Notes on Youtube.dl tool

youtube-dl

1. Install
   sudo apt-get install youtube-dl
   sudo apt-get install libavcodec-extra-53
2. Download video
   -Single video
    youtube-dl -f 18 <URL>
   -Batch
    youtube-dl -a filename.txt
3. Check all supported video formats for a youtube video
   youtube-dl -F <URL>
4. Extract audio from youtube video url
   youtube-dl <URL> --audio-format mp3
5. Download all songs in a playlist:
   youtube-dl -citk --max-quality FORMAT http://www.youtube.com/playlist?list=xxxxxx

You can use Linux based Soundconverter software (http://soundconverter.org/) to convert downloaded videos to mp3


Online reference:
http://www.linuxb.in/2012/01/how-to-download-youtube-videos-in-linux.html