AVI Cutter for Mac is a great helper which can help you cut and trim videos on at will. What you need is just set the start time and end time of the video, then your favourite avi files will be stored in the folder you have previously selected.
Guide: how to cut AVI videos on mac.
Step 1: Free download AVI Cutter for Mac, install it and the screen will be popped out like this.

Step 2: Load AVI files you want to cut on mac.

Step 3: Click "Trim" button, you will be popped out the screen like this:

Step 4: Drag the arrow to set start time and end time.

Step 5: Click "Ok" button to start trim videos on mac.
AVI Cutter for Mac provides you only fast speed and excellent quality, try AVI Cutter for Mac right now.