MP4 to MP3-This guide is about converting MP4 video files to MP3 and extract mp3 from mp4 files.

1. How to Convert MP4 to MP3 in Mac and Windows?
MP4 to MP3 Converter Mac can help convert MP4 to MP3 and
extract MP3 audio from MP4 Video files on Mac os x (Mountain
Lion, Lion included).
How to Convert MP4 to MP3
Download and install the MP4 to MP3 Video converter or MP4 to
MP3 Converter for Mac which would help you a lot during the
conversion:
Step 1: Add MP4 files to the MP4 to MP3 converter
Run the MP4 to MP3 converter on PC, click "Add video" and add
the MP4 files you want to convert to MP3.

2. Step 2: Set the output profile
Click the format icon and select MP3 as the output format. You set
the codec on the Advance menu. Click Tools>Preferences and set
the output directory.
Step 3: Start the MP4 to MP3 conversion
Click "Start", and the MP4 to MP3 converter will extract your
favorite music from the MP4 files for you automatically.
Click "Open Folder" when the conversion is done, and then you can
enjoy your music!
TKS