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Old 31st July 2018, 03:36   #6244  |  Link
foxyshadis
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Join Date: Nov 2004
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Quote:
Originally Posted by K.i.N.G View Post
I really like x265 but I seem to be unable to get rid of linear smearing/stretching artifacts when there are fast moving objects in a scene.
Is there a specific parameter targeted at improving this, without increasing the bit rate in other areas (those are fine)?

My settings are:
--crf 17 --preset veryslow --profile main10 --level-idc 5 --output-depth 10 --psy-rdoq 4 --aq-mode 3 --qg-size 64 --qcomp 0.7 --subme 5 --master-display "G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(40000000,50)" --colorprim bt2020 --colormatrix bt2020nc --transfer smpte2084 --max-cll "457,179" --hdr --hdr-opt --deblock -1:-1 --no-sao --no-strong-intra-smoothing

example:
The only way to get x265 to retain detail/grain in absolutely all circumstances is --tune grain combined with enough bitrate to not starve it. That will massively change but the bitrate and distribution of your entire movie, not a first choice if you're happy with the rest.

I noticed you raised qcomp to 0.7 from the default 0.6, effectively telling x265, "I want fast-motion and difficult-to-compress scenes compressed harder than usual." Was there a specific reason for raising it?

Lastly, are you sure you're not fixating on three frames that in motion will be utterly unnoticeable everyone who actually watches? It's a very common ailment when you go down the rabbit hole of settings. You have to balance frame analysis, especially in "fast moving objects" scenes, with real-life watching of a whole whole scene.
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