ketanketanketan

$ youtube-dl -xv --audio-format "mp3" https://www.youtube.com/watch?v=qzGk9C8KI0w

[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-xv', u'--audio-format', u'mp3', u'https://www.youtube.com/watch?v=qzGk9C8KI0w']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.10.24
[debug] Python version 2.7.10 - Darwin-15.0.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.8.1, ffprobe 2.8.1
[debug] Proxy map: {}