Mp4 not playing

Discussion in 'Mac Basics and Help' started by OceansideMacNW, Jul 7, 2010.

  1. OceansideMacNW macrumors newbie

    Jul 7, 2010
    My Mac won't automatically play an mp4. It comes up with an error message saying "This movie could not be opened. This is not a movie file:. What am I missing? I understand it should just automatically play...
  2. spinnerlys Guest


    Sep 7, 2008
    forlod bygningen
    With what player(s) are you trying to play it?

    Maybe open it in VLC and press CMD+I and see what it says under CODEC DETAILS and post them here.

    Also how big is the file in MB or KB? And where did you get it from? And do all .m4 files not play or just this one (or some others)?
  3. HBOC macrumors 68020

    Oct 14, 2008
  4. OceansideMacNW thread starter macrumors newbie

    Jul 7, 2010
    I am actually trying to play it from the web. I downloaded it and now it plays great. Sorry to waste your time :(

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