[HELP] Change the Default Sharpening Value of CAS from 0.6 when using stepped resize

[Selur]

Are these 'vertical line like blocking artifacts' visible in the Vapoursynth Preview?
Can you share a short sample of a clip before reencoding which get these artifacts after filtering and reencoding and also share your filtering and reencoding settings?
(without actually seeing and be able to reproduce the problem, it's hard to suggest anything)

wild guesses, assuming those artifacts are not visible in the Vapoursynth Preview and thus are caused by the reencoding:
(I also assume you use a high enough bit rate / low enough quantizer to keep those details)
a. make sure to use 10bit encoding
b. since this only happens in grainy areas, try using 'tune grain' or some of its settings

--aq-mode 0
        --cutree 0
        --ipratio 1.1
        --pbratio 1.0
        --qpstep 1
        --sao 0
        --psy-rd 4.0
        --psy-rdoq 10.0
        --recursion-skip 0

source: https://x265.readthedocs.io/en/master/pr...film-grain
This will increase the required bit rate for the same quality, but will try to keep more grain.

=> to give better help, I would need a way to reproduce this.

Cu Selur

Ps.: Nowadays, I would not recommend to use -3/-3, but at most -1/-1.