Dynamic Noise Reduction
This filter reduces changes across frames by eliminating dynamic noise without blurring. This helps MPEG compression without damaging image quality. Two version of this filter exist.
The first is my original, which is rather unoptimised. It locks noise into place and thus helps MPEG compression the most.
The second has been ported to MMX by Avery Lee. This one is a lot faster and blends noise over time. This improves image quality, but doesn't help MPEG compression as much.