Apple Resources - ffmpeg (media file converter)
http://edu-observatory.org/olli/Manage/ffmpeg.html

   ffmpeg is a universal media converter. It can read a wide
   variety of inputs - including live grabbing/recording
   devices - filter, and transcode them into a plethora of
   output formats.

1. Download and Install Homebrew from the Mac Terminal
   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  
2. Install ffmpeg (using Homebrew) from the Mac Terminal 
   /opt/homebrew/bin/brew install ffmpeg 
  
3. Using ffmpeg  
   Man page for ffmpeg
   man ffmpeg
   Quick help
   /opt/homebrew/bin/ffmpeg -h
   Examples
   /opt/homebrew/bin/ffmpeg -i  input.webm output.mp4
   /opt/homebrew/bin/ffmpeg -i 'input.webm' -q:a 0 -map a output.mp3


  
  

 
    sam.wormley@icloud.com