_5-0" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-n1-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></p> <p><code> ffmpeg -i sample_input.mp4 -movflags faststart -acodec copy -vcodec copy sample_output.mp4 </code></p> <ul> <li><code> -movflags faststart</code> does the optimization by moving the index (moov atom) to the beginning of the file.<sup id="cite_ref-6" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></li> <li><code> -acodec copy</code> extracts the audio from the input file unaltered.</li> <li><code> -vcodec copy</code> extracts the video from the input file unaltered.</li> </ul> <p>By doing this optimization, we effectively prevent web servers, like <a href="https://en-m-wikipedia-org.translate.goog/wiki/Nginx?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Nginx">nginx</a>, from spending relative amount of computation in finding the moov atom hence increasing the playback performance on <a href="https://en-m-wikipedia-org.translate.goog/wiki/HTML_video?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="HTML video">HTML video</a> based client.<sup id="cite_ref-n1_5-1" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-n1-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-r1_4-1" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-r1-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></p> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(4)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="Seeking">Seeking</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=4&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: Seeking" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-4 collapsible-block" id="mf-section-4"> <p>Initially, the file is played from the beginning. A user may wish to point to a part of the file which haven't been downloaded yet. This capability is called seeking<sup id="cite_ref-7" class="reference"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> and it makes possible to download and start playing any part of the media file. That is often referred to as pseudo-streaming.</p> <p>For <a href="https://en-m-wikipedia-org.translate.goog/wiki/Flash_video?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Flash video">Flash video</a> seeking requires a list of seek points in the media file metadata. These points are offsets in the video (both in seconds and bytes) at which a new key frame starts. A web server or a media server which handles the download, must support seek points in query string of requests for downloading data.</p> <p>For other types of media files such as <a href="https://en-m-wikipedia-org.translate.goog/wiki/MP4?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="MP4">MP4</a> or <a href="https://en-m-wikipedia-org.translate.goog/wiki/Matroska?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Matroska">MKV</a>, web servers must be capable of handling a special offset parameter. The offset parameter name differs for various servers so it must be specified in player settings.</p> <p>Some servers support seeking via additional modules only, they are specified below. Seeking parameter names are written in <i>italic</i>.</p> <table class="wikitable"> <tbody> <tr> <th>Server</th> <th>Flash seeking</th> <th>MP4 seeking</th> </tr> <tr> <td><a href="https://en-m-wikipedia-org.translate.goog/wiki/Apache_HTTP_Server?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Apache HTTP Server">Apache HTTP Server</a></td> <td><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://h264.code-shop.com/trac">mod_h264</a> <i>start</i> <br><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://github.com/osantana/mod_flvx">mod_flvx</a> <i>start</i></td> <td><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://h264.code-shop.com/trac">mod_h264</a> <i>starttime</i></td> </tr> <tr> <td><a href="https://en-m-wikipedia-org.translate.goog/wiki/Lighttpd?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Lighttpd">lighttpd</a></td> <td><i>start</i></td> <td><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://h264.code-shop.com/trac">mod_h264</a> <i>starttime</i></td> </tr> <tr> <td><a href="https://en-m-wikipedia-org.translate.goog/wiki/Nginx?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Nginx">Nginx</a></td> <td><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://nginx.org/en/docs/http/ngx_http_flv_module.html">http_flv_module</a> <i>start</i></td> <td><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://nginx.org/en/docs/http/ngx_http_mp4_module.html">http_mp4_module</a> <i>start</i></td> </tr> <tr> <td><a href="https://en-m-wikipedia-org.translate.goog/wiki/Nimble_Streamer?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Nimble Streamer">Nimble Streamer</a></td> <td><i>start</i></td> <td><i>start</i></td> </tr> </tbody> </table> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(5)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="See_also">See also</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=5&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: See also" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-5 collapsible-block" id="mf-section-5"> <ul> <li><a href="https://en-m-wikipedia-org.translate.goog/wiki/Online_video_platform?