YouTube 还在使用 DASH 吗？
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【中文标题】YouTube 还在使用 DASH 吗？【英文标题】：Is YouTube still using DASH? 【发布时间】：2018-10-27 08:26:25 【问题描述】：YouTube 是否使用 MPEG-DASH 来传送其视频？
我发现，如果我在 youtube-dl 中为某些视频使用 -F 选项，则没有“DASH 视频”，例如 https://www.youtube.com/watch?v=Us-TVg40ExM。那么 YouTube 是否保持与服务器的连接并通过 HTTP 请求的“范围”字段请求“一段”视频？还是像 DASH 那样下载固定时间段？
我无法再获得 MPD，例如：How to get .mpd file for a youtube video
谢谢！
【问题讨论】：
【参考方案1】：是的，YouTube 仍在使用 DASH。它并非在所有视频中都可用，在某些视频中仅有时可用。这是一个视频，其中 DASH 清单始终可用并且实际上用于大多数更高质量的流（您可以看到页面上的播放器响应中不包含 720p60、1080p 和 1080p60）：https://www.youtube.com/watch?v=AI7ULzgf8RU
YouTube 使用单片段流、通过 HTTP Range 标头的多个片段以及通过 URL 的多个片段。
这是来自 YouTube 的 DASH 清单示例，拍摄于 2021 年 4 月 18 日。为了适应 *** 答案大小限制，我们删除了一些表示形式。
<MPD schemaLocation="urn:mpeg:DASH:schema:MPD:2011 DASH-MPD.xsd" minBufferTime="PT1.500S" profiles="urn:mpeg:dash:profile:isoff-main:2011" type="static" mediaPresentationDuration="PT108.158S">
<Period>
<AdaptationSet id="0" mimeType="audio/mp4" subsegmentAlignment="true">
<Role schemeIdUri="urn:mpeg:DASH:role:2011" value="main" />
<SegmentList startNumber="0" timescale="1000">
<SegmentTimeline>
<S d="5016" />
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<S d="4969" />
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<S d="4970" />
<S d="5015" />
<S d="5016" />
<S d="4969" />
<S d="3158" />
</SegmentTimeline>
</SegmentList>
<Representation id="139" codecs="mp4a.40.5" audiosamplingRate="22050" startWithSAP="1" band>
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2" />
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<BaseURL>https://r1---sn-0oqxgoxu-3c2e.googlevideo.com/videoplayback/expire/1618776406/ei/9jx8YM-wDNSjgAfPvaeIBQ/ip/ip_removed/id/008ed42f381ff115/itag/299/source/yt_otf/requiressl/yes/mh/ZD/mm/31,29/mn/sn-0oqxgoxu-3c2e,sn-jvhnu5g-n8vy/ms/au,rdu/mv/m/mvi/1/pcm2cms/yes/pl/22/initcwndbps/1563750/vprv/1/ratebypass/yes/mime/video%2Fmp4/otfp/1/otf/1/lmt/1606324665474260/mt/1618754439/fvip/5/keepalive/yes/fexp/24001373,24007246/sparams/expire,ei,ip,id,itag,source,requiressl,vprv,ratebypass,mime,otfp,otf,lmt/sig/AOq0QJ8wRgIhAIJaI4fwVHVMkDdgjeB34DH3q-HjQETXC-TxriUDZHMsAiEA09uSJGQVvEOASZoejTj1-kumWJ_XUgrxvXTOPTkKou8%3D/lsparams/mh,mm,mn,ms,mv,mvi,pcm2cms,pl,initcwndbps/lsig/AG3C_xAwRQIgVfQQG_i51sj2h35e9kBAc2mGE27puFOo_T53ebqETAICIQCzx8G2TaoWD3n2DLPkUksey8YEBDWhKa_FkcXdZklY9Q%3D%3D/</BaseURL>
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</MPD>
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