Introduction
If you have some MP4 video files and want to extract the audio from those files, you can convert your MP4 files to MP3 audio files. To convert MP4 to MP3, you will need to use a video to audio converter program. There are plenty of products to choose from, however, Free MP4 to AVI Converter is the right choice. It is a free and safe video to audio conversion program that can batch convert almost all popular formats.
Download the Free MP4 to AVI Converter through the link below and save the file to your desktop:
Download Free MP4 to AVI Converter
Step 1. Input Video
Launch Free MP4 to AVI Converter. Click “Add Video…” 
to input MP4 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 “Audio” tab 
to choose “To MP3” 
as an output format (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.
