title: Extract audio to mp3 from mp4 using C++ (not executing ffmpeg with args)
body: <p>How can I programmatically convert (extract the audio channel) from the mp4 video file format?<br>
  I just can't find anything on the web, for using C++.  </p>
  
  <p>Passing command line args to LAME or MPLAYER or FFMPEG is not an option.</p>