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This is a listing of open-source codecs—that is, open-source software implementations of audio or video coding formats, audio codecs and video codecs respectively. Many of the codecs listed implement media formats that are restricted by patents and are hence not open formats.
Some features are only supported by a few containers: Attachments (additional files, such as fonts for subtitles) are only supported in Matroska, [41] MP4 and QTFF. M2TS supports attachments as multiple files in a specific file structure: fonts for subtitles are in .otf files in the /BDMV/AUXDATA/ directory.
Those codecs are used by many PC games which use voice chats via Microsoft ... CD+G (CD+Graphics) codec FFmpeg (decoder only) VLC (decoder only) CD+EG (CD+Extended ...
VLC media player: supports playback and encoding of MP4 and raw AAC files; Winamp for Windows: includes an AAC encoder that supports LC and HE AAC; Windows Media Player 12: released with Windows 7, supports playback of AAC files natively; Another Real: Rhapsody supports the RealAudio AAC codec, in addition to offering subscription tracks ...
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 ...
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
Internet low Bitrate Codec 13.33 or 15.2 kbit/s RFC 3952 dynamic PCMA-WB audio 1 16000 5 ITU-T G.711.1 A-law RFC 5391 dynamic PCMU-WB audio 1 16000 5 ITU-T G.711.1 μ-law RFC 5391 dynamic G718 audio 32000 (placeholder) 20 ITU-T G.718: draft-ietf-payload-rtp-g718: dynamic G719 audio (various) 48000 20 ITU-T G.719: RFC 5404 dynamic G7221 audio ...
The MP4 file format defined some extensions over the ISO Base Media File Format to support MPEG-4 visual/audio codecs and various MPEG-4 Systems features such as object descriptors and scene descriptions. Some of these extensions are also used by other formats based on the ISO base media file format (e.g., 3GP). [1]