Any thoughts on what is causing this pixelation/noise/whatever at the top of my outdoor cameras?

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Are you sure its not the app you are using? Do you see the noise if you log into the camera directly and view the stream?  If it was just 1 camera I would say it was defective, but all 4 camera's its most likely something else.

does not appear on the camera web login.  Appears in blue iris recordings and camera viewer.

If I restart a camera, it will be fine for about 30 seconds, then the issue returns.

ETA:  Turns out it was a mixture of both the camera, and the software.  APPARENTLY turning on H.264+ in the hikvision online settings does that bullshit.

I think H.264+ should only be used with Hikvision s/w and/or NVRs.

could very well be, as the video was gloriously fucked up with that setting on.  it was like a half assed two stream video.

the background looked fine, but anything that moved was transparent.  like, a person walking by looked like a fucking ghost.  I could see the sidewalk clear as day, but the person walking I could just barely see their outline, and still see the sidewalk through them.