Quick note: As this screen cap from After Effects shows, the dimensions Mec4D listed were for PAL TV resolution. Those of us in the US are in the NTSC domain. Unless P6 renders rectangular pixels (I don't have it yet so I don't know but certainly it didn't through P5), you would need to render from Poser using the "NTSC D1 Square Pixel" setting - 720x540 - and then convert to the 720 x 480 (DV) or 720 x 486 (D1) resolutions using another program.

Before they made me they broke the mold!
http://home.roadrunner.com/~kflach/