AVI and MP4 are containers. Converting between them may involve re-encoding the video and audio, so choose settings that suit the original and the intended player.
Three Steps to Your Output
Add the AVI File
Select Add Media and open your AVI source. Check the displayed dimensions and audio details before choosing output settings.
Select MP4
Choose MP4 with H.264 video and a compatible audio preset such as AAC. Keep the original dimensions unless you have a reason to resize.
Export a New Copy
Choose a destination folder with Save to and select Convert. Open the new MP4 in your intended player before deleting or moving the original.

Choose Quality Deliberately
A higher bitrate usually means a larger file. Re-encoding does not improve detail beyond the original source. Test a short section to balance file size and visible quality.
Earlier Version Reference
Read the Original Tutorial & Screenshots
Archived instructions from the earlier application. The interface, device lists and performance claims refer to that historical version, not the current 8.2.0 build.
Introduction
Some media applications and portable media devices do not support AVI and require conversion, such as iPhone, iPod, iPad, HTC and so on, while MP4 is a video format commonly found on many portable media devices because of its high compression and high quality output. Free CUDA Movie Converter is a video transcoding program that converts any video files into formats that will run on the iPod and other portable devices.
Download the Free CUDA Movie Converter through the link below and save the file to your desktop:
Download Free CUDA Movie Converter
Step 1. Input Video
Launch Free CUDA Movie Converter. Click "Add File(s)..."
to input AVI video files from your computer to the task list.
Use the "Delete" button or "Clear"
button to remove the unwanted files. Click "Move Up"
or "Move Down" button or by dragging the listed
files to queue the added video files to meet your demands. You
can also click "Play" button to play the selected
file with the media player in your system.

Step 2. Preset Output Settings
Click "Select..."
to choose an output folder from your computer to save the output
files. Click "Video" tab
to choose "To MP4"
as an output format you need (there are 3 tabs for output formats:
"Video", "Devices" & "Audio" and each tab contains various
output formats). Then, adjust the output quality with the customized
presets for every format in the "Presets"
dropdown list. Click "Convert"
to start conversion.

Step 3. Start Conversion
After you hit "Convert", some conversion information and a progress bar will be displayed within just few seconds, like the duration, status and progress of the conversion. The post-process options can be chose to play a sound or shutdown the computer when the conversion is finished.

When the conversion is finished, you can have a view of the
general report about the conversion. Click "Open folder"
to directly open the output folder to get the converted video
files.
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