I am using ADV7441A in our HD Video Capture Card project, it works fine. We want support custom Y/Pb/Pr signals now, In the Hardware Manual, we found following description: 'Auto graphics mode is not limitedto graphics input only, it can also be used to support component video input'. We have done a experiment with it (INP_CSPACE = YUV-709, RGB_OUT, COEFF_AUTO), but we got a dark image, and when we set the A/B/C Clamp values to 400, 600, 600, the image looks fine.
My question is how to use auto clamp with Y/Pb/Pr input in autographics mode? and is there any other settings need to do for Y/Pb/Pr signals in autographics mode ?