[FFmpeg-trac] #9146(undetermined:open): ATC SEI of HLG (18) should overwrite color_trc from VUI in mp4, just like in ts and mkv (was: ffmpeg gives different value of color_trc if video stream contains an atc sei for mp4 and ts file)

FFmpeg trac at avcodec.org
Wed Jun 2 20:42:57 EEST 2021


#9146: ATC SEI of HLG (18) should overwrite color_trc from VUI in mp4, just like
in ts and mkv
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------
Changes (by Balling):

 * summary:
     ffmpeg gives different value of color_trc if video stream contains an
     atc sei for mp4 and ts file
     =>
     ATC SEI of HLG (18) should overwrite color_trc from VUI in mp4, just
     like in ts and mkv

Comment:

 And this was just a bug in Mediainfo!!! HAHA.
 SEI_rbsp_stop_one_bit on hevc-hdr.mp4 is only printed on android, WTF.
 Also, mp4 has ATC SEI.

 mpv nevertheless recognizes both as HLG, so no problem there. Nice.


 Also I see a problem in mkv too, but that is a common problem that
 transfer_characteristics_Original is uses somehow by ffmpeg, why BTW?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9146#comment:6>
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