How convert an video file to an audio file the easy way.

I am using Linux to do this but I would think it would work on Windows and Mac as well.
Just change the extension from mp4 to mp3. It works for me.

Please go to this link for an introduction to my videos.
https://youtu.be/1QGlmOknCOU
Also check out this link:
https://youtu.be/ifbtZVJ6pqc

Links to more audio writings:
https://www.facebook.com/Old-A....uthors-and-Writers-2

https://hiawathabible.org/videos-audio-books