I was watching http://www.youtube.com/watch?v=LIFNLDQU0VQ and the first thing I noticed was the small watermark in the upper left corner.
What (open source/free) software allows one to do that? I'd very much like to watermark my gameplay videos, since I do a lot of them.
Edit: Resolved!
Nevermind, I was totally blind. Thanks to those hints here:
In VirtualDub -> Filters -> Logo... me = fail!
