Alan, how many cameras are doing LPC total? Where do they record, NVR or DVR?
In addition to the pre-record parameter, there is also a record delay parameter in the motion detection settings screen. Is this set to 0?
if it's a night time only problem you could consider scheduling VMD recording during the day and continuous recording at night, though I'm sure you would rather just make it work like it should.
2 LPC cameras recording on a HD-CVI/Analog DVR. Everything else is IP on a Performance IP NVR. Same issue on NVR and DVR. Tech support recommended testing another input on the DVR and then resetting it to default to start over. This dies not make sense since the issue is consistent on all inputs and both recording devices running very similar sofwtare. The recording devices were chosen because they both are compatible with the same mobile CMS (HONVIEW Touch).
The delay settings option is set to the minimum of 10 (10-300 is the range).
It's the same issue for day and night, as well as NVR & DVR. Daytime is not an issue as the gate's motion is readily seen and triggers the recording in plenty of time to capture all that's needed.
Everything works so it seems to be it should be a simple answer, like, "pre-record never works on these devices" or "XYZ camera somehow impairs the feature" or "Don't forget to check ABC setting for it to work"...
The gates are totally dark at night so this problem primarily affects 4 cameras. The exit gate LPC camera is not really an issue as the cars approach this gate slowly and headlight on the gate trigger the recording. The entry gate is triggered open by a keypad much further away so cars go by fairly quickly after the gate has opened (in the dark, motion not triggered). There is a keypad camera so I have use this camera to trigger an alarm from the NVR to the DVR and this helps capture the incoming vehicles' license plates.
The issue is very specific though so I can't imagine I'm the only one to have experienced it.
Thanks for the feedback.
I have not. I assume you mean a mirror to reflect ligth to trigger the motion detect recording earlier? If so, in this case I'm not sure where I could place it to make it work that way. Also aesthetically speaking, this is a luxury community so it would look odd and out of place I think.
It's odd that I can't get the pre-record to work on the DVR (HD-CVI/Analog) though. I checked the download center for a new firmware and nothing was available. I may have to deal with tech support again but when I initially raised the issue, the wanted me to try different inputs and if that failed reset the recording device and start over. Since both NVR and DVR behaved similarly, I didn't think that was the right way to go.
Is your NVR from Honeywell or straight from Dahua?... The Reflective tape is an option but it would be tricky. The camera is facing towards 11 AM and the cars go by facing towards 1 PM. If the gate is fully open, the headlight would not illuminate anything in the FOV. The trigger becomes the actual tail lights and license plate. Of course that's only one camera. The others are set up differently but are also less critical but still.
It just seems like the pre-record should just work based on the settings and motion detection response.
I do appreciate all the feedback and help.
PS: anti-dither to my understanding is supposed to affect how many events can occur in a given time period. Maybe it also determines the post event record time as well? I have it set at the lowest setting which is 5.