how to download video flv video directly from youtube [closed]

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I'm trying to download flv video directly from youtube using

http://www.youtube.com/get_video?video_id=9Mu23wVb--4=TOKEN

Note:In place of TOKEN i placed the value of obtained from below url....

youtube.com/get_video_info?&video_id=9Mu23wVb--4

After trying this option, i'm getting page not found. is there any way to get the flv video location from youtube using some tweak's

Note: i know this is against youtube policy but i just wanted to understand how some tools/softwares were able to download youtube video directly

Regards, Sukumar

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Get Firebug and inspect requests/responces when playing video. If you can recreate request(s) with right headers/parameters, you'll get what you want.

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http://keepvid.com/ dun try to download youtube video with this site.