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Old 12th August 2020, 08:31   #2  |  Link
Sharc
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Join Date: May 2006
Posts: 3,997
I think you can't generalize. The '--tune xx' means specific encoder tweaks for optimizing certain criteria. '--tune ssim' is just one of these aiming at achieving the highest ssim metric. Better metrics do however not necessarily mean better visual experience.
'--tune xxx' and psy settings often increase the file size for a given CFR. So when disabled or overruled (e.g. by --tune ssim) the file size will become smaller. It also depends on the source.

Edit:
See the discussion here
https://superuser.com/questions/5644...n-of-x264-tune

Last edited by Sharc; 12th August 2020 at 08:48.
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