I am having trouble in getting desired output from the TW2837 Video Mux chip. I am able to get four blue screens on TV separated by boundary lines.I am also able to generate the color bar test pattern.However when i connect a camera on any of the four input channels the respective display is just noisy , scrambled, running lines. I don't know what else to do ? if anyone has implemented it please help

 

Could be synchronisation pulses wrong,,, Best to post a circuit diagram of what you have then we can assist you further...