Unless you have some particular reason to be working in AVI, (which is generally uncompressed), why not work instead in mpg2 if that is available to you. I try to obtain the best image-quality possible and generally use a variable sampling-rate based upon a scan-rate of 9800, with 'two-stage' renders, the first to tee-up the optimum quality for the second which is the actual 'render' itself. I have usually been so satisfied with the outcomes that I have no wish to change to Hi-Def. If you change to mpg2, and your original material is 'avi', (I'm assuming DV-AVI input), your original footage remains unchanged and of 'camcorder' quality. The process, then, is non-destructive, and if you don't like the outcomes from the change, the original footage is not compromised. At all costs, don't over-write your original footage.
