My apologies for digging up an older thread, but I have noticed one thing when shooting video with my 5D Mark III and then editing on a Mac/FCP.
At work, all of my video editing is done on a Mac and FCP 7. Normally, I use a Sony HXR-NX5U, which FCP logs and transfers just fine. I'm aware that DSLR footage isn't native to FCP7 and as such, must be transcoded to ProRes for efficient editing. If I can't transcode directly via FCP, I use MPEG Streamclip.
With that said, I recently shot some footage on my 5D3 @ 1080p/24fps/ALL-I. I loaded the footage into MPEG Streamclip (latest build)....and the program promptly crashed. I tried again and got to the export screen, but it crashed again. I then loaded up FCP7 and entered the Log/Transfer menu, to transcode the ALL-I footage to ProRes. Same thing happened-- FCP crashed when trying to bring up the ALL-I footage.
So I went out and reshot the clips, this time in IPB. I brought the 5D3 IPB footage back to my Mac, loaded up MPEG Streamclip and voila: Footage was converted to ProRes MOV files without issue or crashing.
Now, I may be completely oblivious to some work around, or I may be having a "Master of the Obvious" moment, but for FCP/Mac users, I would advise shooting IPB to avoid transcoding headaches.
Of course, if you use Adobe Premiere 5.0/higher (as I do at home on my PC), then all this is bypassed, due to Premiere's native DSLR capabilities .
LOL you don't need to transcode ALL-I, the whole point of shooting ALL-I is that it's more edit-friendly, you should be able to just drop it in and edit. And seriously get off of FCP7, FCPX is 10x better now that it's had a few years of updates. And plus you can edit H.264 whether it be IPB or Prores straight off of the card and skip transcoding all together. Plus it's 64-bit (So you can use much more RAM than the 2.5GB max FCP7 has) and you dont have to waste countless hours waiting on stuff to render. Seriously, people were turned off by it at first, but only because it looked a lot like iMovie, but it's seriously an awesome NLE now. I don't care if you're the best FCP7 user on Earth, no way you could finish the same project in FCP7 faster than I could in FCPX.