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DM8168EVM with tvp7002 gives blurred video

Other Parts Discussed in Thread: TVP5158, TVP7002

 I'm using DM8168 EVM + Daughter I/O card (with two TVP7002 on it ) to capture 1080I/ YPBPR video source now. The software is  DVRRDK4.0.  Because the usage of TVP7002 on A8 side seems not presented in the SDK,  I realize it myself refering to the usage of TVP5158 which is given.  Finally when I  run the demo ( OPT.3   VCAP+VENC+VDEC+VDIS   HD progressive.), most of the result is correct except that a grey semitransparent  mask covers the video window.  Under it , the video is smooth. The grey mask will also appears a short time  during demo is initialled.  If  video source is removed , the mask become a totally grey background..  I have checked the config of TVP7002 many times , but it dosn't like the error . So could somebody help me?  Where and  how should I check?