Does anyone have a good (preferably free) program that will do this? I've been working on some silly projects in Sony Vegas recently and have been wanting to use some avi's, but you can't do anything with them in vegas. I would also be happy if it was anything but avi...like a .mov or .midi or ... anything.

EDIT: I've been using YASA for videos under 5 minutes, but for longer clips, it's not as useful.