Ok, I've been trying to solve this problem for a long time. Every movie I have that uses the Xvid codec plays fine but when there are dark colors in the movie there is a lot of pixelation and curves where you can see the shading go from dark to light and so on. I've already tried disabling ffdshow from decoding the xvid so that it would use the XVID codec on my system but it had no effect. I currently have the Tsunami filter pack and Koepi's XVID codec pack. I use Windows media player (classic and version 9), BS Player, DIVX player, etc. Oh yeah, one more thing, it will play (pixelated) in everything but DIVX. It won't even play in DIVX. If anyone can help with this problem or have any suggestions, I'm all ears. Please HELP!