Looks like ringing artifacts which got compressed too strong.
Assuming this is a reencode if your source and the source does not have so strong compression artifacts, de-ringing filters might help.
Would need an uncropped sample to suggest anything specific. (upload it somewhere and share a link here or send it to me via pm and I can look at it after work)
Cu Selur
Ps: using BasicVSR++:
![[Image: grafik.png]](https://i.ibb.co/bKXK9Gg/grafik.png)
Assuming this is a reencode if your source and the source does not have so strong compression artifacts, de-ringing filters might help.
Would need an uncropped sample to suggest anything specific. (upload it somewhere and share a link here or send it to me via pm and I can look at it after work)
Cu Selur
Ps: using BasicVSR++: