Two cameras go green every night

[uros76]

Hi. I have a weird problem where the same 2 cameras (out of 4) show up green on my ZM server for a short period every night at the same time. The other two cameras are not doing this.
All 4 cameras are IP cameras from HihVision connected to UTP cable and powered with POE. ZM server is v1.36.33 installed on the latest Ubuntu.

Attaching screenshots of those green anomalies. I checked camera settings and they are all the same.
Any idea why I am getting this every night?

greens.png (331.92 KiB) Viewed 2579 times

[bbunge]

Is GMT your local time? If not do the cams go green switching from day to night?

[uros76]

No. I am on CET timezone.
Also no. When the night or morning comes it's all good. They do not turn green then.

It's really weird I still can't figure out what is causing this.

[iconnor]

In 1.37 I have been debugging long standing issues that only occur on some cameras. What I have determined is that the clock on the camera jumps back (or forward) in time. This is basically because the internal clock is really bad, and ntp is making a correction every hour. Some cameras are set to update their ntp time at a greater interval (1440m). So in 1.37 now, we kill the capture and restart instead of getting a corrupt video. Am trying to figure out a way to get the cameras to update their clocks more frequently.

[iconnor]

Another thought here is that logrotate runs at midnight every night and will cause the monitor to start/restart capture. Shouldn't result in green, but maybe that's it. You can trigger it anytime using sudo zmdc.pl logrot

[uros76]

In 1.37 I have been debugging long standing issues that only occur on some cameras. What I have determined is that the clock on the camera jumps back (or forward) in time. This is basically because the internal clock is really bad, and ntp is making a correction every hour. Some cameras are set to update their ntp time at a greater interval (1440m). So in 1.37 now, we kill the capture and restart instead of getting a corrupt video. Am trying to figure out a way to get the cameras to update their clocks more frequently.

I think you might be on to something. I just checked those two cameras and both of them have NTP enabled for a time sync. Other cameras (without the night green effect) have manually set time.
I just disabled the NTP sync on problematic cameras and will see if that helps.