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Old 25th July 2018, 04:27   #3  |  Link
lansing
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Join Date: Sep 2006
Posts: 1,657
Your observation is pretty close to mine. The recommended equivalent of x264 crf 18 in x265 is crf 21, but on my tests, crf 21 medium gave me artifact on one particular scene. Raising the preset to slow fixed it, but it nearly doubled my encoding time. Lowering crf to 18 medium also fixed it with only a very small increase in encoding time.

So crf 18 medium is the better of the two. Only use slow preset if you have a very fast machine.
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