Hey,if it is too large,you can convert it to .mp4.Or you can try this method:
1.Drag & drop AVI files to iMovie.
2.Select "iMovie" from output format list, the preset is the optimized settings for iMovie.
3.Hit the Convert button and this AVI to iMovie Video Converter for Mac will convert your AVI rapidly and the output file is ready for being imported to iMovie.
4.Launch iMovie, from the File menu, choose Import > movies, navigate to the folder that output AVI videos are saved. Select the files and click "Import".
Bingo! You did it!
1.Drag & drop AVI files to iMovie.
2.Select "iMovie" from output format list, the preset is the optimized settings for iMovie.
3.Hit the Convert button and this AVI to iMovie Video Converter for Mac will convert your AVI rapidly and the output file is ready for being imported to iMovie.
4.Launch iMovie, from the File menu, choose Import > movies, navigate to the folder that output AVI videos are saved. Select the files and click "Import".
Bingo! You did it!