http://handbrake.fr/downloads.php works on Win, Lin and OS X, based on ffmpeg
HandBrake - Muti-platform open source video transcoderJanuary 4, 2011 · Linux, encoding, ffmpeg, h.264, mac, opensource, video, videoediting, windows · 1 minhttp://handbrake.fr/downloads.phpworks on Win, Lin and OS X, based on ffmpeg