Extract the audio stream from YouTube videos

If you want to extract the audio stream from a video, you can do that with a series of software free and not free, but I prefer to use ffmpeg at the command line. It is very quick and simple.

Beware some video's have multiple audio files. Using the correct demuxing procedure is in order.

In this article I assume you want to extract audio from YouTube Video's with one audio stream

• Open a terminal screen. (Ctrl+T in Ubuntu) 

• type: ffmpeg -i inputfile.mp4 -vn -ab 256 outputfile.mp3

for more information visit the FFmpeg site