Videos no longer recognized by MacBook Pro

A novice here.  I have home videos that used to work (.m4v and .mkv) but they no longer do.  The size appears to be what they always were (4.12+ GB) but the icon is now solid white and is no longer recognized by anything (QuickTime, Preview, etc.).  Can you help me?  Thanks!!!

Get VLC for those videos. Works fine in ML.
Your Perian is probably broken.

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