Quote:
Originally Posted by AlekseiV
I cannot see a difference in quality between the YV12->RGB->YV12 method and the proper SmoothLevels.ColorMatrix method. I know it exists (and Subtract can show it), but I can't see it, even flipping back and forth between them in comparison. But I can notice a difference in speed; SmoothLevels.ColorMatrix halves my playback speed. Encode speed is only ~15% slower, but it still hurts.
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It's up to you, but colorspace conversion are lossy
You can use levels or coloryuv, instead of smoothlevels and it should be faster
coloryuv(levels="PC->TV")
But smoothlevels does more than just change the levels, it dithers (have a look at the encoded YV12 video in a dark gradient area like shadows, you should see more banding in the video adjusted by levels or coloryuv, but it may or may not be noticable )