[FFmpeg-trac] #8929(avcodec:open): ffmpeg can encode rgb av1 webm files but not decode them

[FFmpeg]

#8929: ffmpeg can encode rgb av1 webm files but not decode them
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             Reporter:  av1masterrace  |                    Owner:  (none)
                 Type:  defect         |                   Status:  open
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  libaom         |               Blocked By:
             Blocking:                 |  Reproduced by developer:  1
Analyzed by developer:  0              |
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Comment (by petr.diblik):

 Replying to [comment:18 Balling]:
 > Replying to [comment:17 petr.diblik]:
 > The keyword to search is MC_IDENTITY. MC_IDENTITY means RGB. Sigh. And
 no, Youtube always reencods since they are targeting not high quality with
 AV1 but lower bitrate. So RGB will have to be reencoded to YCbCr, I
 suppose.
 >
 > v3 of my patch.
 https://patchwork.ffmpeg.org/project/ffmpeg/patch/20210606051612.89211-1-val.zapod.vz@gmail.com/
 Thanks for the clarification and the patch.
 By YouTube being affected I mean that an uploaded video (whatever it's
 reencoded to) has wrong colors.
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Ticket URL: <https://trac.ffmpeg.org/ticket/8929#comment:19>
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