is an open-source, GPL-licensed,DVD to MPEG-4 converter, available for MacOS X, Linux and Windows.The output supported are;
1. MP4, MKV, AVI or OGM
2.Video :MPEG-4 or H.264
3.Audio: AAC, MP3, Vorbis or AC-3
The biggest difference with the same type of software is a built-in a variety of digital output format (encoding preset setting), you can choose the output iPod, Xbox,PS3, etc,HandBrake will convert the movie according digital device that you choose, automatically converting the output format in line with your digital device needs.
Moreover,HandBrake can be directly embedded subtitles video output, so you no need worry about subtitiles of the movie.
The important thing is Handbrake is a freeware.