Clive

Clive is Command-line and fullscreen console program that extracts videos from YouTube, Google Video and other video sites. It supports embedded video extraction, and can be used with an external encoder (e.g. ffmpeg) to re-encode the extracted videos to different video formats (e.g. avi, mpeg, flv).

Features

• Multi-platform; POSIX (BSD/Linux/UNIX-like)

• Supports:

Youtube
GoogleVideo
Dailymotion
Guba
Metacafe
Sevenload
Myvideo

• Bandwidth throttle

• Multi-URL (batch) support

• Compatible with UNIX pipes

• Configuration file support

• Integration with X clipboard (xclip)

• Chain with a 3rd party player software for playing

• Chain with ffmpeg for subsequent re-encoding

• Proxy support; option and http_proxy environment setting

Further more:

• High/low-quality support where applicable (e.g. Youtube)

• URL caching; re-fetch video page only if necessary

• Cache browsing

• Parse and extract videos from RSS/Atom feeds

• Scan and extract embedded videos (Youtube, GoogleVideo)

• Recall last URL batch

• Overridable output filename formatting

• Overridable video page title parsing

• Youtube log-in support with flagged-content override

• Automatic Metacafe family-filter override

• Dailymotion log-in support

• Gzip compressed video page data transfers

• Continue partially downloaded files*

*=excluding Youtube/FLV and GoogleVideo/FLV
Install clive in Ubuntu
sudo aptitude install clive
This will complete the installation.

Clive Example
clive http://in.youtube.com/watch?v=y4LToULvLhE&feature=dir
Usage: clive [options] URLs
For more option check here

Ubuntu Geek