How does one get rid of the "onion gradient" artifacts of x265? In the sample images, they are apparent in the character's forehead and also in the purplish stripe near his hair (zoom a bit to see both better). The bitrate of the encodes is ~6900 kbps.
x264
x265, aq-mode 1
x265, aq-mode 2
Some base settings of the x265 encode:
Code:
--deblock -2:-1 --no-strong-intra-smoothing --cbqpoffs -3 --crqpoffs -3 --subme 3 --merange 24 --no-sao --no-rect --qcomp 0.7 --rd 6 --rd-refine
--aq-mode 1/aq-mode 2 --aq-strength 0.9 --ctu 16 --max-tu-size 8 --qg-size 16 --tu-inter-depth 2 --tu-intra-depth 2 --limit-tu 1 --limit-refs 3
--max-merge 2 --ref 5 --bframes 10
The x264 settings are pretty much --preset veryslow --tune film --no-fast-pskip --no-dct-decimate --deblock -2:-1 --qcomp 0.7.