[Cin] zscale's tonemapping on input

[Andrew Randrianasulu]

ср, 7 мая 2025 г., 18:38 Andrew Randrianasulu <randrianasulu at gmail.com>:

> Using this page
>
> https://www.reddit.com/r/ffmpeg/comments/17ma3mm/hdr_tone_mapping_not_working/
>
> and our guide at
>
> https://cinelerra-gg.org/download/CinelerraGG_Manual/File_naming_convention.html
>
>
> I come up with this (working) line to put in file.opts for HDR to SDR
> bt 709 100 nits mapping:
>
>
> video_filter=zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0,zscale=t=bt709:m=bt709:r=tv,format=yuv444p
>
> But it only works with software decoding. At, like, 2.3 fps for full 4k
> frame.
>
> And also you need to compile your ffmpeg used in cingg with z.img library.
>


Got it working with Vulkan hw decoding, not much faster, but leaves cingg a
bit more responsive:

video_filter=zscale=tin=smpte2084:min=bt2020nc:pin=bt2020:rin=tv:t=smpte2084:m=bt2020nc:p=bt2020:r=tv,zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0,zscale=t=bt709:p=bt709:m=bt709

monster line from

https://forum.doom9.net/showpost.php?p=1898421&postcount=56

I think we better to put those examples somewhere in manual before I forgot
them/lost my opts files ;)
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