Whats a free batch video converter?

Im looking for a free batch video that can transcode avi’s and mp4’s to the iTunes mov. The simpler the better. I just need to convert all of Firefly to watch on my iPod. And yes I know it ruins it but there are times when I feel the need.

http://en.wikipedia.org/w/index.php?title=Firefly_(TV_series)&oldid=330667968