Artifacts in Anime/Toon Footage

[Mol]

heh okey after render it looks a tad better with gradfun and some deblock at least it's not moving that much and looks more like white thing which is kinda acceptable (i guess puting there some keyframe and replacing it with gradient/or clouds would be much faster tho : p) but yeah in worst case somebody will slain me

[Mister Hatt]

I'm just going to point out that a debander adds dither. This is what causes banding in the first place. Throwing a lot of dither and then compressing it gives you even MORE banding, hence why 50 didn't work.