[FFmpeg-trac] #7037(avcodec:open): ffmpeg destroys HDR metadata when encoding

[FFmpeg]

#7037: ffmpeg destroys HDR metadata when encoding
-------------------------------------+-----------------------------------
             Reporter:  mario66      |                    Owner:  cehoyos
                 Type:  enhancement  |                   Status:  open
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  libx265 hdr  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-----------------------------------

Comment (by Balling):

 I am going to attach a sample where HDR10 static metadata changes when
 scene changes. https://gitlab.freedesktop.org/gstreamer/gst-plugins-
 base/uploads/16c628c535865d7282a48317064345a2/out.mp4

 That already crashes h265parse of gstreamer due to multiple SPS. mpv does
 not have such a problem and ffmpeg too. Nice.

 You can use
 {{{
 ffprobe -show_frames -select_streams v out.mp4
 }}}
 to check it out! Maybe add to ffprobe FATE, would be nice.


 Change is as follows on frame pkt_pos=7258705:

 {{{
 side_data_type=Content light level metadata
 max_content=284
 max_average=145
 }}}

 to

 {{{
 side_data_type=Content light level metadata
 max_content=378
 max_average=277

 }}}

 According to free CTA-861-H, it must be supported by display and players.

 Also, I am pretty sure it is not VFR, but alas mkv in ffmpeg is very
 strange, it thinks it is VFR on all mkv's (and I got this file from mkv
 blu-ray rip by ripping it D:) ). Maybe adopting a MatroskaParser like
 Nevcariel did for LavFilters fork (and he even did fix some of other
 ffmpeg bugs) will be it... But I doubt it.
 See:
 https://git.1f0.de/gitweb/?p=ffmpeg.git;a=commit;h=629d82013a9d5471bb5323890bed6969bdbe8885;js=1

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Ticket URL: <https://trac.ffmpeg.org/ticket/7037#comment:84>
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