Thanks Tex for the reply
I already saw that site when googling but it's still fuzzy to me
Right now I am experimenting with x:y coordinates. I am beginning to grasp it just a little bit, but not there yet.
The new ffmpeg broke the tovid package, a suite of tools to create DVDs. But, I fixed this by upgrading tovid to 0.34. This version uses the new pad filter of ffmpeg.