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/

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     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   

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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

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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




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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)

I wonder if cingg should add zimg too?

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