What is MP4?
Short for MPEG-4 Part 14, an MP4 format is a file format for playing music and videos. The MP4 (.mp4) file format was published in 2001 as the revision of the MPEG-4. MP4 is an iPod compatible format, and also iPad, iPhone 3GS, iPhone 4 and iPad. Converting your videos to this format allows you to upload these MP4 files to your Apple Devices or some other MP4 Players and watch them on the go! The MP4 format delivers DVD-quality video in much smaller file sizes. That's why this MP4 format becomes widely accepted by lots of portable players.

How to Convert AVI files to MP4 on Mac OS X, including Snow Leopard?
MP4 format is popular nowadays with various portable MP4 players such as iPod touch, iPod Nano, iPhone 3GS, iPhone 4, iPad, Apple TV, PSP and Creative Zen Vision etc. If you want to watch the AVI videos shared from your friends or download from Network in your portable player, you firstly should convert AVI videos to MP4 in order to be compatible with your MP4 players.

Especially for Mac users, it is helpful since MP4 format is directly based upon Apple’s QuickTime container format.
Mac AVI to MP4 Converter specially designed for Mac users, which supports import various video formats to convert these videos to MP4 on Mac. Apart from converting AVI to MP4 on Mac, this cool Mac Video Converter can also convert other video formats to MP4, such as MKV, AVI, MOV, M4V, WMV, FLV, MTS and M2TS to MP4 on Mac.

Firstly, import AVI Videos and Select MP4 as the Output Format
Select the “File” menu from menu bar, and then choose “Add Video files" to select the AVI files you want to convert to MP4 format. You can also drag the .avi files to the video files list. If you want to join several clips together to a complete MP4 file, just tick the small box of "Merge into One".



Secondly, make a Customized MP4 Video via the Powerful Editing Functions
Mac AVI to MP4 Converter provides four editing functions, as we have seen, to edit videos before converting AVI to MP4 on Mac through the following functions: Trim, Crop, Rotation and Video Adjustments. By clicking the different buttons you can achieve different functions here. In the editing interface with real time preview, we can rotate the AVI files as we need.
Thirdly, start to convert AVI Videos to MP4 on Mac
After you edit the AVI files before converting, the last and simplest step is to click "Start" and start converting your AVI to MP4 on Mac. When the conversion is finished, you can enjoy the AVI videos on your iMac or the MP4 Players.