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Linear pulse-code modulation (LPCM, generally only described as PCM) is the format for uncompressed audio in media files and it is also the standard for CD-DA; note that in computers, LPCM is usually stored in container formats such as WAV, AIFF, or AU, or as raw audio format, although not technically necessary.
A lossless audio coding format reduces the total data needed to represent a sound but can be de-coded to its original, uncompressed form. A lossy audio coding format additionally reduces the bit resolution of the sound on top of compression, which results in far less data at the cost of irretrievably lost information.
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. 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.
They continued refining the source code until the Vorbis file format was frozen for 1.0 in May 2000. [2] [3] [18] Originally licensed as LGPL, in 2001 the Vorbis license was changed to the BSD license to encourage adoption, with the endorsement of Richard Stallman. [19] [20] A stable version (1.0) of the reference software was released on July ...
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.
The first version of the codec released in 1999 is regarded as WMA 1. In the same year, the bit stream syntax, or compression algorithm , was altered in minor ways and became WMA 2. [ 12 ] Since then, newer versions of the codec have been released, but the decoding process remained the same, ensuring compatibility between codec versions. [ 12 ]
MPEG Program Stream (MPEG-1 Part 1 (essentially identical) and MPEG-2 Part 1) 00 00 01 B3 ␀␀␁³: 0 mpg mpeg MPEG-1 video and MPEG-2 video (MPEG-1 Part 2 and MPEG-2 Part 2) 66 74 79 70 69 73 6F 6D: ftypisom: 4 mp4 ISO Base Media file (MPEG-4) 66 74 79 70 4D 53 4E 56: ftypMSNV: 4 mp4 MPEG-4 video file 78 01: x␁ 0 zlib No Compression (no ...
WavPack also incorporates a "hybrid" mode, which still provides the features of lossless compression, but creates two files: a relatively small, high-quality, lossy file (.wv) that can be used by itself; and a "correction" file (.wvc) that, when combined with the lossy file, provides full lossless restoration.