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.