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This is a listing of open-source [[codec]]s—that is, [[open-source software]] [[Implementation#Computer science|implementations]] of [[audio coding format|audio]] or [[video coding format]]s, [[audio codec]]s and [[video codec]]s respectively. Many of the codecs listed implement media formats that are restricted by patents and are hence not [[open format]]s. For example, [[x264]] is a widely used open source implementation of the heavily patent encumbered MPEG-4 AVC video compression standard.

== Video codecs ==
*'''[[x264]]''' – [[H.264/MPEG-4 AVC]] implementation. x264 is not a codec (en'''co'''der/'''dec'''oder); it is just an encoder (it cannot decode video).
*'''[[OpenH264]]''' – H.264 baseline profile encoding and decoding
*'''OpenVVC'''<ref>{{Cite web |author1=IETR |url=https://github.com/OpenVVC |title=OpenVVC French VVC Decoder |website=[[GitHub]] |date=2021-09-30 |language=en}}</ref> an [[Versatile Video Coding|VVC /H.266]] [[Real-time computing|Real Time]]-[[Video decoder|Decoder]] for [[Mac OS]], [[Windows]], [[Linux]] and [[Android (operating system)|Android]] and special Version of [[FFmpeg]],<ref>{{Cite web |author1=IETR |url=https://github.com/OpenVVC/FFmpeg|title=Modified FFmpeg for VVC |website=[[GitHub]] |date=2021-09-30 |language=en}}</ref> which was used for [[Ateme]] [[Satellite]] [[Broadcast]] Test.<ref>{{Cite web |url=https://www.ateme.com/ateme-joins-forces-with-ses-to-trial-first-ever-live-over-the-air-uhd-broadcast-using-vvc/ |title=ATEME Joins Forces with SES to Trial First-Ever Live Over-The-Air UHD Broadcast Using VVC – ATEME |date=2020-07-14 |language=en}}</ref><ref>{{Cite web |author1=ouest-valorisation.fr |url=https://www.ouest-valorisation.fr/entreprises/trouver-une-technologie-innovante/tic/logiciel/defense/2021_t_00024-decodeur-video-vvc-temps-reel/ |title=DÉCODEUR VIDÉO VVC TEMPS RÉEL |date=2021-09-30 |language=fr}}</ref>
*'''[[x265]]''' – An encoder based on the [[High Efficiency Video Coding]] (HEVC/H.265) standard.
*'''[[Xvid]]''' – [[MPEG-4 Part 2]] codec, compatible with [[DivX]]
*'''[[libvpx]]''' – [[VP8]] and [[VP9]] implementation; formerly a proprietary codec developed by [[On2 Technologies]], released by Google under a BSD-like license in May 2010.
*'''SVT-AV1''' – An [[AV1]] encoder originally developed by [[Intel]] and [[Netflix]], which is available as [[FOSS]] now.<ref>{{Cite web|url=https://newsroom.intel.com/news/intel-netflix-deliver-av1-scalable-codec-power-next-gen-compression-tech-visual-workloads/|title = Intel, Netflix to Deliver AV1 Scalable Codec to Power Next-Gen Compression Tech for Visual Workloads}}</ref> SVT-AV1 is generally considered to be the most optimized and fastest free AV1 encoder, which is why it serves as the base for the development of new, free, general-purpose and production-ready implementations in the ''AOMedia Software Implementation Working Group''.<ref>{{cite news | url=http://aomedia.org/press%20releases/aomedia-software-implementation-working-group-to-bring-av1-to-more-video-platforms/ | title=AOMedia Software Implementation Working Group to Bring AV1 to More Video Platforms | newspaper=Alliance for Open Media | date=20 August 2020 }}</ref> While SVT-AV1 already performs very well in constrained quality mode and is economically usable for many scenarios, as of the time being commercial implementations like Aurora1 may still beat it.<ref>{{Cite web|url=https://www.streamingmedia.com/Articles/ReadArticle.aspx?ArticleID=142941|title = AV1 Has Arrived: Comparing Codecs from AOMedia, Visionular, and Intel/Netflix|date = 18 September 2020}}</ref>
*'''[[VideoLAN]] [[dav1d]]''' – An [[AV1]] decoder for decoding videos with AV1 codec
*'''[[Xiph.Org]] [[rav1e]]''' – An [[AV1]] encoder written in [[Rust (programming language)|Rust]]
*'''[[Google]] [[libgav1]]''' – An [[AV1]] decoder by Google
*'''[[xvc]]''' – An open source video codec, aiming to compete with [[h.265]] and [[AV1]]. The reference implementation is released under the [[LGPL 2.1]] and currently available in version 2.0 (as of 12/2020)<ref>{{cite web |url=https://xvc.io/ |title=XVC |access-date=2024-01-11}}</ref>
*'''[[FFmpeg]] codecs''' – Codecs in the [[libavcodec]] library from the FFmpeg project ([[FFV1]], [[Snow (codec)|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
*[[Dirac (codec)|Dirac]] as '''dirac-research''', a [[wavelet]] based codec created by the [[BBC Research]], and '''Schrödinger''', an implementation developed by David Schleef.<ref name="libschrodinger">{{cite web|url=http://diracvideo.org/schrodinger-faq/|title=Schrodinger FAQ|access-date=2011-03-05|archive-url=https://web.archive.org/web/20101017224058/http://diracvideo.org/schrodinger-faq/|archive-date=2010-10-17|url-status=usurped}}</ref>
*'''[[Huffyuv]]''' – [[Lossless]] codec from BenRG
*'''[[Daala]]''' – Experimental [[Video codec]] which was under development by the [[Xiph.Org Foundation]] and finally merged into [[AV1]].
*'''[[Thor (video codec)|Thor]]''' – Experimental royalty free video codec which was under development by [[Cisco Systems]], and merged technologies into [[AV1]].
*'''Turing''' – A [[High Efficiency Video Coding]] (HEVC/H.265) encoder implemented by [[BBC Research]].
*'''[[AV1#Software implementations|libaom]]''' – [[Reference implementation]] for the royalty free [[AV1]] video coding format by [[AOMedia]], inheriting technologies from [[VP9]], [[Daala]] and [[Thor (video codec)|Thor]].
*'''[[Kvazaar]]''' – An academic open-source encoder based on the [[High Efficiency Video Coding]] (HEVC/H.265) standard.
*'''UVG266''' academic [[open-source]] [[Versatile Video Coding|VVC/H.266]] encoder based on [[Kvazaar]].<ref>{{cite web |url=https://github.com/ultravideo/uvg266 |title=UVG266 |access-date=2024-01-11}}</ref> (on [[BSD licenses#3-clause license ("BSD License 2.0", "Revised BSD License", "New BSD License", or "Modified BSD License")|3 Clause BSD License]] for [[Linux]]/[[Windows]]/[[macOS]], and in Development)
*'''VVenC''' & '''VVdeC''' – An open-source encoder and decoder released by [[Fraunhofer HHI]] based on the [[Versatile Video Coding|Versatile Video Coding (VVC/H.266)]] standard available on GitHub.
*XEVE (the eXtra-fast Essential Video Encoder) '''MPEG-5 Part 1: [[Essential Video Coding]]'''
*XEVD (the eXtra-fast Essential Video Decoder) '''MPEG-5 Part 1: [[Essential Video Coding]]'''
*'''REVC''' – a [[Rust (programming language)|Rust]]-based '''MPEG-5 Part 1: [[Essential Video Coding]]''' baseline encoder and [[Video decoder|decoder]].<ref>{{cite web |title=The fastest and safest EVC encoder and decoder |website=[[GitHub]] |url=https://github.com/revcx/revc |accessdate=26 August 2020}}</ref>

