Many of you must have encountered problems with video formats not being compatible either to your portable player or media player and hence you cant transfer it from one media to another. For doing that you normally need a video format converter. There are rarely some good converters which can convert any format to another ( paid ones included). Handbrake is one of those good converters and that too without a price tag.
HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows.