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Probelm connecting two DM37X cards

Other Parts Discussed in Thread: DM3730

Hi

Im having probelm connecting Dm3730 video analog cvbs  output to another's card video analog cbvs input in order to diplay a video that is on the first card on the second card Lcd

Im using v4l2 video interface  to get the analog output from the first card, but when i use Vidioc_S_INPUT on the second card to see if there's any video signal on it's input it returns an error which means that it doesn't recognise any analog video signal on it's input.. So is the problem with the output of the first card or what.. Any help??