M4A appears for MPEG 4 Sound and is a filename expansion used to signify music.
The lifestyle of two different filename additions, .MP4 and .M4A, for identifying audio-only MP4 data files has been a source of misunderstandings among customers and multi-media play-back application. Some data file supervisors, such as Windows Traveler, look up the press kind and associated programs of a data file depending on its filename expansion. But since MPEG-4 Part 14 is a package structure, MPEG-4 data files may contain any number of audio, movie, and even subtitle sources, making it difficult to figure out the kind of sources in an MPEG-4 data file depending on its filename expansion alone. In reaction, The apple company Inc. started using and making popular the .m4a filename expansion, which is used for MP4 bins with audio data in the lossy Innovative Sound Programming (AAC) or its own lossless The apple company Lossless (ALAC) types. Software able of audio/video play-back should identify data files with either .m4a or .mp4 filename additions, as would be predicted, since there are no data structure variations between the two. Most application able of developing MPEG-4 audio will allow the customer to choose the filename expansion of the designed MPEG-4 data files.
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