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I have Dahua VTH2521F-P, VTO2202F-P, NVR4104HS and 3 x Tioc2 IPCs. The 3 IPCs are working on NVR fine. The VTO is working on the VTH fine. But I just can't get the IPCs to show video on the VTH.... when I add them to the VTH they just show as a black screen. When you add an IPC to the VTH...