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Revision as of 15:55, 11 September 2006 by Pepoluan (talk | contribs) (Category:Container Formats)
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M4A is a file extension created by Apple Computer to distinguish MPEG4 files containing audio-only from files containing audio+video.

The container format is identical to MP4. Or, put in another way, it's an .MP4 with only an audio stream renamed to .M4A.