I don't know anything that works as well as Dynamic Noise Reduction(vdub filter) for Avysynth.. the results are no where near as good. I set the noise threshold usually between 12 to 16. Here are the before and after results from using Dynamic Noise Reduction..
before
after
see how much I cleaned it up? Before there was alot of grain movement you'll notice if you look at the sky in the scene.. and after using Dynamic Noise Reduction it doesn't show as much ugly movement. The threshold was set to 12. So anyone know how I could get the same thing for Avisynth? Please help! Thanks!