How to import the converted files to iMovie?

If you convert video for editing with iMovie, this FAQs is exactly for you. First of all, keep in mind that iMovie only supports these Quicktime-compatible formats: MPEG-4, DV, or .mov.

When the videos are ready, do the following to import files to iMovie: 

1. Start iMovie and click File > Import Movies.
2. In the pop-up Finder window, locate the video file you want to load into iMovie.
3. Select Copy Files, (also on the Import dialog box), if you want to keep files in the original folder. Select Move Files, if you want to move the files to the new destination and remove them from its original folder.
4. Click Import.