[FFmpeg-trac] #9146(undetermined:open): ATC SEI of HLG (18) should overwrite color_trc from VUI in mp4, just like in ts and mkv
FFmpeg
trac at avcodec.org
Thu Jun 3 04:56:24 EEST 2021
#9146: ATC SEI of HLG (18) should overwrite color_trc from VUI in mp4, just like
in ts and mkv
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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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Comment (by a1q123456):
Replying to [comment:6 Balling]:
> 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 used somehow by ffmpeg, why BTW?
Oh, I see, if we override the color_trc by ATC, we'll have no chance to
find out the original value, and if we don't override the color_trc by
ATC, it'll break some rule. So I think maybe add a new field to
AVCodecContext to indicate the original value can solve this problem?
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9146#comment:7>
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