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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.
The original WMA codec, known simply as WMA, was conceived as a competitor to the popular MP3 and RealAudio codecs. [2] [3] WMA Pro, a newer and more advanced codec, supports multichannel and high-resolution audio. [4] A lossless codec, WMA Lossless, compresses audio data without loss of audio fidelity (the regular WMA format is lossy). [4]
Customers could download music in a closed-source digital rights management (DRM)-restricted form of 128 kbit/s AAC (see FairPlay) via the iTunes Store or create files without DRM from their own CDs using iTunes. In later years, Apple began offering music videos and movies, which also use AAC for audio encoding.
An audio conversion app (also known as an audio converter) transcodes one audio file format into another; for example, from FLAC into MP3. It may allow selection of encoding parameters for each of the output file to optimize its quality and size.
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.
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.
Fraunhofer FDK AAC – Lossy compression (AAC) FFmpeg codecs in the libavcodec library, e.g. AC-3, AAC, ADPCM, PCM, Apple Lossless, FLAC, WMA, Vorbis, MP2, etc. FAAD2 – open-source decoder for Advanced Audio Coding. There is also FAAC, the same project's encoder, but it is proprietary (but still free of charge). libgsm – Lossy compression
It can convert audio to MP3, WMA, WAV, FLAC, AAC, M4A, and OGG, and can prepare files for playback on various portable media players, such as Zune, Coby, SanDisc, Sansa, iRiver, Walkman, Archos, and GoGear. It can convert audio files into M4A and M4R files for iPad, iPhone, and iPod and automatically adds converted files to the iTunes library.
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