Quote:
Originally Posted by benwaggoner
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.
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Since at default frame-thread was 5 and I am currently setting it to 2 or 3
I am already improving quality - so with frame-thread 2 or 3 I doubt that anyone will see a difference.