This is what YouTube recommend, but I've always ignored it and used an H264 iPod-compatible MP4 file exported from Quicktime/FCP/iMovie. But today the MP4 file I uploaded had an audio sync problem, so I thought I'd try DivX instead. I transcoded my MP4 to DiVX, and uploaded it - and YouTube transcoded it to Flash with better picture quality than the MP4 that I'd tried to upload earlier. Same resolution, same data rate, same size, but better quality in YouTube. Worth knowing.
Rupert http://twittervlog.tv
