title: Extracting mp3 audio file from youtube video in C#
body: <p>I am building a program(in C#) and I need to download the audio from a youtube video(using the URL). I found two libraries which allow me to do it:
  YotubeExtractor and libvideo(Also known as VideoLibrary), but I don't know how to use them, I mean I tried using their documentation but non of them worked.
  Do you know another way which I can download or maybe explain me how to do this?
  Thank you and have a nice day!</p>