tmpgEnc detecting source on MPEG2 files as 320x240??

[blahh]

I have captured MPEG2 using ATI All in wonder when I try to encode it using TMPGENC to MPEG2 but at a smaller bit rate, I am not able to "see" the entire frame after TMPGENC encodes it.. Even in the preview window the frame is not alligned correctly... I have "fiddled" around with the settings, I am suspecting that I need to correctly configure the SOURCE correctly. I have tried All different aspect ratios and no luck, I am always missing a part of the frame (pretty much 25% around the entire edge of the frame?
If I go to "clip frame" it detects that the input format is 320x240 even though I have encoded it with ATI All In Wonder and have specified it to be 480 x 480, There is no were to specify the resolution of the source in TMPGENC, If I view the original capture file it is 480X480 but only when I bring it into TMPGENC do I loose this 25% around the boarder of each frame.????
Please, any assistance here would be greatly appreciated....
Thanks in advance..

Blahh.

[blahh]

FYI,
I found it was because of the m2v-vfp plugin for TMPGENC once changed the aspect ratio option, things were much improved.