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Online video platform">Online video platform</a></li> <li><a href="https://en-m-wikipedia-org.translate.goog/wiki/Video_streaming?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" class="mw-redirect" title="Video streaming">Video streaming</a></li> </ul> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(6)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="References">References</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=6&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: References" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-6 collapsible-block" id="mf-section-6"> <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-1"><span class="mw-cite-backlink"><b><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-1">^</a></b></span> <span class="reference-text"> <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><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://web.archive.org/web/20110706224514/http://sysdoc.doors.ch/APPLE/L29080A_QTSS41_DS.pdf"><i>QuickTime Streaming Server 4.1</i></a> <span class="cs1-format">(PDF)</span>, archived from <a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://sysdoc.doors.ch/APPLE/L29080A_QTSS41_DS.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2011-07-06<span class="reference-accessdate">, retrieved <span class="nowrap">2010-09-21</span></span>, <q>Two methods are commonly used to deliver media over the web for real-time viewing: progressive download (Fast Start) and real-time streaming.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=QuickTime+Streaming+Server+4.1&rft_id=http%3A%2F%2Fsysdoc.doors.ch%2FAPPLE%2FL29080A_QTSS41_DS.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-2">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://www.adobe.com/devnet/video/articles/mp4_movie_atom.html"><i>Understanding the MPEG-4 movie atom</i></a><span class="reference-accessdate">, retrieved <span class="nowrap">2015-07-17</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Understanding+the+MPEG-4+movie+atom&rft_id=http%3A%2F%2Fwww.adobe.com%2Fdevnet%2Fvideo%2Farticles%2Fmp4_movie_atom.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-3">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPeter_Luk" class="citation web cs1">Peter Luk. <a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://staff.ie.cuhk.edu.hk/~sfluk/wordpress/?p%3D2590">"Video Delivery: HTTP Pseudo-Streaming"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Video+Delivery%3A+HTTP+Pseudo-Streaming&rft.au=Peter+Luk&rft_id=https%3A%2F%2Fstaff.ie.cuhk.edu.hk%2F~sfluk%2Fwordpress%2F%3Fp%3D2590&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> <li id="cite_note-r1-4"><span class="mw-cite-backlink">^ <a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-r1_4-0"><sup><i><b>a</b></i></sup></a> <a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-r1_4-1"><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="CITEREFBilly_Hoffman2016" class="citation web cs1">Billy Hoffman (2016). <a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://rigor.com/blog/optimizing-mp4-video-for-fast-streaming/">"Optimizing MP4 Video for faster streaming"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Optimizing+MP4+Video+for+faster+streaming&rft.date=2016&rft.au=Billy+Hoffman&rft_id=https%3A%2F%2Frigor.com%2Fblog%2Foptimizing-mp4-video-for-fast-streaming%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> <li id="cite_note-n1-5"><span class="mw-cite-backlink">^ <a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-n1_5-0"><sup><i><b>a</b></i></sup></a> <a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-n1_5-1"><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 class="citation web cs1"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://nginx.org/en/docs/http/ngx_http_mp4_module.html">"Module ngx_http_mp4_module"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Module+ngx_http_mp4_module&rft_id=https%3A%2F%2Fnginx.org%2Fen%2Fdocs%2Fhttp%2Fngx_http_mp4_module.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-6">^</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://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://ffmpeg.org/ffmpeg-formats.html">"FFmpeg Formats Documentation"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=FFmpeg+Formats+Documentation&rft_id=https%3A%2F%2Fffmpeg.org%2Fffmpeg-formats.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="https://en-m-wikipedia-org.translate.goog/wiki/Progressive_download?