Step 1: Launch and Input MP4
For this part, you can add your MP4 video through either of the following two ways after you run the application:
a. Click "File" menu to import MP4 video files.
b. Click the "Add video" button which is the first icon on the main menu panel on the interface.

Step 2: Set Output Format as MP3
The Video Converter has a broad format support. For this task, you can go to "Common Audio" to select "MP3" as the output type.

Step 3: Locate the Converted MP3 on Your PC
You can click "Find Target" to find out where you save your MP3 files. You can also set the location by clicking "Tools > Preferences...".
Step 4: Start to Transfer MP4 to MP3
Just hit the "start" tab for transferring MP4 to MP3 audios.
When you are carrying out the steps to convert MP4 to MP3, you will find this software provides a big range of video and audio files for interconversion, including video to 3D, and so on. Now free download this software to get an experience.

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Related Links: How to Add Subtitles to a Video, Convert AVI to MP4 with AVI to MP4 Converter