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For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint. First public release date is first of either specification publishing or source releasing, or in the case of closed-specification, closed-source codecs ...
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 ...
MP3: Lossy: 1991-12 Expired patents [88] Yes Yes MPEG-1 Audio Yes Yes [β] Yes Yes No No AC-3: Lossy: 1991-02 Expired patents Yes Yes [91] Yes Yes Yes Yes Private No No E-AC-3: Lossy: 2005-02 Patent encumbered QuickTime [γ] Yes Yes Yes No No No No No DTS: Lossy: 1993-06 Proprietary: Yes Yes No Yes Yes No Private No No WMA: Lossy: 1999-08 ...
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.
ALAC data is frequently stored within an MP4 container with the filename extension.m4a. This extension is also used by Apple for lossy AAC audio data in an MP4 container (same container, different audio encoding). The codec can also be used by the .CAF file type container, though this is much less common.
The following comparison of audio players compares general and technical information for a number of software media player programs. For the purpose of this comparison, "audio players" are defined as any media player explicitly designed to play audio files, with limited or no support for video playback.
mp3PRO vs MP3 Archived 2017-02-02 at the Wayback Machine - includes graphs comparing high-frequency performance for MP3pro (similar to HE-AAC+) Official MPEG web site; Via Licensing Corporation - HE-AAC Patent Pool; RFC 4281 - The Codecs Parameter for "Bucket" Media Types; Fraunhofer AAC Test Site
A comparison of sizes for the Microcassette and Minicassette Analog, 1 ⁄ 8 inch wide tape, used generally for note taking, mostly mono, some stereo (developed in the early '80s). 2.4 cm/s or 1.2 cm/s Minicassette: Analog, 1 ⁄ 8 inch wide tape, used generally for note taking, 1.2 cm / s: 1970 Quadraphonic 8-Track (Quad-8) (Q8)