Quicktime 7.5.5 Cant Play AVC 1 files

I got this movie that i try to open with quicktime is a mpeg4 file the video codec is avc1 but every time i try to open i got this error message "An invalid public movie atom was found in the movie" can someone help me please to find out if a need a different codec to view this file

I have had the same problem, yet no easy solution from QuickTime. Now, I was able to instantly play my movie using VLC media player. It is a free media player. After installation you open the appl and go to the File menu to "Open" your movie (note: If you just click on the movie file, it will keep on bringing the QT-unable-to-open dialogue). It is unfortunate, indeed, but it seems like we have many types of files which QT does not play at all. Get the free VLC appl at <http://www.videolan.org/vlc/>

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