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Old 10th July 2016, 08:07   #1037  |  Link
youli
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Join Date: Mar 2015
Location: Ukraine
Posts: 23
I made a lot of rips. In my experience, in most cases the average QP for B frames is one of the main indicators of quality.

At crf mode for x264 default value 23 minus 5 = 18 - very good quality (average QP for B will less then 23).
So at crf mode for x265 default value 28 minus 5 = 23 (average QP for B will less then 28).
It is just analogy
Of course the options - me, subme, merange, rc-lookahead, qcomp... are very important too.
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