[HELP] Upscale suggestions needed

[Selur]

To do this properly, you would need to filter each scene separately.
Not filtering the scenes separately, will always a compromise between hiding artifacts and loosing details. Without adjusting per scene, the strong filtering required for some will be maybe too strong for others.
mcdegrainsharp + MCTemporalDenoise seems like a decent method to be able to adjust this.
Alternatively, if you got a fast NVIDIA GPU using SCUNet+CAS, gives some nice results, but might be too strong in some scenes.
Once the source is cleaned enough, using NNEDI3 is probably good.

SCUNet + CAS + NNEDI3 + Filmgrain:





MCDegrainSharp + MCTemporalDenoise(medium) + CAS + NNEDI3 + Filmgrain:






Cu Selur