dh-sd22204t-gn recording constantly at night

[mnsandler 0]

I have dh-sd22204t-gn (its a ptz with no IR) installed outside. I have it setup to record on motion. I use the Normal profile. During the day everything works fine; it records on motion only. However, at night it records constantly so all I get is a black image. If I turn on an outside light, it works fine.

 

I can turn the lights on via motion if necessary, but the camera will still record the darkness between motions.

 

I've tried messing with the image settings, and sensitivity & threshold settings, but it hasn't helped.

 

I have several other dahua camera installed outside, and none of them exhibit this behavior of recording a black image.

 

Any suggestions

[cctvnerd 0]

does the camera support dynamic noise correction/reduction?

 

maybe the black image causes too much noise and the "motion" alarm is triggered.

 

firmware up to date?

[mnsandler 0]

I turned the 2D NR and 3D NR from 50 to 100. it seems to help. thanks