Make sure to use the mouse right-click, to copy the video url and not the shortcut Control-C!
Remember that, although Control C is the shortcut key to copy to clipboard, it is also a way to terminate the running application in the terminal. Therefore, you should highlight the video url and use the right-click context menu to copy the video url to the clipboard.
It would be cool if there was a way to override control c, in the application, to allow the shortcut copy to be used, instead of terminating the application.
Allan Clark10,800 Points
It all depends on what is your active window. If the running program is the active window then yes it will receive the terminate command if you give it ctrl+c. If you have a browser or other window as your active window, there is no way for the program to receive the ctrl+c command, allowing you to shortcut copy all you want with the program in the back ground.