[FFmpeg-trac] #8455(avcodec:open): libaom-av1 damages brightness range by switching yuvj420p to yuv420p

[FFmpeg]

#8455: libaom-av1 damages brightness range by switching yuvj420p to yuv420p
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             Reporter:  john123      |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  libaom       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by john123):

 So I tried comparing browsers and at least one (Android Chrome) renders
 the ffmpeg av1 output identically to the original color range.

 Firefox: color damaged by ffmpeg.
 Edge: color damaged by ffmpeg.
 Android Chrome: color looks good.

 So there is indeed some disagreement between players as to what to do with
 the ffmpeg output in this case.

 Any idea which part of ffmpeg's transformation is problematic?  Originally
 it seemed like the switch from yuvj420p to yuv420p was the main thing, but
 perhaps it's something else?
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Ticket URL: <https://trac.ffmpeg.org/ticket/8455#comment:21>
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