iMovie only supports importing MP4 formats with MPEG4/AAC or H.264/AAC data, not all kinds of MP4 formats. Some MP4 files from like Sony, Hybrid camcorders and other devices cannot be accepted by iMovie.
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.
To smoothly import MP4 to iMovie, you'd better to convert these MP4 files to iMovie totally compatible MP4 or MOV (QuickTime) formats.
Slove MP4 to iMovie issue(iMovie'11 Included)
Here, I highly recommend Pavtube Video Converter for Mac -- MP4 to iMovie Converter for Mac to successfully convert MP4 to iMovie supported MP4 or MOV (QuickTime) formats.
Hot Search: AVCHD MP4 to iMovie | 4K Video to iMovie/FCE/FCP | Exporting iMovie projects in different ways
Pavtube MP4 to iMovie Converter for Mac has the following features:
- Works on 10.11(El Capitan), 10.10(Yosemite), 10.9(Mavericks), 10.8(Mountain Lion), 10.7(Lion), 10.6(Snow Leopard), or Mac OS X v10.5(Leopard);
- Except Converting MP4 to iMovie, Faasoft MP4 to iMovie Converter for Mac also supports nearly all kinds of video formats like MOV, AVI, WMV, MPEG, FLV, MKV, OGV, 3GP, MXF, WebM, AVCHD, MTS, M2T, M2TS, TOD, SWF, MVI, ASF, MOD, XAVC to iMovie;
- Acts as an inbuilt editor: trim, crop, merge files into one, split by chapter, rotate, adjust sound volume, add or remove subtitles, add effect/watermark to video files, adjust video/audio bitrate, codec, channels, frame rate, sample rate, resolution, aspect ratio and etc.
Step by Step Guide to Convert MP4 to iMovie
Step 1 Add MP4 to Pavtube MP4 to iMovie Converter for Mac
Launch the program on your Mac, add MP4 files to the program by clicking the "Add Video" or "Add folder" button, or just simply drag and drop MP4 that you want to convert to the main interface of program.
Step 2 Set output format
From "Format" drop-down option, choose the output format according to your own preference, for iMovie editing, select "iMovie and Final Cut Ex..." > "Apple Intermediate Codec (AIC)(*.mov) to output.
Step 3 Convert MP4 to iMovie
Click the big "Convert" button of to start MP4 to iMovie conversion.
When the conversion finished, click "Open Folder" to get the converted files. Then start your iMovie, and choose "File" > "Import" > "Movies". You can freely drag the converted MP4 files to iMovie.