Quote:
Originally Posted by blublub
phew, quite some posts I have to catch up with since my last visit.
The encoders sets frame-threads to "5" in my setup when it is not otherwise specified, so automode is "5".
If I manually reduce that to a max of "3" it certainly won't degrade quality compared to the defaults.
Primary question for me is if the option "numa-pools=48" does reduce quality as I manually raised it from the default of 32 to over 50 which gave me an incredible performance boost.
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The number of frame threads can have a significant impact on quality. It was pretty overwhelming on early versions of x265, and it's still ideal to run at -F 1 if possible for high quality/efficiency encoding.
Lookahead threading is reduced in slower presets, but I'm fuzzy on if and how it actually impacts quality much.
Other than that, I don't think that thread count impacts quality so much.
For Intel dual-socket systems at least, I've often found that pinning a job to just one socket ala --pools "-,+" has minimal impact on performance, although that probably varies with encoded frame size and number of cores per socket.