== Audio codecs ==
* '''[[FLAC]]''' – Lossless codec developed by Xiph.Org Foundation.
* '''[[LAME]]''' – Lossy compression (MP3 format).
* '''[[TooLAME]]/[[TooLAME#TwoLAME|TwoLAME]]''' – Lossy compression (MP2 format).
* '''[[Musepack]]''' – Lossy compression; based on MP2 format, with many improvements.
* '''[[Speex]]''' – Low bitrate compression, primarily voice; developed by Xiph.Org Foundation. Deprecated in favour of Opus according to www.speex.org.
* '''[[CELT]]''' – Lossy compression for low-latency audio communication
* '''libopus''' – A reference implementation of the [[Opus (audio format)|Opus]] format, the IETF standards-track successor to CELT. (Opus support is mandatory for [[WebRTC]] implementations.)
* '''[[libvorbis]]''' – Lossy compression, implementation of the [[Vorbis]] format; developed by Xiph.Org Foundation.
* '''[[iLBC]]''' – Low bitrate compression, primarily voice
* '''[[internet Speech Audio Codec|iSAC]]''' – Low bitrate compression, primarily voice; (free when using the WebRTC codebase)
* '''TTA''' – Lossless compression
* '''[[WavPack]]''' – Hybrid lossy/lossless
* '''Bonk''' – Hybrid lossy/lossless; supported by [[fre:ac]] (formerly BonkEnc)
* '''[[Apple Lossless]]''' – Lossless compression (MP4)
* '''[[Fraunhofer FDK AAC]]''' – Lossy compression (AAC)
* '''FFmpeg''' codecs in the ''[[libavcodec]]'' library, e.g. AC-3, AAC, ADPCM, PCM, Apple Lossless, FLAC, [[Windows Media Audio|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 [[freeware|free of charge]]).
* '''[[libgsm]]''' – Lossy compression ([[GSM 06.10]])
* '''opencore-amr''' – Lossy compression ([[Adaptive Multi-Rate audio codec|AMR]] and AMR-WB)
* '''[[liba52]]''' – a free [[ATSC A/52]] stream decoder (AC-3)
* '''[[libdca]]''' – a free DTS Coherent Acoustics decoder
* '''[[Codec2]]''' – Low bitrate compression, primarily voice

== See also ==
{{Portal|Free and open-source software}}
*[[List of codecs]]
**[[Comparison of video codecs]]
**[[Comparison of audio coding formats]]
*[[Comparison of video player software]]
*[[Comparison of audio player software]]
*[[Open file format]]

==References==
{{Reflist}}

{{Compression Software Implementations}}
{{Compression formats}}

[[Category:Free codecs| ]]
[[Category:Free software lists and comparisons|Codecs]]

List of open-source codecs - Revision history

imported>Kvng: format bare refs as requested