Summary: Facing issues when importing and editing MP4 files in iMovie '11/08/09? If so, follow the quick-start guide to learn how to prepare MP4 videos for editing in iMovie without quality loss.
According Apple official website, iMovie (including iMovie '11/'09/'08) can only import DV, MPEG-4, MPEG-2, MOV and M4V. Though the MP4 file format defines the storage of MPEG-4 audio, scenes and multimedia content using the ISO Base Media File Format, the MP4 file may also contain any number of audio, video, and even subtitle streams. So it is impossible for the MP4 file to determine the type of streams in an MPEG-4 file based on its filename extension alone. Therefore, you may have some clues that why people using Mac (even Mountain Lion) always meet difficulty in importing mp4 into iMovie.
Q: “Trying to input a mp4 file to iMovie but for some reason it won't drag and drop... Do I Need to upgrade to a newer version of iMovie or what?”
Do you also have such hassles when playing or editing the MTS files? If so, hopefully the instructions below can help you out of troubles. Since iMovie can’t supported some H.264 MP4 or some other camera videos like from GoPro, in order to edit MP4 video files in iMovie, you need to convert .mp4 to iMovie supported video formats first. To finish the task, you can use Brorsoft Video Converter Mac, the best video converter that can help Mac users transcode MP4 to iMovie AIC .mov with high output video quality. Download it now and follow the steps to convert your MP4 videos to iMovie for editing.
How to import MP4 video into iMovie 8/9/11?
1. Import MP4 files
Run the MP4 to iMovie Coverer; click the Add button to load .mp4 files to the program from your computer or camcorder. You can also directly drag the video files into the program directly.
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.
Tip: If you like, adjust video and audio parameters, including the Bitrate of Video and Audio, the Codec of Video and Audio, Video Size, Sample Rate, Frame Rate, Audio Channels, etc., by clicking the Settings button on the main interface for getting the best quality.
3. Start to convert MP4 video clips to iMovie
Simply click the Convert button to start converting MP4 video to iMovie friendly video formats. Within several minutes, you can find the converted file on your computer by clicking the “Open” button. And then you can import the converted files to iMovie for editing via its “Import” option.
The smart MP4 to iMovie Converter is not only designed for converting MP4 to iMovie. It is also professional in making AV files editable in iMovie, M2TS to iMovie, Canon/Nikon MOV to iMovie, GoPro HD to iMovie, Sony XAVC to iMovie, etc to meet your different needs.
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Source:What if iMovie won't import MP4 files