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Problem DM8168 lower 1080P video contrast use dvrrdk4.0

Hi all:

I develop on dm8168 use dvrrdk4.0.

In my application i capture 1080P from DVI through ADV7604, 

and i use captureLink DeiLink nfsLink swMs Link DisplayLink, I found the Contrast lower compare with the original video,

how can dm8168 make the video blur?

And black is gray

Follow the is the contrast picture: