I'm not into web design anymore but there are video capture devices which used to be a pain in the ass but they worked.
I use GetRight to rape sites too for images. I do not think YouTube's video formats can get nabbed with it though.
Here is a link...there are so many progs out there though...
http://all-streaming-media.com/record-video-stream/screen-capture-software.htm
I cannot for the life of me remember the name of the program I used to use but it worked by taking the mouse and highlighting the area of the browser you wanted to record and it would record it at the click of a mouse button.