In this article I will cover the bookmarklet because it is the simplest to use, does not require the installation of any add-ons, and it’s the simplest to install. Simply click the All-In-One Video Bookmarklet below and add it to your bookmarks. Alternately if your bookmark toolbar is available, you can simply drag the link below to your toolbar and it will automatically appear. Now you can just browse to your favorite website, Youtube, Google Video, and others; find the video you would like to download and click on the bookmarklet that is displayed on your browser. It will prompt you to download the video …choose a directory and save, you are now done! If you have any comments/suggestions or need some help, please let me know.
Script Source: 1024k.de
"The bookmarklet has been tested successfully with Mozilla (1.7.13), Firefox (22.214.171.124) and Opera (8.54). It will not work with Internet Explorer (6.0) due to IE’s limitation of URL length (some of the old links will)."
The videos you download from these websites will be saved for the most part as FLV files. In order to play these videos you need to either convert them to another format (you can view the tutorial here) or you can download any of these players listed below.
Frequently Asked Questions can be found here.
Script and Bookmarklet Author Page
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