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I made a quick test :
source : Kimono1_1920x1080_24
x264 --preset veryslow --crf 23 : file output 6.38 Mo ( bitrate 5351 kbps ) ssim 0.955018 psnr 41.056804
x265 --preset slow 2 pass : 6.28 Mo ssim 0.960803 psnr 42.029059
x265 --preset slow 2 pass : 6.42 Mo ssim 0.961065 psnr 42.070003
vp9 -cpu-used 1 2 pass : 6.29 mo ssim 0.960090 psnr 41.922800
and for av1 -cpu-used 1 2 pass : 6.43 ssim 0.961722 psnr 42.229238
so only a little better than vp9 and x265 for the moment.
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