A Free DVD Video Transcoder For Windows, Mac OS X And Linux

HandBrake is an open-source video transcoder designed to convert MPEG video (including DVD-Video) into an MPEG-4 video file (.mp4) or .mkv containers.

This software is used to convert DVDs into other forms so they can be viewed on iPods, iPhones. It is available for Mac, Windows and Linux.

•  Home page: http://handbrake.fr/

Supported Sources:

• Any DVD-like source: VIDEO_TS folder, DVD image or real DVD (unencrypted--protection methods including CSS are not supported internally and must be handled externally with third-party software and libraries), and some .VOB and .TS files
• Most any multimedia file it can get libavformat to read and libavcodec to decode.

Outputs:

• File format: MP4 and MKV
• Video: MPEG-4, H.264, or Theora
• Audio: AAC, CoreAudio AAC (OS X Only), MP3, or Vorbis. AC-3 pass-through, DTS pass-thorugh (MKV only)

Misc features:

• Chapter selection
• Subtitles
• Integrated bitrate calculator
• Picture deinterlacing, cropping and scaling
• Live Video Preivew 

Core updates of current version 0.9.5  (more)

• BluRay disc structure support. (No decryption support)
• SSA Subtitle support.
• MP3 audio now supported in MP4 files
• VOBSUB subtitle now supported in MP4 files

Download the latest version (0.9.5):  http://handbrake.fr/downloads.php

For Ubuntu Users

sudo add-apt-repository ppa:stebbins/handbrake-releases
sudo apt-get update
sudo apt-get install handbrake-gtk