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB#cite_ref-7">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://support.jwplayer.com/customer/portal/articles/1430518-pseudo-streaming-in-flash"><i>Pseudo Streaming in Flash</i></a><span class="reference-accessdate">, retrieved <span class="nowrap">2015-07-17</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Pseudo+Streaming+in+Flash&rft_id=http%3A%2F%2Fsupport.jwplayer.com%2Fcustomer%2Fportal%2Farticles%2F1430518-pseudo-streaming-in-flash&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></span></li> </ol> </div> </div> </section> <div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(7)"> <span class="indicator mf-icon mf-icon-expand mf-icon--small"></span> <h2 id="External_links">External links</h2><span class="mw-editsection"> <a role="button" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=edit&section=7&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" title="Edit section: External links" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <section class="mf-section-7 collapsible-block" id="mf-section-7"> <ul> <li> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://web.archive.org/web/20100818043044/http://dowire.org/wiki/Streaming_vs_Progressive_Download"><i>Streaming vs Progressive Download</i></a>, archived from <a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://dowire.org/wiki/Streaming_vs_Progressive_Download">the original</a> on 2010-08-18</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Streaming+vs+Progressive+Download&rft_id=http%3A%2F%2Fdowire.org%2Fwiki%2FStreaming_vs_Progressive_Download&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></li> <li> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://www.microsoft.com/windows/windowsmedia/compare/webservvstreamserv.aspx"><i>Web Server vs. Streaming Server</i></a>, Microsoft<span class="reference-accessdate">, retrieved <span class="nowrap">2010-09-21</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Web+Server+vs.+Streaming+Server&rft.pub=Microsoft&rft_id=http%3A%2F%2Fwww.microsoft.com%2Fwindows%2Fwindowsmedia%2Fcompare%2Fwebservvstreamserv.aspx&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></li> <li> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://www.mediacollege.com/adobe/flash/streaming/progressive-download.html"><i>Flash Video: Progressive Download</i></a><span class="reference-accessdate">, retrieved <span class="nowrap">2010-09-21</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Flash+Video%3A+Progressive+Download&rft_id=http%3A%2F%2Fwww.mediacollege.com%2Fadobe%2Fflash%2Fstreaming%2Fprogressive-download.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></li> <li> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://web.archive.org/web/20150529160756/http://witalks.com/video-streaming-vs-progressive-downloading-or-http-streaming/"><i>Video Streaming Vs Progressive Download</i></a>, archived from <a rel="nofollow" class="external text" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://witalks.com/video-streaming-vs-progressive-downloading-or-http-streaming/">the original</a> on 2015-05-29<span class="reference-accessdate">, retrieved <span class="nowrap">2015-05-29</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Video+Streaming+Vs+Progressive+Download&rft_id=http%3A%2F%2Fwitalks.com%2Fvideo-streaming-vs-progressive-downloading-or-http-streaming%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AProgressive+download" class="Z3988"></span></li> </ul>   </section> </div> <noscript> <img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=mobile" alt="" width="1" height="1" style="border: none; position: absolute;"> </noscript> <div class="printfooter" data-nosnippet=""> Retrieved from "<a dir="ltr" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://en.wikipedia.org/w/index.php?title%3DProgressive_download%26oldid%3D1223316036">https://en.wikipedia.org/w/index.php?title=Progressive_download&oldid=1223316036</a>" </div> </div> </div> <div class="post-content" id="page-secondary-actions"> </div> </main> <footer class="mw-footer minerva-footer" role="contentinfo"><a class="last-modified-bar" href="https://en-m-wikipedia-org.translate.goog/w/index.php?title=Progressive_download&action=history&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB"> <div class="post-content last-modified-bar__content"><span class="minerva-icon minerva-icon-size-medium minerva-icon--modified-history"></span> <span class="last-modified-bar__text modified-enhancement" data-user-name="Uzume" data-user-gender="unknown" data-timestamp="1715417728"> <span>Last edited on 11 May 2024, at 08:55</span> </span> <span class="minerva-icon minerva-icon-size-small minerva-icon--expand"></span> </div></a> <div class="post-content footer-content"> <div id="mw-data-after-content"> <div class="read-more-container"></div> </div> <div id="p-lang"> <h4>Languages</h4> <section> <ul id="p-variants" class="minerva-languages"></ul> <ul class="minerva-languages"> <li class="interlanguage-link interwiki-de mw-list-item"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://de.wikipedia.org/wiki/Progressive_Download" title="Progressive Download – German" lang="de" hreflang="de" data-title="Progressive Download" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li> <li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://ko.wikipedia.org/wiki/%25ED%2594%2584%25EB%25A1%259C%25EA%25B7%25B8%25EB%25A0%2588%25EC%258B%259C%25EB%25B8%258C_%25EB%258B%25A4%25EC%259A%25B4%25EB%25A1%259C%25EB%2593%259C" title="프로그레시브 다운로드 – Korean" lang="ko" hreflang="ko" data-title="프로그레시브 다운로드" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li> <li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://ja.wikipedia.org/wiki/%25E3%2583%2597%25E3%2583%25AD%25E3%2582%25B0%25E3%2583%25AC%25E3%2583%2583%25E3%2582%25B7%25E3%2583%2596%25E3%2583%2580%25E3%2582%25A6%25E3%2583%25B3%25E3%2583%25AD%25E3%2583%25BC%25E3%2583%2589" title="プログレッシブダウンロード – Japanese" lang="ja" hreflang="ja" data-title="プログレッシブダウンロード" 