I have some M4A audio files, that I can't play on iTunes (e.g. double click the file, and then iTunes fired up, the audio added to the library, but the play doesn't start. Tried double clicking on the audio on the library, still doesn't start the player).

But when I open them in QuickTime, QuickTime can play it. Why that happens? And what can I do about it so I can import those files to iTunes? Thanks.

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    Where did the .m4a file come from? I'd like to see the first 30 bytes of the file, so in a Terminal do the following. Type cat , that's "cat " followed by a space. Now drag & drop the .m4a file onto the Terminal window and it populates the command line with its fully qualified pathname. Now type | head -c 30 | xxd -p and press enter. The output will be in hex format, e.g.: 00000020667479704d344120000000004d3441206d70343269736f6d0000 – user3439894 Jul 7 '16 at 14:58
  • it's solved now. turns out the file is corrupt, not in the correct size. as far as I know, iTunes should be able to play it though even though when it's incomplete. thanks. – Chen Li Yong Jul 9 '16 at 5:29

Changing the extension to .mp4 from .m4a worked for me but as a solution sucks since I now have to change it for each file individually. With a large music collection failing the same way this solution with take significant time to implement.

  • Welcome to Ask Different. Please refrain from adding comments in the Answer section. This is for answers to the questions only. If you have a different question, you can ask it by clicking Ask Question. You can also add a bounty to draw more attention to this question once you have enough reputation. See How to Ask for more info on how to ask a question. - From Review – fsb May 17 '18 at 19:27
  • jjackson thanks, I'll keep in mind about renaming the extension. in my case, after some investigation, the file is actually corrupt from the source. – Chen Li Yong May 18 '18 at 9:30

I had the same problem. Try changing the extension from M4A to MP4. It worked for me.

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