Quote:
Originally Posted by TD-Linux
Unfortunately it's impossible to use VMAF directly for RDO because an encoder has to evaluate distortion on very small blocks, down to 8x8 pixels. So the best you can do is come up with something that approximates it.
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And VMAF isn't THAT great a metric. Many encoders will do some more sophisticated things internally. particularly around maintaining temporal coherence. VMAF does at least include a lightweight interframe comparison metric, but it doesn't do anything new to figure out how the variation of quality of individual frames impacts the overall viewer experience.