Video Editor for Mac can edit avi, mp4, mov, mpg, mpeg, flv, mkv, tod, mod on Mac OS X.
Video Editor for Mac offers you a one-stop service to edit video, audio, photo, effect and special effects. You are also allow to crop movie and trim movie freely. Using Mac Video Editor you can easily export flv, wmv, mkv to mp4, m4v, mov, avi, 3gp which are supported by iMovie, then it will be an easier thing for imovie to import them and export later on for playback onto iTunes, QuickTime.
Screenshot of Video Editor for Mac