To achieve "better" results than standard RARBG x265 encodes (which often prioritized speed and small file size), you can use the following improved x265 settings. These adjustments focus on and reducing artifacts like blocking and banding. Optimized x265 Encoding Settings

x265 --profile main10 --output-depth 10 --preset medium --crf 19-22 \ --aq-mode 3 --no-sao --no-strong-intra-smoothing \ --deblock -2:-2 --limit-refs 3 --limit-modes --me star \ --subme 5 --bframes 8 --rc-lookahead 40 --lookahead-slices 0 \ --no-open-gop --keyint 250 --min-keyint 23 \ --psy-rd 2.0 --psy-rdoq 1.0 --rdoq-level 2 \ --sar 1:1 --output "output.hevc" --input -

RARBG typically used --aq-mode 2 (Auto-variance). The new standard is (Auto-variance with bias to dark scenes). This prevents the "crushing blacks" seen in old RARBG releases.