How to convert MP4 to MP3 audio files on Mac?

If you want to extract audio files from MP4 videos, iMacsoft Video to Audio Converter for Mac can help you convert MP4 to MP3 audio files with original sound quality. Free download this MP4 to MP3 Converter for Mac, and easily get the OST (original sound track) from your favorite movies, then you can enjoy the background music and dialogues with your MP3 players on the go. It is also useful for lecture recordings, TV episodes, and so on. See the instructions as below:
1: Load MP4 video
Directly click "Add" button or choose "Add..." option in the top "File" menu, you will see an "Open" dialog window pops up, and select MP4 video files from your Mac HD. When it is done, press "Open" button to load MP4 video files.

2: Select MP3 format
In the left "General" panel, you will see the "Profile" option, click it and select "MP3 - MPEG Layer-3 Audio (*.mp3)" item for output MP3 audio files. The software allows you to set different output formats according to different files.

3: Adjust some parameters
1)After selecting certain output format, you can choose "General" tab on the right top which will show its general standard. You may set "Video Quality", "Audio Quality", "Output filename" by clicking "General" button.
2)After that, you can also choose "Advance" tab on the right column which will show its advanced standard. You may set "Start Time", "Video Size", "Bit Rate" by clicking certain settings.

4: Output MP3 audio files
Clicking the "Browse..." button and select the output destination for saving in the pop-up window and then select and check MP4 videos in the file list you want to convert and press "Convert" button to start MP4 to MP3 audio files converting process. And you will see the convert process exactly in the progress "Status" bar.

Tips: How to trim video segment?
Select one video in the file list, click "Trim" button in the toolbar to open "Trim" window. You can clip the original video into several parts, then convert and output them separately or as a whole one. Set start point and end point, you get the segment you want to convert and output.