Quote:
Originally Posted by asarian
I understand what you're saying. I'm just surprised that even lowering CRF by two, for aq-mode 2, still yields a file which is so much smaller. For another movie (Evangelion 1.11) I had tested and calculated that I needed to go from CRF 16 to 14.2, in order to compensate for the bitrate loss under aq=2. Seems for this Blade Runner Blu-Ray I need to lower CRF even significantly further. So, predicting a 'general-compensation factor' for aq=2 proves more difficult than I thought.
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IMHO trying to hit a specific target bitrate by iteratively adjusting CRF isn't the intended (convenient) way of using CRF mode. If you want to hit a specific (average) bitrate, then 2-Pass mode is for you. But if you want to go the CRF route, you should adjust the CRF value for visual quality, not for bitrate! So first decide between AQ1/AQ2 and all the other options (using 2-Pass mode for visual comparisons),
then find the highest possible CRF for your settings that still gives acceptable quality. And then use that CRF value without looking at the bitrate...