GoPro Hero 3 Black .mp4 footage import--current best way?
I've read a lot in these forums about importing .mp4 footage into FCPX. It seems that it used to be the case (and maybe still is?) that FCPX either wouldn't import .mp4 files, or wouldn't do a good or reliable job if it did.
I've been shooting some footage with a GoPro Hero 3 Black. FCPX seems to import it just fine. But I'm not sure if that's the best way to do it? Should I be using another program (like GoPro's Cineform software) to first convert the Hero 3 .mp4 files to .mov files? Or should I just let FCPX do it?
Also, I noticed something that seems odd when I'm importing these .mp4 files: If I import them directly from the SD card that the GoPro stores them on, I can select in and out points in the .mp4 clips I'm importing. But if I first copy the .mp4 files from the SD card to one of my hard drives, I cannot select in and out points when importing (I have to import the entire clip). Why is this?
(I should mention, in case it is relevant, that the clips I cannot select in and out points for [the ones that I first copied to my hard drive] are 1080p 60 fps, and the ones that I can select in and out points for [the ones I'm importing directly from the card] are 720p 120 fps.)
iMac (27-inch Mid 2010), OS X Mountain Lion (10.8.3), Two internal drives (one SSB)