Quicktime Player - won't play movie

I have a movie file which works on my old 10.6 Snow Leopard machine (it's a m4v file), but Quicktime player under 10.8 refuses to play it. Whenever I try to open it, it complains of a missing codec (but doesn't state what). However I can watch the preview in Quicklook. If I try to watch it in VLC, the sound comes out all distorted and sounds like something from the 80s, while the 10.6 machine plays it nicely.
I've tried to copy it via various methods incase it's getting corrupted in transit, but I get the same result.
Any tips or recomendations for a movie player that might play this file?

Hi Sam,
.m4v is the format and codec is the component / resource used build the movie i.e m4v is a box that is carrying the movie and the movie was created using codec like MPEG or MPEG2 or H264 and so on...
http://perian.org try to get this App or http://mplayerx.org/download.html, try to update your VLC player....
Good luck...

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