I hope it's okay to resurrect this old topic, but I experience the very same scenario.
Centering is automatically for low resolution videos, but
completely hides the bottom (and some of the right side) of high resolution videos (also see the still true
Window X,Y coordinates won't work?).
While the top left corner is technically centered, it makes the rest of the video appear bottom right. Can anything be done so the center will show the whole video?