[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):

 Android Chrome does not support full range! At all, in all codecs! Even
 windows one is very broken now and fixed only in Canary, but even there
 rises black. I know since I am one of Android Chrome and Chromium color
 developers. See (yes comment 97, it is a big thread):
 https://bugs.chromium.org/p/chromium/issues/detail?id=1068690#c97
 >switch from yuvj420p to yuv420p

 There is no such thing as yuvj420p with new encoder like AV1 or jpeg2000!
 It is just not supported. When you used that it selected limited range.
 Now, modern way is to select yuv420p and then select the tange of that
 yuv420p with -vf scale. Okay?
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Ticket URL: <https://trac.ffmpeg.org/ticket/8455#comment:22>
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