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M4A is a file extension for an audio file encoded with advanced audio coding (AAC) which is a lossy compression. It stands for MPEG 4 Audio. They're most often found in Apple's iTunes Store as the format of song downloads.

1 vote

Why I cannot play M4A audio on iTunes, but I can play it on QuickTime?

Try changing the extension from M4A to MP4. It worked for me. …
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