If you have an MP4 video that you'd like to use in iMovie, you should have no problem importing the footage and making the changes that you would like to make, including adding music, transitions and title pages. When you've finished editing, you can then convert the file -- which started out as an MP4 -- to a number of different file formats using the QuickTime conversion provided as part of iMovie.
Open iMovie. Create a new project by selecting "File," then "New Project." Follow the prompts to give the new project a name, and select the folder your files will be saved to.
Import your video by selecting "File," then "Import," and then "Movies." Click the video you want imported, then click "Import." This will import your video into the Events pane of iMovie.
Click on the imported video to highlight it in the Events pane, then drag it to the Timeline in the bottom section of iMovie.
Make any edits you want to make to the video by clicking on the effects icons under the Video Viewer and dragging the desired music or effects into the selected portion of the video in the Timeline.
Select "Share" from the top menu of iMovie, then select "Export using QuickTime." From the popup menu that appears, click the "Export" tab to select the format you would like QuickTime to save the file as. Choices include .AVI, QuickTime movies, and iPhone movies, among others. Give the file the name you desire, making sure to leave the file extension (such as ".MOV") on the end of the file name. Choose the folder you would like the file to save to, and click "Save." Your file will now be converted to the file format you've chosen. The process could take several minutes, depending on the length and quality of your video.
Tips & Warnings
- If you have a file that didn't start out as an MP4 but you want it to be one, follow the same steps to import and convert it, choosing "Movie to MPEG-4" from the list of file formats mentioned in Step 5.
- Photo Credit Jupiterimages/BananaStock/Getty Images
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