|visits||member for||2 years, 4 months|
|seen||Dec 18 '13 at 8:43|
Can I manually change an .mp4 to .m4v by changing the extension in the Finder (mac) or explorer (win)?
Why don't you try it and see if it works? This suggests it could work: forums.macrumors.com/showthread.php?t=441377
Video file playback issue
Are you looking to just play the file or edit the file so that it can be played?