looks like color banding to me, probably 16-bit color (not per channel, I mean total). Did you save it as AVI file with one of the MS codecs?

 

Try the Lagarith codec, it's free, lossless, and makes great compression nonetheless, plus also can support Alpha and Null frames (I'd stay away from Nullframes though unless you've tested that all your other tools know how to handle them).

 

I'd be happy to convert it to Xvid (lossy) or Lagarith for you if you post the anim but chances are it's not going to recover, if indeed it is in 16bit now. Will probably have to re-render it and save to a better codec (same holds for Quicktime and Avi, any compressor), or save as image sequence such as 24-bit BMP or Png, Tiff or Targa.

-Philip

thebest3d.com - check the latest tutorials (you are here)