HT201290: If QuickTime Player can't open an audio or video file
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Q: My Macbook Pro will not play an "MPEG-4" file I had converted from an MTS file. It says, "QuickTime Player can't open "QA 1 of 5.m ... My Macbook Pro will not play an "MPEG-4" file I had converted from an MTS file. It says, "QuickTime Player can't open "QA 1 of 5.mp4" because the movie's file format isn't recognized." more
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Helpful answers
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Jul 29, 2013 1:26 PM in response to jworley72by Topher Kessler,Try using VLC to play the file: http://www.videolan.org/vlc/index.html
VLC is a popular and very robust media player that has proven over and over to play files that QuickTime and other media players refuse to, or cannot play.