Why we still encountered the issue of failing to import MP4 files from GoPro Hero 2/3/4 to iMovie? The following pages will clearly describe the reasons, and teach
you how to convert GoPro MP4 video to iMovie AIC MOV format (iMovie'11 Included)?
Why Sometimes Can't Import GoPoro H.264 MP4 video to iMovie?
Reason One: iMovie only supports importing MP4 formats with MPEG4/AAC or H.264/AAC data, not all kinds of MP4 formats. MP4 files from GoPro Hero 2/3/4 are in H.264 codec will not be accepted by iMovie.
Reason Two: iMovie contains all the essential codecs to read MP4 files. Any different codecs included in audio and subtitle will cause the issue. In the circumstances, we still cannot successfully import MP4 files to iMovie.
So, How to importing GoPro HD Hero 2/3/4 video to iMovie on Mac (Mavericks included) ?
To smoothly import MP4 from GoPro cameras to iMovie, you'd better to convert these MP4 files to iMovie totally compatible MP4 or MOV (QuickTime) formats.
To fulfill your task, you can just get Brorsoft Video Converter for Mac, a powerful GoPro video converter, editor and player. It offers an optimized preset Apple Intermediate Codec .mov for iMovie for easy access. Besides transcoding MP4 video to iMovie supported videos with optimized settings while keeping the video quality, the toolkit can encode GoPro HD videos to FCP, FCE, Avid Media Composer, Adobe Premiere Pro, etc natively supported video formats on Mac OS X (Mavericks and Mountain Lion included) with fast speed. See how below about converting GoPro MP4 to iMovie format.
Convert GoPro HD Hero 2/3/4 MP4 to iMovie editable format
Step 1. Load GoPro videos
Drag & drop MP4 footage from GoPro to the program directly. Or go to the "File" menu, choose "Add Video Audio" to locate the MP4 files you want to add. You can add several files to do batch conversion.
Step 2. Select the output format
You can choose iMovie/FCE -- > Apple InterMediate Codec(AIC) (*.mov) as the output format. The output video can be imported to iMovie 11/iMovie 09/iMovie 08 directly.
Step 3. Start the conversion
Click “Convert” button to start converting Gopro HD MP4 video to AIC .mov for iMovie.
Some more helpful features of the GoPro Video Converter:
1. Settings- Click it to customize audio and video parameters Video Codec, bit rate, frame rate, Audio codec, sample rate, audio channels. Notice that you can not “convert up” video quality. If you use GoPro Hero 3, Hero record 4K files, you’d better change the resolution to 1080p, as iMovie is not able to import and edit 4K videos.
2. Editor (next to "Add" icon)- Click to set add watermark, deinterlace, trim, crop, add subtitles, etc.
After the conversion, click “Open” button to get the exported files and then import the converted GoPro MP4 files to iMovie for editing with ease.
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Source:Tricks for Editing MP4 files in iMovie