Download ONLY audio from a youtube video

Question

I know that there are a million ways to download a video from youtube and then convert it to audio or do further processing on it. But recently I was surprised to see an app

Answer 1

FFmpeg is capable of accepting an URL as input. If the URL is seekable, then FFmpeg could theoretically skip all the video frames, and thus it would need to download only the data for the audio stream.

Try using

ffmpeg -i http://myvideo.avi out.mp3

and see if it takes less bandwidth.