Valid width/height for MPEG?

zardoz wrote on 2/24/2005, 2:10 PM
The Situation: I have some 180x120 (pixel aspect ratio 0.9) and 120x180 (pixel aspect ratio 1.1) projects that I want to convert to square pixels, and output as MPEG.

The Problem: When I change the projects to 180x132 (square pixel) and 132x180 (square pixel), the MC MPG renderer refuses to accept the height and width.

The Question: What are the constraints on width and height for MPEG?