There are numerous Addons and Extensions for Web Browsers to download and even convert the downloaded video to your desired format. However, if you are thinking of making a script or a program to download it without the browser, this post is what you need.
Run the following command to install the program:
sudo apt-get install youtube-dl
To download any video, open it in the browser, copy the URL and paste it in the following command:
youtube-dl -o [filename].flv [Copied URL]
If you didn’t provide any path with the filename, it will download it to your home directory.
Fixing Download Errors
In case you get the following error message:
Try the following to fix it:
sudo -s youtube-dl -U youtube-dl -t [Copied URL]
Entities provide a safe way for displaying special characters on the web page.