Currently Being ModeratedFeb 20, 2013 11:25 PM (in response to comptalk)
Please - .mp4 is NO Video Format - it's a container (a sort of folder) and can contain Video formats iDVD can use or Can Not use.
Open it with QuickTime-Player
Open Inspector [cmd+I]
• Video Format (Codec) : nnnnnnnnnnnnn
• Frames per second : yy.yy fps
What does they say ?
Yours Bengt W