Thanks for the answer.
I did more testing on handbrake vs vdub with x265.
with the same settings, I get 0.37fps on vdub and 0.21fps on handbrake (VerySlow, 10 bit, 25 crf)
vdub matches the colors and contrast so the output is superior. The file size is also about 15% smaller.
The results are even worse when resizing to 2560 from 3840, both use Lanczos 3
handbrake: 0.45fps, terrible contrast lost, 17.7MB
vdub: 0.82fps, matching contrast and colors perfectly, 15.9MB
Hopefully vdub can do batch of input folders like handbrake!
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