HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows.
HandBrake is a video transcoder that takes your movies and transfers them to a format that's useful on your computers, media centers, and portable electronic devices. It converts most any video formats to a handful of modern ones.
What's new in this version:
Version 0.9.8 fixes some bugs that cropped up with 0.9.7. This includes all the previous fixes for 0.9.6 including the new AppleTV3 preset and updated iPad preset.