#1997 - Update movie dimensions and mime type if previously set without FFmpeg.
- Added code to check/correct movie width, height, and mime in graphics::generate.
As the comment says in the commit, this isn't ideal, but doing it in an upgrade
script wouldn't be very ideal either.
Merge pull request #130 from shadlaws/fix_1997

#1997 - Correct movie dimensions and mime type improperly set by contributed modules.