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line number miss?

hello everyone

       im working with DM6467 , try to decod and display 720P on screen.but screen captures nothing.

i make loopback test and has made sure H_syn/V_syn is OK.

after compareing with 720P camera, i find difference.camera has line number after EAV,but DM6467 hasn't.

VPIF_document only mentions 'L11 is regarded as the start line of the frame in the VPIF. The line number written is the same as the standardbook of BT.656 and BT.1120.'

so i don't know how to config VPIF to enable line number counting. may be i should change L11 in VSIZE_CFG2 but what value

 

Regards