Use of ADV7189B to decode NTSC SDTV

Question

I am using the ADV7189B with NTSC input, and wondered whether there is a straightforward way of adjusting the start of vertical grabbing - I have a problem where there is black at the bottom of the image and missing data at the top. I have tried playing with NVBEG/NVEND but it doesn't quite resolve the problem. 
 thanks, Andrew.

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Use of ADV7189B to decode NTSC SDTV