Software:libavcodec
| Developer(s) | FFmpeg team |
|---|---|
| Stable release | 60.31.102 (included in FFmpeg 6.1.1)[1] (December 31, 2023) [±] |
| Written in | C99 |
| Operating system | Available for Windows, OS X, Linux but may be compiled for any other OS[2] |
| Platform | Available for x86 but may be compiled for any desktop computer or supercomputer |
| Type | Multimedia Library |
| License | GNU LGPL 2.1+ or GNU GPL 2+ or non-redistributable if compiled as such[3] |
| Website | ffmpeg |
libavcodec is a free and open-source[4] library of codecs for encoding and decoding video and audio data.[5]
libavcodec is an integral part of many open-source multimedia applications and frameworks. The popular MPV, xine and VLC media players use it as their main, built-in decoding engine that enables playback of many audio and video formats on all supported platforms. It is also used by the ffdshow tryouts decoder as its primary decoding library. libavcodec is also used in video editing and transcoding applications like Avidemux, MEncoder or Kdenlive for both decoding and encoding.
libavcodec contains decoder and sometimes encoder implementations of several proprietary formats, including ones for which no public specification has been released. As such, a significant reverse engineering effort is part of libavcodec development. Having such codecs available within the standard libavcodec framework gives a number of benefits over using the original codecs, most notably increased portability, and in some cases also better performance, since libavcodec contains a standard library of highly optimized implementations of common building blocks, such as DCT and color space conversion. However, while libavcodec does strive to achieve decoding that is bit-exact to their official format implementations, occasional bugs and missing features in such re-implementations can sometimes introduce playback compatibility problems for certain files.
Implemented video codecs
libavcodec includes video decoders and/or encoders for the following formats, this list is not exhaustive:[6]
Implemented audio codecs
libavcodec includes decoders and encoders for the following formats:[6]
Legal aspects
Libavcodec contains more than 100 codecs,[8] most of which do not just store uncompressed data. Most codecs that compress information could be claimed by patent holders.[9] Such claims may be enforceable in countries like the United States which have implemented software patents, but are considered unenforceable or void in countries that have not implemented software patents.
Furthermore, many of these codecs are only released under terms that forbid reverse engineering, even for purposes of interoperability. These terms of use are forbidden in certain countries. For example, some European Union nations have not implemented software patents and have laws expressly allowing reverse engineering for purposes of interoperability.[10]
Libraries that depend on libavcodec
- libavformat (part of FFmpeg)
- libgegl (optional part of GEGL)
- libgimp (part of GIMP)
- libmpcodecs (part of MPlayer)
- libmpdemux (part of MPlayer)
Applications using libavcodec
Video players
Audio players
- Audacious (Uses in audacious-plugins's ffaudio)
- Rockbox (Includes only FLAC code)
- XMMS2
Multimedia players
Video editors
Audio editors
Video converters
Video libraries
Optical disc authoring
Graphics libraries
3D graphics editors
VoIP
Multimedia streaming server
Multimedia frameworks
- ffdshow (wraps libavcodec as a DirectShow filter and adds postprocessing to improve image quality; once installed, it is automatically used by all Windows DirectShow video players, such as Windows Media Player, Media Player Classic, Winamp etc. It also wraps libavcodec as a Video for Windows filter; the framework used by most video editing software.)
- LAV Filters
- GStreamer via the GStreamer FFmpeg plugin
- Perian
- Bellagio OpenMAX Integration Layer – open-source OpenMAX IL API implementation
Computer vision libraries
Browser
Media center
Screen capture
- xvidcap[16]
Device utilities
- BitPim – utilities for CDMA phones
CCTV
- ZoneMinder – video camera security suite
- Motion – video camera security/monitoring program
Games
Others
- CorePlayer
- FreeJ
- Ingex Studio – used by BBC
- PulseAudio – includes only resamplers code[17]
- Steam digital distribution service
References
- ↑ [1]
- ↑ "Download". ffmpeg.org. FFmpeg. http://ffmpeg.org/download.html.
- ↑ libavcodec can be configured to make it a proprietary and non-redistributable library since some optional external libraries are proprietary software and cannot be distributed under the terms of the GPL (e.g. Decklink).
- ↑ "Libav License and Legal Considerations". libav.org. http://www.libav.org/legal.html.
- ↑ libavcodec – AfterDawn: Glossary of technology terms & acronyms, AfterDawn, 2010-07-02, http://www.afterdawn.com/glossary/terms/libavcodec.cfm, retrieved 2012-01-17
- ↑ 6.0 6.1 General Documentation, Ffmpeg.org, http://www.ffmpeg.org/general.html#SEC6, retrieved 2021-05-05
- ↑ "git.ffmpeg.org Git - ffmpeg.git/commit". https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/301ed950d1c3c500d0c2eee8472587dc5e691c04.
- ↑ "Codecs list". ffmpeg.org. http://ffmpeg.org/general.html#SEC8.
- ↑ "Legal information on FFmpeg's website". ffmpeg.org. http://ffmpeg.org/legal.html.
- ↑ Council Directive 91/250/EEC of 14 May 1991 on the legal protection of computer programs
- ↑ Wieckowski, Adam; Lehmann, Christian; Bross, Benjamin; Marpe, Detlev; Biatek, Thibaud; Raulet, Mickael; Jean Le Feuvre (2021). "A Complete End to End Open Source Toolchain for the Versatile Video Coding (VVC) Standard". Proceedings of the 29th ACM International Conference on Multimedia. pp. 3795–3798. doi:10.1145/3474085.3478320. ISBN 9781450386517.
- ↑ Gumster, Jason van (13 April 2009), Blender for Dummies, Wiley, p. 320, ISBN 9780470471586, https://books.google.com/books?id=OaAl4PdZs5EC&q=Blender+ffmpeg&pg=PT332, retrieved 2012-01-17
- ↑ Bradski, Gary; Kaehler, Adrian (2008-09-24), Learning OpenCV: computer vision with the OpenCV library, "O'Reilly Media, Inc.", p. 9, ISBN 9780596554040, https://books.google.com/books?id=seAgiOfu2EIC&q=libavcodec&pg=PA9, retrieved 2012-01-17
- ↑ whatwg MPEG-1 subset proposal for HTML5 video codec, Lists.whatwg.org, http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2009-May/020001.html, retrieved 2012-01-17
- ↑ "Firefox Source Code Libavcodec". https://hg.mozilla.org/mozilla-central/file/tip/media/ffvpx/libavcodec.
- ↑ Russo, Barbara; Damiani, Ernesto; Hissam, Scott; Lundell, Björn; Succi, Giancarlo (17 July 2008), Open Source Development, Communities and Quality: IFIP 20th World Computer, Springer, p. 167, ISBN 9780387096834, https://books.google.com/books?id=lfVAJe6El1IC&q=avidemux_libavcodec&pg=PT167, retrieved 2012-01-17
- ↑ pulseaudio.git/tree – src/pulsecore/ffmpeg/, Git.0pointer.de, http://git.0pointer.de/?p=pulseaudio.git;a=tree;f=src/pulsecore/ffmpeg, retrieved 2012-01-17
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