Use 0p as audio track

[B0pol]

0p is currently added as video track. It should be added as audio track

Example video: https://framatube.org/videos/watch/d6bba4fa-b67f-4e27-be4f-bb5406dc5159

See Chocobozzz/PeerTube#3281

[albjeremias]

if there are hints, they are welcome.. i will try to start from this:
https://github.com/TeamNewPipe/NewPipeExtractor/pull/232/files

[AudricV]

@albjeremias You don't have to try to fix something, they will be extracted with my PR: #663.
However, their bitrate will be not available, because a separate request will be needed to get metadata like this (or a change in PeerTube video JSON API).

[opusforlife2]

However, their bitrate will be not available, because a separate request will be needed

Still the case?