[FFmpeg-trac] #9146(undetermined:open): ffmpeg gives different value of color_trc if video stream contains an atc sei for mp4 and ts file

[FFmpeg]

#9146: ffmpeg gives different value of color_trc if video stream contains an atc
sei for mp4 and ts file
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             Reporter:  a1q123456    |                    Owner:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  hevc         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by Balling):

 * status:  new => open

Comment:

 >the code overrides avctx->color_trc is from function

 You must override it. HLG is signalled in ATC, VUI signals HDR, because
 HLG has SDR layer that should be used to present SDR. That is the point.
 Also ATC SEI is really only allowed in TS, i.e. in DVB-X2 applications.

 One need to check whether HLG ATC SEI is even present in mp4 file. Will
 do.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9146#comment:5>
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