If not, then a few 4 digit sequences getting bombed from a power flicker will....particularly as it usually happens about 3/4ths the way through the job... Or the completed job done with DivX, and the compression ratio being one of the magic 'you shouldn't have done that' numbers that turns the output into a mosaic wonderland. Rendering to codec is an excellent feature for outputting a quick and dirty test strip to see about scene integrity....but for final output, it just doesn't provide the consistent quality you need.