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QuickTime Player can't open/play .mp4 file

Hi,


I have created an export from imovie. The video and audio both display in imovie, but once exported QuickTime player won't allow me to open/view/play the file (as below). I have tried on both my macbook pro and mac desktop. When i click the message 'tell me more' it seems to state it is out of date. But i have no idea how to fix this. Can i play the file? User uploaded file


Please help!


Thanks,


Sam.

iMac

Posted on Sep 22, 2018 4:30 AM

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QuickTime Player can't open/play .mp4 file

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