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a big white bar at screen bottom

Hi,all

 my board tv out is pal,720x576 resolving,direct input pal's monitor,but screen bottom a big white bar,i search many answer  ago,but not solve this program.

DVSDK Version 2.10.01.18, i try edit kernel file vpbe_encoder.c ,but  not solve this program,

picture 1,  

.upper_margin =0x2c,

.lower_margin=0, 

 

picture 2,

.upper_margin =0x42,

.lower_margin=0x42, 

no matter what adjust,the white bar go up and lower,but  total area no reduce,

hope give me a bit of  guidance. thanks.