I think that I am dealing with the same issue. I am trying to composit HDV video with a 3D render (output as an image sequence) that came from Maya as 960 x 720, square pixels. When I bring it into the comp, its resolution seems less than it should be. I wonder in the animation was rendered at the wrong size. What should the rendered footage’s size be to composit it with DVCPRO HD 720 (1.33) with a pixel aspect ratio of 1248 x 702?