Using QuickTime Player for iMovie video to MP4 conversion
As for Mac users, they can export iMovie videos to MP4 with QuickTime Player.
Step 1: Open the file you want to convert in QuickTime by clicking “Open File…” under the drop-down box of “File”.
Step 2: After the iMovie file is imported into QuickTime Player, you can choose “Export” under “File” menu.
Step 3: Then, choose “Movie to MPEG-4” in the drop-down menu of “Export” panel to export iMovie video to MP4.
Step 4: At last, press “Save” button and your iMovie video is exported to MP4 smoothly.