DivX pixel widths that DVP642 "likes"?

I've been encoding some stuff to DivX using autoGK for playback on my dvp642. Since I'm no expert I've been using the auto width setting. The results have been generally very good. However... some of the files created from "widescreen" sources have the edges "chopped off" during playback. No distortion (squishing/stretching) just the edges going "offscreen" on the TV set. The full image is there in the files (aspect ratios look correct on the PC using DivX player). Can anybody tell me what pixel widths this player displays correctly, er... "likes"? Any help would be much appreciated.

(edit)Oops, meant to post this in the "Philips dvp642 dvd and divX player" thread. I'll copy it over to it. Duh...