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-pt mw-list-item"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://pt.wikipedia.org/wiki/Download_progressivo" title="Download progressivo – Portuguese" lang="pt" hreflang="pt" data-title="Download progressivo" 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://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://ru.wikipedia.org/wiki/%25D0%259F%25D0%25BE%25D1%2581%25D0%25BB%25D0%25B5%25D0%25B4%25D0%25BE%25D0%25B2%25D0%25B0%25D1%2582%25D0%25B5%25D0%25BB%25D1%258C%25D0%25BD%25D0%25BE%25D0%25B5_%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B8%25D0%25B2%25D0%25B0%25D0%25BD%25D0%25B8%25D0%25B5" title="Последовательное скачивание – Russian" lang="ru" hreflang="ru" data-title="Последовательное скачивание" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li> </ul> </section> </div> <div class="minerva-footer-logo"> <img src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" alt="Wikipedia" width="120" height="18" style="width: 7.5em; height: 1.125em;"> </div> <ul id="footer-info" class="footer-info hlist hlist-separated"> <li id="footer-info-lastmod">This page was last edited on 11 May 2024, at 08:55<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Content is available under <a class="external" rel="nofollow" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://creativecommons.org/licenses/by-sa/4.0/deed.en">CC BY-SA 4.0</a> unless otherwise noted.</li> </ul> <ul id="footer-places" class="footer-places hlist hlist-separated"> <li id="footer-places-privacy"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> <li id="footer-places-about"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Wikipedia:About?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB">About Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="https://en-m-wikipedia-org.translate.goog/wiki/Wikipedia:General_disclaimer?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB">Disclaimers</a></li> <li id="footer-places-contact"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://en.wikipedia.org/wiki/Wikipedia:Contact_us">Contact Wikipedia</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Code of Conduct</a></li> <li id="footer-places-developers"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://developer.wikimedia.org">Developers</a></li> <li id="footer-places-statslink"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://stats.wikimedia.org/%23/en.wikipedia.org">Statistics</a></li> <li id="footer-places-cookiestatement"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Cookie statement</a></li> <li id="footer-places-terms-use"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://foundation.m.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use">Terms of Use</a></li> <li id="footer-places-desktop-toggle"><a id="mw-mf-display-toggle" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://en.wikipedia.org/w/index.php?title%3DProgressive_download%26mobileaction%3Dtoggle_view_desktop" data-event-name="switch_to_desktop">Desktop</a></li> </ul> </div> </footer> </div> </div> <div class="mw-notification-area" data-mw="interface"></div> <script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-5c59558b9d-5gvx4","wgBackendResponseTime":172,"wgPageParseReport":{"limitreport":{"cputime":"0.136","walltime":"0.164","ppvisitednodes":{"value":471,"limit":1000000},"postexpandincludesize":{"value":13868,"limit":2097152},"templateargumentsize":{"value":84,"limit":2097152},"expansiondepth":{"value":8,"limit":100},"expensivefunctioncount":{"value":1,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":32424,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 134.906 1 -total"," 90.82% 122.524 1 Template:Reflist"," 74.44% 100.423 7 Template:Citation"," 10.03% 13.535 4 Template:Cite_web"," 1.27% 1.713 1 Template:Main_other"]},"scribunto":{"limitreport-timeusage":{"value":"0.083","limit":"10.000"},"limitreport-memusage":{"value":3587178,"limit":52428800}},"cachereport":{"origin":"mw-web.eqiad.main-64476968cd-9dxdk","timestamp":"20241102034430","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"Progressive download","url":"https:\/\/en.wikipedia.org\/wiki\/Progressive_download","sameAs":"http:\/\/www.wikidata.org\/entity\/Q13582265","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q13582265","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2009-02-10T15:34:04Z","dateModified":"2024-05-11T08:55:28Z"}</script> <script>(window.NORLQ=window.NORLQ||[]).push(function(){var ns,i,p,img;ns=document.getElementsByTagName('noscript');for(i=0;i<ns.length;i++){p=ns[i].nextSibling;if(p&&p.className&&p.className.indexOf('lazy-image-placeholder')>-1){img=document.createElement('img');img.setAttribute('src',p.getAttribute('data-src'));img.setAttribute('width',p.getAttribute('data-width'));img.setAttribute('height',p.getAttribute('data-height'));img.setAttribute('alt',p.getAttribute('data-alt'));p.parentNode.replaceChild(img,p);}}});</script> <script>function gtElInit() {var lib = new google.translate.TranslateService();lib.translatePage('en', 'en', function () {});}</script> <script src="https://translate.google.com/translate_a/element.js?cb=gtElInit&hl=en-GB&client=wt" type="text/javascript"></script> </body> </html>