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CClive is a command line application that downloads videos from a number of sites including youtube and dailymotion. If you run:

cclive url1 url2 url3 ...

cclive will download the videos to the current working directory.

See man cclive for details of more advanced options.

Abby is a GUI frontend for cclive. It seems from the google code page that the development is inactive and I can't get it to work in Maverick. I remember using it in Lucid and it worked OK.

I recall having problems with cclive and abby when I was using it on Lucid for downloading youtube videos. This is because youtube changed their implementation (probably to stop downloaders like cclive) and the version of cclive in the repositories wasn't up to date enough to work. There were similar problems with youtube-dl. A solution to this is to install a newer version from source or find a ppa of the newer version.

The commandline tool youtube-dl can download videos from YouTube, dailymotion and some other sites.

sudo apt-get install youtube-dl

There is also a Totem plugin to look at Youtube videos.

One of the better tools is the Firefox Add-On 1-Click YouTube Video Download. It gives you an easy right-clickable download link.

By far the best way to download flash videos from the internet is using the get_flash_videos tool from here http://code.google.com/p/get-flash-videos/ . From the description on the page:

Download videos from various Flash-based video hosting sites, without
having to use the Flash player. Handy for saving videos for watching
offline, and means you don't have to keep upgrading Flash for sites
that insist on a newer version of the player.

Includes support for the following sites/players (and more!):

YouTube, eHow, Brightcove (used by many sites like Channel 4, Daily
Telegraph ...), BBC (news, etc), Metacafe, 5min, Google, fliqz,
nicovideo, vimeo, Blip, Break, Collegehumor, Muzu, Sevenload,
Megavideo, Wat.tv. Also includes a 'generic' method which works on
many other sites.

I would definitely recommend using this program.

CLI alternatives for downloading from YouTube or other flash video streaming sites:

Syntax:

get_flash_videos [OPTION]... URL...

with specified URL of the video.

get_flash_videos [OPTION]... SEARCH

where SEARCH is the video-name/string to search for in Google Videos.

Supported sites:

Supports many video sites including

• YouTube,


• eHow,


• Brightcove (used by many sites like Channel 4, Daily Telegraph ...),


• BBC (news, etc),


• Metacafe,


• aol,


• Google,


• fliqz,


• nicovideo,


• vimeo,


• Blip,


• Break,


• Collegehumor,


• Sevenload,


• Wat.tv

Syntax:

youtube-dl [options] url ...

Some of currently supported sites:

• CollegeHumor,


• Comedy Central,


• Dailymotion,


• Facebook,


• Metacafe,


• Photobucket,


• The Escapist,


• Vimeo,


• Yahoo!,


• YouTube,


• blip.tv,


• video.google.com,


• Soundcloud,


• InfoQ,


• Mixcloud,


• OpenClassRoom

Mozilla Firefox add-on:

^{Update: Merging my other answer for this post.}

This one's been my favorite Firefox addon: Flash Video Downloader

Currently supported sites:

• YouTube,


• Google Video (video.google.com),


• DailyMotion (dailymotion.com),


• Metacafe (metacafe.com),


• Break.com (break.com),


• Blip.tv (blip.tv),


• MyVideo.de (myvideo.de) and others.

Also allows for flash games download from:

• gamespot.com,


• community.games.com,


• armorgames.com,


• net-games.biz,


• gamesvine.com,


• zoopgames.com,


• flashgames247.com and more.

You can use "Easy Youtube Video Downloader" extension in Firefox:
Easy YouTube Video Downloader Add-on

I'm a big fan of jdownloader. It has plugins for most of the common video sites. You can choose at what definition you download from (on youtube at least, i'm not sure about other sites). It automatically runs url you copy for downloading, its a nice streamlined process. I suggest you try it out
https://launchpad.net/~jd-team/+archive/jdownloader. Add the PPA from here and install "jdownloader" (by the way, its written in java, its only downfall)

I would recommend this extension for Chrome http://grabanymedia.altervista.org/ translated into English, Italian, French, German, Portuguese

If you only like to watch the youtube videos, you can with vlc. Only thing you need to copy the youtube URL and paste to the VLC main window and hit Play (enter). You also can drag and drop the URL from the browser to the vlc main window with mouse or touchpad. It even easier.

How about you-get? Details is at the Git repository and the application could simply installed by $ pip3 install you-get. I have seen this program downloaded from YouTube and Vimeo.

For the YouTube videos, I use the Greasemonkey script YouTube Video Download

There are lots of websites that provides downloading streaming video . My favorite is keepvid.
It will support downloading of videos from

• YouTube
  


• MegaVideo
  


• Flickr
  


• Dailymotion
  


• Facebook
  


• Vimeo
  


• Metacafe
  


• and so on
  

All you have to do is enter the link of the video to the 'URL' search box on the top of the site and click the 'DOWNLOAD' button. It will generate download links of the video in different quality and format. Just click on one of the link that you like to download.