This is an example of Video Artifact Premium denoisers. The original video is 1920x1080 50p AVCHD MTS file from Sony HX20 at a maximal zoom level. It is very noised and low quality. I used a stack of per-channel denoisers to get it clean and more stable. A small grain is also added.
Digital noise and compression artifacts are removed. Small noise is added. 2x crop.
Difference / Before / After