You can use iMovie Video Converter to convert AVI to videos supported by iMovie such as MP4.
Step 1: Install and Run iMovie Video Converter for Mac
You can download the trial version here: http://www.mp4kits.com/Guides/iMovie/import-avi-to-imovie/
To install it, simply mount the .dmg archive by double-clicking it, and copy the application to your applications folder (or wherever you want it).
Step 2: Add AVI Video
Click “Load video" button to add video files for converting. After one or several video files like AVI, WMV, 3GP, etc are imported successfully, you can see all of them listed in the program.

Step 3: Output Settings
Choose a format like MP4 which is compatible with iMovie from the profile drop-down menu.

Step 4: Start convert AVI to iMovie MP4
Press "Convert" button, it begins to convert your AVI files to iMovie MP4 format.

After the conversion, you can right-click in the Event Library area and choose Import Movies to import the created .MP4 file to your iMovie project. Specify a new Event name if desired. The imported video will now be available for you to edit.
avi to iMovie converter can also import flv to iMovie, import 3gp to iMovie, import asf to iMovie, import 3g2 to iMovie, import mkv to iMovie, import mod to iMovie, import tod to iMovie, import mts to iMovie, import m2ts to iMovie, import tp to iMovie, import trp to iMovie, import ts to iMovie, import m4v to iMovie, import wmv to iMovie
When you download some interesting videos from YouTube you might thinking of sharing with friends on your iPhone, iPod touch or iPod nano anywhere at any time or play the flv videos on your quicktime player. But as we all know, quicktime don't support flv format. Thus, you need a flv converter to quicktime to help you convert flv to quicktime. The best way to find a good flv to quicktime converter for mac is to free try using it first.
Aimersoft flv to quicktime converter Mac, also called flv converter to quicktime, can help Mac users fulfill a perfect task on converting flv to quicktime mac. Apart from converting flv to quicktime, aimersoft flv to mp4 converter also allows Mac users trim the video length or crop the video size. The latest version supports snow leopard. Free download it and free use it to converting flv to quicktime video files now!
After downloaded this flv converter to quicktime file successfully, double click it and launch aimersoft flv to quicktime converter for Mac.
Step 1: Import your flv file
Run the flv converter to quicktime and drag all FLV(.FLV) video files to the program.Get ready for converting flv to quicktime mac.

Step 2. Choose the output format "MOV" (Quicktime supports MOV format)
Click the format icon "ipod", and it will pop up an box as below.

Click the format,it will appear the output box, choose the "MOV".

Step 3. transcode the vides from flv to quicktime
Click "Start" when everything is set, and the flv converter to quicktime conversion will be completed automatically. Converted files can be found by clicking "Find Target".
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