Overscan. Yes, I just lost a day of my time to overscan. Traditional TV sets do not show the entire image they receive from broadcast or DVDs. They cut off 8-15% of the image around the edges. This is to make sure there is not black or other border around the image, much like one does in a printing process. This is fine for an Avatar DVD where one might lose a few leaves in the jungle at the edge, but when I am projecting charts in one of my climate videos, it tends to cut off axes (when one is working with only 480 vertical pixels (traditional DVD resolutions) it is hard to get detailed charts to project well anyway, but losing resolution to overscan is a further pain. Making the situation more complicated, DVD's played on a computer or on some (but not all) modern flat screens do have have overscan.
Anyway, I am mostly done, and will post my latest effort here soon.