[Cin] HDR footage from images via ffmpeg

[Andrew Randrianasulu]

сб, 27 мая 2023 г., 20:20 Andrew Randrianasulu <randrianasulu at gmail.com>:

>
>
> сб, 27 мая 2023 г., 20:09 Phyllis Smith <phylsmith2017 at gmail.com>:
>
>> Certainly merits looking at to see how useful it might be to add.
>>
>
> https://github.com/sekrit-twc/zimg
>
> ah,  c++17! so only new OSes with new compilers will get it ....
>


upd: it was only recently-merget cxx17 branch on github, 3.0.4 release
apparently work on older os/compilers ...

https://github.com/sekrit-twc/zimg/releases/tag/release-3.0.4

"checking whether C++ compiler accepts -std=c++14... yes" on gcc 11.2 may
be we can dive deeper in history ...

may be 2.8?

https://src.fedoraproject.org/repo/pkgs/zimg/




>> On Sat, May 27, 2023 at 10:56 AM Andrew Randrianasulu via Cin <
>> cin at lists.cinelerra-gg.org> wrote:
>>
>>> Note there was additional discussion about using zimg/zscale filter in
>>> ffmpeg for getting p3-d65
>>>
>>> https://www.reddit.com/r/ffmpeg/comments/ty9c5k/color_metadata_dcip3/
>>>
>>>
>>> ====
>>>
>>>      Zscale does have support for DCI white point P3 and D65 P3.
>>>
>>> ffmpeg -i INPUT.mp4 -c:v libx265 -crf 20 -vf
>>> zscale=r=limited:m=2020_ncl:t=2020_10:p=smpte431:c=topleft,format=yuv420p10
>>> -color_primaries smpte431 -colorspace bt2020nc -color_trc bt2020_10bit
>>> -color_range tv OUTPUT.mp4
>>>
>>>
>>> ===
>>>
>>>
>>> I wonder if such file plays in say mpv as HDR on your display?
>>>
>>> old ffmpeg patches (2016):
>>> http://ffmpeg.org/pipermail/ffmpeg-devel/2016-October/201962.html
>>>
>>> "vf_colorspace: Add support for smpte 431/432 (dci/display p3)
>>> primaries" but previous 2 patches might be not so trivial ...
>>>
>>>
>>>
>>> https://discuss.pixls.us/t/experimenting-with-hlg-and-hdr10-for-still-images/23361?page=2
>>>
>>> ====
>>>
>>> ffmpeg -loop 1 -r 24 -t 30 -i DSC02236.tif -vf
>>> pad=3840:2160:302:0:black,zscale=tin=linear:t=arib-std-b67:npl=800:m=bt2020nc,format=yuv420p10le
>>> -c:v libx265 -preset medium -crf 26 -x265-params
>>> "colorprim=bt2020:atc-sei=18:colormatrix=bt2020nc" naturalbridge.mp4
>>>
>>> ====
>>>
>>> zimg2 should be in Debian since late 2021
>>>
>>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=966059
>>>
>>> ffmpeg (7:4.3.2-2) experimental; urgency=medium
>>>  .
>>>    * debian/:
>>>      - Build with zimg (Closes: #966059 <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=966059>)
>>>
>>>
>>> I wonder if cingg should add zimg too?
>>>
>>> --
>>> Cin mailing list
>>> Cin at lists.cinelerra-gg.org
>>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>>
>>
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