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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.
On2 Technologies TrueMotion VP3/VP4, VP5, VP6, VP7; under the name The Duck Corporation: TrueMotion S, TrueMotion 2, TrueMotion RT 2.0 FFmpeg (decoder only) RealVideo 1, G2, 8, 9 and 10 FFmpeg; RealMedia HD SDK; RealVideo Fractal Codec (a.k.a. Iterated Systems ClearVideo) FFmpeg (decoder only) RealMedia HD (a.k.a. RealVideo 11 or RV60 ...
In 1996 Eric Kemp [clarification needed] proposed adding a 128-byte suffix to MP3 files, which would store useful information such as an artist's name or a related album title. Kemp deliberately placed the tag data (which is demarcated with the 3-byte string TAG ) at the end of the file as it would cause a short burst of static to be played by ...
As such, the user normally doesn't have a raw AAC file, but instead has a .m4a audio file, which is a MPEG-4 Part 14 container containing AAC-encoded audio. The container also contains metadata such as title and other tags, and perhaps an index for fast seeking. [2] A notable exception is MP3 files, which are raw audio coding without a ...
MDCT, [67] Lossy (incorporates elements of Siren Codec and Ericsson technology) 48 kHz 32–88 kbit/s in 4 kbit/s steps, 88–128 kbit/s in 8 kbit/s steps 16 bit 40 ms Yes No Yes: only in MPEG-4 Part 12 container: Yes: only in MPEG-4 Part 12 container: G.721: ADPCM, Lossy: 8 kHz 32 kbit/s 13 bit Yes No No No G.722: sub-band ADPCM, Lossy: 16 kHz ...
The ID3v1 series, in particular, stores genre as an 8-bit number (therefore ranging from 0 to 255, with the latter having the meaning of "undefined" or "not set"), allowing each file to have at most one genre out of a fixed list. Genre definitions 0-79 follow the ID3 tag specification of 1999. [1]
Audio file icons of various formats. An audio file format is a file format for storing digital audio data on a computer system. The bit layout of the audio data (excluding metadata) is called the audio coding format and can be uncompressed, or compressed to reduce the file size, often using lossy compression.
While MS-DOS and NT always treat the suffix after the last period in a file's name as its extension, in UNIX-like systems, the final period does not necessarily mean that the text after the last period is the file's extension. [1] Some file formats, such as .txt or .text, may be listed multiple times.