Some videos don't play in widescreen

I have encoded a bunch of widescreen videos to XVID/AVI files. Only some of them play in widescreen, the rest are in 4:3. I encoded them all in the same resolution 720x400. All of the videos playin widescreen on my Xbox 360. Anyone have any idea why only some would play on the WDTV? Is this a known issue?

Also, I should mention that that I have my WDTV connected to my TV with component cables and the WDTV is set to 720p. I’ve tried streaming the videos from my WD My Book Live NAS and playing directly from a USB drive with the same results.

Please post the full TEXT output of MEDIAINFO for a file that’s not displaying in widescreen.