I have a DivX avi which checks out fine in VirtualDub, but the frame size is 640x304. I'd like to convert this to SVCD using DVD2SVCD, but TMPEGEnc complains about resizing it to SVCD when I get to that stage. It appears to convert ok if I choose VCD, but I cancelled it as the aspect ratio was clearly squashed. Is there a way I can fix this manually without doing all the steps by hand?