Here is a (very nice to me!) surprise, a feature that appeared in iMovie'11 and does not seem to be documented by Apple.
I have 2 cameras that shoos at 60 frames per second (a Xacti HD2000, able to shoot 1080p60, and now also a GoPro Hero HD, able to shoot 1080p30 or 720p60)
Up to iMovie'09, I had to mess with the project files in order to be able to output 60fps movies.It worked, but was painful
Now having a quite powerful Mac, I always shoot at 720p60 or 1080p60, but never tried to output at 60p in iMovie'11.
I just tried and ... ity workds : beautiful 720p60 output!
(this is really 60p: opening the movie in Quicktime Player, pressing the right arrow always changes the image, and the time counter requires 60 right arrow presses in order to add 1 second).
So, here is what you have to do if you want to export a 60p movie made with your 60p footage :
- create a NTSC (29.97 fps) project in iMovie
- choose "export using quicktime" in the "Sharing" menu
- choose the correct codec settings (I choose a Quicktime movie with the H264 and AAC codecs, max quality, and recompress the movies with Handbrake afterwards)
- be sure to check the correct framerate (59.94 fps for my 2 cameras, I guess it should be pretty standard - you can always check it in the information window in Quicktime Player for a raw file from your camera)
- export and enjoy.
My wakeboard movies (which have a lot of detail and fast motion) look phenomenal in 720p60 and way better than in 720p30 on my big TV!!!
I hope this helps all tho edit sports movies in iMovie!