HLS Playlist Tracks

[kixelated]

In order to get my dream of a HLS player working while pointed at moq-relay, we need some playlists.

Can someone modify the HLS import code such that:

1. Make sure any tracks we create have a reasonable extension, like .m3u8 or .m4s
2. We create a playlist.m3u8 track for the main playlist, with a single group/frame.
3. We create a playlist track for each rendition, for example audio.m3u8 and video.m3u8.
   • Each (unique) playlist update would be written as a new group/frame.
4. Rewrite the playlists to be relative:
   • The main playlist would point to ./audio.m3u8 and ./video.m3u8 or whatever the playlist tracks are called.
   • The media playlists would point to ./audio.m4s?group=x, or whatever the media tracks are called.

With all this in place, we should be able to start a HLS import and visit:

http://localhost:4443/fetch/bbb/playlist.m3u8
http://localhost:4443/fetch/bbb/audio.m3u8
http://localhost:4443/fetch/bbb/video.m3u8
http://localhost:4443/fetch/bbb/audio.m4s?group=xxx
http://localhost:4443/fetch/bbb/video.m4s?group=xxx

The only thing that should not work yet is the ?group= query parameter. It will instead fetch the latest group.

With all of this in place, we could point a HLS player to the first URL and it should just work TM.

[kixelated]

Bonus points if the fMP4 import also does this when an --hls flag is provided. That will require actually serializing a HLS playlist though.

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🔗 Related PRs

#801 - fixed ffmpeg command on pub-hls to generate 2 renditions [merged]

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[kixelated]

Related: #685