HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder .

• 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.

• 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)

• Chapter selection, Chapter Markers
• Subtitles
  • Vobsub and Closed Captions
  • SRT import and passthru
  • SSA passthru or burn-in (experimental)
• Constant Quality or Average Bitrate Video Encoding
• Support for VFR, CFR and VFR
• Video: Deinterlacing, Decomb, Detelecine, Cropping and scaling
• Live Video Preivew