Why won't MVI movie files sync to iPad?

I sync home photos and movies between my iMac and iPad. I first take pictures & videos with a camera, download into iPhoto on my iMac, then sync to my iPad. My problem is with movies.

I use two different cameras for movies -- a Sony and a Canon. All works fine with movies taken with a Sony camera, which after downloading to iPhoto, appear as a 'MOV###" file. Those files sync and play everywhere, including on my iPad.

However, movies I shoot with a Canon camera download into iPhoto as a "MVI###" file. Those files play fine in iPhoto on my iMac but will not sync to my iPad.

When I attempt to sync those MVI movies to my iPad I get a warning message saying 'those files did not sync because they can not be played on iPad'

How do I get those MVI movie files to sync to the iPad?

I assume the problem is a formating issue,... but I don't know how to go about the best fix.

Any help would be much appreciated.

Thanks.