video-streaming - 自适应流播放器播放列表更新间隔

Question

关于自适应流媒体播放器的行为(具体来说，我对 HLS 和 DASH 感兴趣)，它应该多久重新加载播放列表？这是指定的还是取决于播放器的实现？

当它重新加载播放列表时，是只为所谓的变体播放列表完成还是每次重新加载主？

这对于直播和点播内容有什么不同吗？

Answer 1

对于 HLS见 General Client Responsabilities在草案中。请注意，这是最新版本，如果您需要旧版本，请检查其他版本。
一些相关摘录:
您只需重新加载 LIVE和 EVENT没有 EXT-X-ENDLIST 媒体播放列表 (所以没有大师重新加载)

The client MUST periodically reload a Media Playlist file to learnwhat media is currently available, unless it contains an EXT-X- PLAYLIST-TYPE tag with a value of VOD, or a value of EVENT and theEXT-X-ENDLIST tag is also present.

重装:

When a client loads a Playlist file for the first time or reloads aPlaylist file and finds that it has changed since the last time itwas loaded, the client MUST wait for at least the target durationbefore attempting to reload the Playlist file again, measured fromthe last time the client began loading the Playlist file.

If the client reloads a Playlist file and finds that it has notchanged then it MUST wait for a period of one-half the targetduration before retrying.