How does XviD compare to the newest AVC H.264 codec, which also has a chance of being included in HD-DVD? If i have a 4GB MPEG-4 file in XviD and AVC, which will have higher quality? I'm guessing AVC, ...

I just built a new PC. I'd rather not install every codec ever released. Xvid will play Divx3 files if the .avi has its FourCC code changed to MPEG43. However I'd rather not hassle with changing the ...