[FFmpeg-trac] #8049(avformat:open): dash muxer does not specify full codec string parameters for AV1

[FFmpeg]

#8049: dash muxer does not specify full codec string parameters for AV1
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             Reporter:  brion       |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  av1 dash    |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by jamrial):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  undetermined => avformat
 * priority:  minor => normal
 * version:  unspecified => git-master
 * analyzed:  0 => 1


Comment:

 The dash muxer is effectively not setting the codec string with the
 minimum required values beyond the sample entry 4CC.

 Unfortunately, even if we were to make the muxer look at the stream's
 extradata to get the required information, the libaom encoder is currently
 not propagating said extradata to begin with because of a known bug[1] in
 their API that hasn't been fixed in almost a year now. It would work only
 in remuxing scenarios until that's solved.

 [1] https://bugs.chromium.org/p/aomedia/issues/detail?id=2208

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Ticket URL: <https://trac.ffmpeg.org/ticket/8049#comment:2>
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