I was curious why you guys are using HuffYUV instead of Lagarith. Lagarith gives both better compression (a smaller file) plus it is better quality. I was just testing three of the more popular lossless codecs, HuffYUV, Lagarith, and MSU, and Lagarith won hands down. MSU produces an even smaller file with no noticable difference in quality bewteen Lagarith and MSU, but MSU is really slow (for 550 frames it took about 12 minutes). The only down side is that Lagarith is slightly slower than HuffYUV. But when it comes to quality and size I would think you would be willing to sacrifice a bit of speed.