No need for getvideo or anything extern if Youtube decides to act up. Just don't subscribe to the HTML5 program and instead, just use the Youtube.js userscript. It's not affected by this "not available" thing.

Besides, unlike Youtube HTML5 player, it allows to get direct links and download the video (either by the direct links below the video or by the context menu over video element).

[ Edited by Fab 17.07.2012 - 13:38 ]