youtube-dl

download videos from youtube
youtube-dl is a small command-line program to download videos from
YouTube.com and other sites that don't provide direct links to the
videos served.
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youtube-dl allows the user, among other things, to choose a specific
video quality to download (if available) or let the program
automatically determine the best quality video to grab. It supports
downloading entire playlists and all videos from a given user.
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Currently supported sites are video.google.com, Youtube, Photobucket,
Dailymotion, Metacafe, Facebook, Yahoo!, and depositfiles.com.