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First of all there is a bug in ffmpeg swscale that saves 16 bit per 3 component PNG, so use zscale instead.
https://trac.ffmpeg.org/ticket/7978#comment:7
ffmpeg -i PQ_HDR_file.mp4 -vf zscale=matrixin=2020_ncl,format=gbrp16le -an -frames:v 1 out_zscale.png
This will get you correct image (bt.2020-ncl matrix is removed correctly to R'G'B'). You still should ...
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