Download the MAC AVI Converter and install it to your mac. you will see an interface as the above!
Add avi files to the AVI Converter for MAC, and click the "Play" button to see the preview.
Choose the output format of the AVI Video and click Browse button to set output folder.

Click the "Convert" button to start the converting process of MAC AVI Converter!

Easy, isn't it ? Why not choose the AVI Converter for MAC.