[FFmpeg-trac] #9374(undetermined:closed): mkv to mp4 has a color tint

[FFmpeg]

#9374: mkv to mp4 has a color tint
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             Reporter:  razvan       |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:  duplicate
             Keywords:  mp4 tint     |               Blocked By:
  color                              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by jeeb):

 This is actually two bugs, one of which you are correct about (RGB matrix
 not being reset in the scale filter leading to 4:4:4 YCbCr being
 mistakenly flagged as RGB).

 The other one (captured bgr0 getting flagged as limited range - no scale
 filter involved at all) is a result of a piece of old logic which was
 correct when x264 only supported YCbCr, but was not changed as RGB support
 was added to the wrapper. If the range flag was set to unspecified, it
 would only set the full range flag for the YUVJ pixel formats and set it
 to off otherwise.

 I noticed this same logic was also copied over to the libx265 wrapper.

 I have posted a patch set to fix this issue in the libx264 and libx265
 wrappers for now:
 https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=4613

 Of course, the logic generating the AVFrame should probably set the range
 flag, but that is not something for tonight.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9374#comment:3>
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