HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows.

Screenshots

Supported Sources:

• Most common multimedia files that libavformat and libavcodec support.


• Any DVD or Bluray-like source which is NOT copy-protected. (removal of copy protection is not supported)

Outputs:

• File format: MP4(M4V) and MKV


• Video: H.264(x264), MPEG-4(ffmpeg), MPEG-2(ffmpeg), or Theora(libtheora)


• Audio: AAC, CoreAudio AAC/HE-AAC (OS X Only), MP3, Flac, AC3, or Vorbis. AC-3, DTS, DTS-HD, AAC and MP3 pass-thru

Misc features:

• 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 and Filters: Deinterlacing, Decomb, Detelecine, Deblock, Grayscale Cropping and scaling


• Live Video Preivew


• Built-in presets for common devices

Credits

HandBrake uses a lot of (L)GPL libraries from the Linux world: Here