iMovie is a video editing software application which allows Mac users to edit their own home movies. It was originally released by Apple in 1999 as a Mac OS 8 application bundled with the first FireWire-enabled Macintosh model. Since version 3, iMovie has been a Mac OS X only application bundled in the iLife suite of Macintosh applications. 

Flip video camcorders can capture video in both standard definition in 640*480 resolution at 30 frames per second, using the MPEG-4 ASP video compression and high definition at 1280*720 resolution using H.264 video compression, AAC audio compression and the MP4 file format.

What will happen when iMovie when iMovie comes across Flip video camcorder? Do you still feel frustrated with the failure in importing Flip video to iMovie? The article will give you some tips on how to solve the problem. 

Solution 1: More than one time I noticed people talking about a free application called iSquint which can convert Flip videos to iMovie compatible MPEG-4 or MOV format, however it will result in quality loss during conversion.

Alternatively, try another safer and fastest way to do this is to use the professional Flip video Converter for Mac, it is 100% clean and powerful which can convert flip video formats to iMovie supported MPEG-4 (MP4, M4V), MPEG-2, DV, HDV and MOV without any difficulty.

Step by step guide on how to edit Flip camcorder video in iMovie:

Step one: Install Flip Video Converter

First, download Mac Flip Video Converter to your Mac, then install it according to the installation guide. 

Step two: Import Flip Video files

Click "Add File" button to import the Flip Video files to the software, you can play the loaded videos for preview. 

Step three: Export Flip Video to iMovie

From Profile list, select iMovie Video group, then choose your wanted video type. You can adjust the video quality by click "Settings" button.

Step four: Convert Flip Video to iMovie

Find a destination to store the new created movies, then hit "Start" button, you'll get the final video files compatible with iMovie for a short time.

Resource from http://luckstar.blogmas.com/how-do-i-import-video-from-flip-camcorder-to-imovie-for-editing/