AVI to iMovie, import or edit AVI into iMovie'11

Do you encounter problems in loading .avi files into iMovie? Like can't the iMovie screen shows nothing or image only with any sound, when it completely loaded, even "grey out" in the import window. In fact, the iMovie'11 can only support MP4, M4V, MOV files and some types of AVI files. Supposed that your handy .avi can't be recognized by iMovie, it's because of the AVI codec used to .avi file isn't compatible with iMovie. You may know that AVI file can be associated with three coedcs like AVI, XviD and DivX. 
In order to edit AVI videos in iMovie, you can try converting AVI to iMovie acceptable file format on Mac, then you can get the generated file to be imported into iMovie for further editing in iMovie. 
Tip on iMovie supported video file formats:DV, DV Widescreen, HDV 1080i (25 and 30 fps), HDV 720p (25 and 30 fps), MPEG 4 Simple Profile, iSight. 
Doremisoft AVI to iMovie Converter is such the program that allows you to convert AVI files to MOV or DV for iMovie . As it has presets for iMovie, so the output video quality can be optimized. More than that, it can do other video like MP4, MKV, MOV, etc to a specific programs like iMovie, FCP, etc. Also, you can extract audio from the source video with it.
The easy guide on how to edit AVI in iMovie:
Preparation:Download the AVI to iMovie Converter on your Mac (Mac Mountain, Lion OSX included)iMovie ( iMovie HD, iMovie 07, iMovie 08, iMovie 09, iMovie 11) installed
Then, start the steps for AVI to iMovie conversion:
1. Import AVI to the applicationClick "Add File" to load AVI files from your Mac into the software. 
2. Select iMovie as output formatYou can select "iMovie" under the menu of "Profile". Also, you can specify a destination folder for saving output files. Additionally, if you would like to edit the AVI in Final Cut Pro, you can directly select "FCP" as output. 
3.Convert AVI to iMovie Click on the green Start button on the lower part of the application window to start the conversion of AVI to iMovie. The "Open output folder when conversion finished" option is ticked by default, so you can get to the converted files right after the conversion. If you are converting a lot of files at a time and you don’t want to wait around your computer, you can just tick the "Shut down computer after conversion" option.
More tips about file types compatible with iMovie:iMovie '09 and iMovie '11 work with most Mini DV tape-based camcorders and tapeless camcorders. Most of high definition camera/camcorder videos (AVCHD/MTS/M2TS, MOD/MPG/MPEG/MOI, TOD/M2T, TR, TRP, TS) can be imported into iMovie '09/'11, but the formats are still very limited as following:Tapeless Camcorder (MPEG-2, MPEG-4 and AVCHD);
Tape based DV-Standard and HDV (High Definition Video);Part Camera/Mobile Phone video/other video recorder devices (MPEG-1, MEPG-2, MPEG-4, H.264, 3GP, MP4);Part of QuickTime compatible MOV videos;MPEG-4 video.