Handbrake is an application that converts almost any source(just recently) to any other source, it is multiplatform and multithreaded. It is available for Windows, MacOS X, and Linus.
Inputs included are
– any DVD Source: VIDEO_TS folder, DVD image or real DVD (you have to decrypt your original movies first using 3rd party software)
Outputs supported are
– File Format: MP4, MKV, AVI, or OGM
– Video: MPEG-4, H.264, or Theora
– Audio: AAC, MP3, Vorbis or AC-3 (supports multiple audio tracks)