[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 Balling):

 "yuvj420p(pc, smpte170m/bt470bg/bt2020-12)"

 You cannot be serious right now. bt2020-12 transfer is just bt709. You do
 not need it especially for 8 bit file!!! WTF. Why??

 Next, smpte170m is SMPTE C primaries. Nobody uses this anymore. bt470bg
 matrix... well, okay... at least it is what is used with SMPTE C. Not that
 the matrix was derived from SMPTE C, it was derived from BT.470 System M,
 so it is still wrong, but whatever.

 Please provide in.mp4.

 Also try this: ffmpeg.exe -i in.mp4 -vf
 scale=out_color_matrix=bt470bg:out_range=pc,format=yuv420p -c:v libaom-av1
 -color_primaries smpte170m -color_trc bt709 -colorspace bt470bg
 -color_range pc out.mp4

 And please. Use mpv player! Other players are so broken...
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Ticket URL: <https://trac.ffmpeg.org/ticket/8455#comment:18>
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