IMovie Won't Import MP4 Files

For some reason iMovie '11 won't let me import videos. Specifically, I'm trying to add MP4 files that I copied to my hard drive from my GoPro HD 960. For GoPro users, I used the R2 (720p) format. They open properly in QuickTime and VLC but can't be imported into iMovie (or iPhoto). When I select File-->Import-->Movies and browse to the directory where I saved all the .mp4 files on my hard drive, they're all greyed out. And actually, it seems that just about no video files at all on my computer can be added (all greyed out)--even other MP4 files.
I downloaded MPEG Streamclip but that says "unrecognized file format" when I try opening the videos. I also installed Perian and rebooted.
In case it helps:
- I have an Intel MacBook running OS X 10.6.8 with iLife '11
- QuickTime info for the video format says "H.264, 1280 x 720, Millions; AAC, 2 channels, 48000 Hz"
- VLC says "Stream 0 (Video) - Codec: avc1" and "Stream 1 (Audio) - Codec: mp4a"
Any ideas? This is incredibly frustrating!

Why iMovie Won't Import MP4 Files?
Technically, iMovie does import MP4 video. However, iMovie only import MP4 files that are encoded with MPEG4/AAC or H.264/AAC data. And yet, MP4 is a video container format that may contain various audio and video codec (and sometimes even subtitle streams included). If the MP4 file is not encoded with iMovie support codec, iMovie will refuse to import this kind of MP4 video.
How to Solve Can't Import MP4 into iMovie?
In order to successfully import all kinds of MP4 files to iMovie, a recommended solution is to convert iMovie unrecognized MP4 to iMovie supported video format.
iDealshare VideoGo is just the right MP4 to iMovie Converter which can convert various MP4 to iMovie supported MPEG-4, MPEG-2, MOV or DV. Besides converting MP4 to iMovie, iDealshare VideoGo also helps to convert other video formats including AVI, WMV, MPEG, VOB, MOV, AVCHD, MTS, M2T, M2TS, TOD, MOD, XAVC, FLV, MKV, SWF, 3GP, MVI, ASF and etc to iMovie video format.

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1920 x 1080
AVC Coding, 1920 × 1080, Millions
AAC, Stereo (L R), 48.000 kHz
Is the info for the first file
1920x1080
AVC Coding, 1920 × 1080, Millions
AAC, Stereo (L R), 48.000 kHz
Info for the 2nd file.
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