There does seem to be some mosquito noise, but that isn't really the problem that seems to appear on the projector screen, at least to my eye. What is a quantizer characteristic exactly?

http://files.filefront.com/Wedding+Ceremony+A+Camera2zip/;11075637;/fileinfo.html

Here is a video of the projector playing the video clips. The flickering artifacts are an accurate representation, not an artifact of the camera filming the screen. (Look at the officiants forehead, and the car's hood)

I will try a vertical blur next, and see what results that brings.