ClipGrab is a free downloader and converter for YouTube, Vimeo, Metacafe, Dailymotion and many other online video sites. It converts downloaded videos to MPEG4, MP3 or other formats in just one easy step.
It supports HTTP and Socks5 proxy.
Download and run ClipGrab
wget http://download.clipgrab.de/clipgrab-3.4.2.tar.gz
Extract ClipGrab:
tar xvf clipgrab-3.4.2.tar.gz
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Cd into extracted directory:
cd clipgrab-3.4.2
Make executable (both 32 and 64 bit):
chmod +x clipgrab-*
Run:
./clipgrab-3.4.2.x86_64
See also: How to download Youtube video on linux using youtube-dl, Movgrab and ClipGrab