I have the opposite problem. I've down converted 720P video in to many different mp4 formats to try to reduce the size to the Captivate screen. Most of them play the sound but the picture is blank. Some of them play, but the screen gets stretched really wide and skinny. i've tried 720x480, 800x480 and a few others. Also tried 4x3, 16x9 and "square pixels".
What is the exact mp4 resolution and specification that I should be going for? I am using the Adobe Suite, so I can put it in basically any format know to man...