Quote:
Originally Posted by Grojm
Then the metric used by CRF to determine quality must be very fragile and contra intuitive. I'd expected that it will optimize for some visual model to offer such and such quality level. But I understand your point.
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Yes, all quality metrics are not very accurate. Assigning a single number to quality (so computers can understand it) has been one of those long running unsolved problem since the beginning.
None of the "constant quality" modes from any codec are constant when you change other settings, x264 behaves in almost exactly the same way. In general the faster settings have noticeably lower quality at the same crf.