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List of open-source codecs

This is a listing of open-source implementations of media formats—usually called codecs. Many of the codecs listed implement media formats that are restricted by patents and are henceforth not open formats. For example, x264 is a widely used open source implementation of the heavily patent encumbered MPEG-4 AVC media format.

Contents

Video codecs

  • x264 – H.264/MPEG-4 AVC implementation. x264 is not a codec (encoder/decoder); it is just an encoder (it cannot decode video).
  • Xvid – MPEG-4 Part 2 codec, compatible with DivX
  • libvpx – VP8 implementation; formerly a proprietary codec developed by On2 Technologies, released by Google under a BSD-like license in May 2010.[1][2][3][4]
  • FFmpeg codecs – Codecs in the libavcodec library from the FFmpeg project (FFV1, Snow, MPEG-1, MPEG-2, MPEG-4 part 2, MSMPEG-4, WMV2, SVQ1, MJPEG, HuffYUV and others). Decoders in the libavcodec (H.264, SVQ3, WMV3, VP3, Theora, Indeo, Dirac, Lagarith and others).
  • Lagarith – Video codec designed for strong lossless compression in RGB(A) colorspace (similar to ZIP/RAR/etc.)
  • libtheora – A reference implementation of the Theora format, based on VP3, part of the Ogg Project
  • Tarkin – An experimental and now obsolete lossy video codec formerly under development by the Xiph.org Foundation, replaced by Theora
  • dirac-research – A wavelet based codec created by the BBC Research. It is the software reference implementation of Dirac.
  • Schrödinger – A Dirac implementation developed by David Schleef.[5]
  • Huffyuv – Lossless codec from BenRG
  • OpenAVS – Audio Video Standard (AVS) codec with 90% of its patents owned by Chinese companies and government.

Audio codecs

  • FLAC – Lossless compression.
  • LAME – Lossy compression (MP3 format).
  • TooLAME – Lossy compression (MP2 format).
  • Musepack – Lossy compression; based on MP2 format, with many improvements.
  • Speex – Low bitrate compression, primarily voice; developed by Xiph.org.
  • CELT – Lossy compression for low-latency audio communication
  • Opus – The IETF standards-track successor to CELT
  • libvorbis – Lossy compression, implementation of the Vorbis format; developed by Xiph.org.
  • iLBC – Low bitrate compression, primarily voice
  • iSAC – Low bitrate compression, primarily voice; (free when using the WebRTC codebase)
  • TTA – Lossless compression
  • WavPack – Hybrid lossy/lossless
  • Apple Lossless – Lossless compression (MP4)
  • OpenAVS
  • FFmpeg – Codecs in the libavcodec library from the FFmpeg project (e.g. AC-3, AAC, ADPCM, PCM, Apple Lossless, FLAC, WMA, Vorbis, MP2, etc.)
  • FAAD2 – open-source decoder for Advanced Audio Coding. There is also FAAC, the same project's encoder, but it is proprietary (but still free of charge).
  • libgsm – Lossy compression (GSM 06.10)[6]
  • opencore-amr – Lossy compression (AMR and AMR-WB)[7]
  • liba52 – a free ATSC A/52 stream decoder (AC-3)[8]
  • libdca – a free DTS Coherent Acoustics decoder[9]
  • Aften – Lossy compression (AC-3 format).
  • dcaenc – Lossy compression (DTS format).

Text Codecs

(generally used for subtitles/closed captioning)

  • Writ
  • Kate

See also

Portal iconFree software portal

References

  1. ^ "WebM Code – Build Prerequisites". Retrieved 2010-06-02. 
  2. ^ "WebM Downloads". Retrieved 2010-06-02. 
  3. ^ "Introducing WebM, an open web media project". 2010-05-19. Retrieved 2010-05-19. 
  4. ^ "WebM FAQ". 2010-05-19. 
  5. ^ "Schrodinger FAQ". Retrieved 2011-03-05. 
  6. ^ Jutta Degener (2006-03). "GSM 06.10 lossy speech compression". Retrieved 2009-11-04. 
  7. ^ "opencore-amr". 2009-09-18. Retrieved 2009-11-04. 
  8. ^ "liba52 – a free ATSC A/52 stream decoder". 2006-10-03. Retrieved 2009-11-04. 
  9. ^ "libdca – a free DTS Coherent Acoustics decoder". 2009-02-19. Retrieved 2009-11-04. 


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