I use the Huffyuv codec on my PC for all of my post-production work. It's a lossless avi codec and is a much better alternative than doing everything without compression. After I'm happy with my edits, I convert to MPEG 1 or 2, or Flash depending on where I'm distributing... There's a lot of good info in Avery Lee's VirtualDub program's help file about video compression. I would read it, and here's some links- Huffyuv- http://www.math.berkeley.edu/~benrg/huffyuv.html VirtualDub links (codecs and what-not)- http://www186.pair.com/vdub/links