YouTube仍在使用DASH吗?

时间:2018-05-17 06:56:34

标签: youtube mpeg-dash

YouTube是否使用MPEG-DASH提供视频?

我看到如果我在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。因此,YouTube维护与服务器的连接并请求" piece" "范围内的视频" HTTP请求的字段?还是下载像DASH标准化的固定时间段?

我再也无法获得MPD:How to get .mpd file for a youtube video

谢谢!

1 个答案:

答案 0 :(得分:0)

是的,YouTube 仍在使用 DASH。它并非在所有视频上都可用,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 720p60、1080p 和 1080p60 未包含在页面上的播放器响应中):https://www.youtube.com/watch?v=AI7ULzgf8RU

YouTube 使用单段流、通过 HTTP Range 标头的多段和通过 URL 的多段。

以下是来自 YouTube 的 DASH 清单示例,于 2021 年 4 月 18 日拍摄。删除了一些表示以符合 StackOverflow 答案大小限制。

<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" />
          <S d="5015" />
          <S d="4969" />
          <S d="5016" />
          <S d="5015" />
          <S d="4969" />
          <S d="5016" />
          <S d="5015" />
          <S d="4969" />
          <S d="5016" />
          <S d="5015" />
          <S d="4969" />
          <S d="5016" />
          <S d="5015" />
          <S d="4969" />
          <S d="5016" />
          <S d="5015" />
          <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" bandwidth="50267">
        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2" />
        <BaseURL>https://r1---sn-0oqxgoxu-3c2e.googlevideo.com/videoplayback/expire/1618776406/ei/9jx8YM-wDNSjgAfPvaeIBQ/ip/ip_removed/id/008ed42f381ff115/itag/139/source/youtube/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/audio%2Fmp4/otfp/1/gir/yes/clen/645142/lmt/1506791779520808/dur/108.158/mt/1618754439/fvip/5/keepalive/yes/fexp/24001373,24007246/sparams/expire,ei,ip,id,itag,source,requiressl,vprv,ratebypass,mime,otfp,gir,clen,lmt,dur/sig/AOq0QJ8wRgIhAPMCUxM1MMLy8KfcHLf7ip7z5Rq4tt6NBspreWJMZYXbAiEAmwrgykyrk4z15eXW-GnmnRwoZ9-VUtXYmnEcTgcL3iQ%3D/lsparams/mh,mm,mn,ms,mv,mvi,pcm2cms,pl,initcwndbps/lsig/AG3C_xAwRQIhAKMOYmNU9KPdWmMNCpYp0ZOOeYqLwrCYH8qQq5afZzoWAiAJRxbgT4hTgwX49wMuWsxnqqMt9Ci0kCBemIlGZGalCQ%3D%3D/</BaseURL>
        <SegmentList>
          <Initialization sourceURL="range/0-593" />
          <SegmentURL media="range/890-31517" />
          <SegmentURL media="range/31518-61296" />
          <SegmentURL media="range/61297-90915" />
          <SegmentURL media="range/90916-120715" />
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          <SegmentURL media="range/150553-180202" />
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      </Representation>          
    </AdaptationSet>
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        </SegmentTimeline>
      </SegmentList>
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