HT201290: If QuickTime Player can't open an audio or video file

Learn about If QuickTime Player can't open an audio or video file
stevekerr101

Q: Downloaded an .mp4 file and for some reason it says...

I downloaded an .mp4 file and for some reason it says...

 

The document “dail 2.mp4” could not be opened. The movie's file format isn't recognized.

 

WHY?? It always plays mp4 for me.

MacBook Pro, Mac OS X (10.7.5)

Posted on Apr 13, 2014 10:18 AM