M4V will not play after the update of the Sierra

I have a number of m4v files that will play is more in quicktime or iTunes after my update for Sierra on my MacBook Pro and iMac. The audio plays fine but the video freezes on the first few frames. I have no problem with those files previously.

Any suggestions please?

I have a similar problem as well. Some of my m4v files appear as a blank page with a folded corner icon. They will not play in anything other than VLC player. When I try to play them in iTunes the move, and he said LIVE. When I move the files to an older operating system (El Capitan), they play and correct appearance.

Tags: Mac OS & System Software

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