HandBrake is a multiplatform, multithreaded video transcoder. Supported sources: Any DVD-like source: VIDEO_TS folder, DVD image or real DVD, and some .VOB and .TS files, Blu-ray source, Most any multimedia file it can get libavformat to read and libavcodec to decode. Outputs: File format: MP4, MKV, Video: MPEG-4, H.264, or Theora (1 or 2 passes or constant quantizer/rate encoding), Audio: AAC, MP3, Vorbis or AC-3 pass-through (supports encoding of several audio tracks), Switchable or burned in subtitles and much more!
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