Hello All,
I chanced upon another way to extract Audio (.mp3) from video files (.mp4)
Using the freeware program,
Audacity, open the .mp4 file.
Audacity won't show the video but it will display the audio track.
In Audacity, select
File/Export/to Computer and navigate to where you wish to save the .mp3 file.
Audacity is available for Windows, MAC and Linux. Download this free program at
https://www.audacityteam.org/download/Ralph Sutter