Dahua NVR -- where to set pre-recording seconds for IVS rule

JesseSR

JesseSR

Getting the hang of it
Aug 21, 2021
134
85
USA
Remind me on a Dahua NVR, where you go to set the # seconds it should pre-record for a camera's IVS rule?

For example, if my IVS rule is triggered, I want the camera to record the 15 seconds BEFORE the event happened as well, so in my DMSS app I can easily see what led up to the IVS event trigger...

(hopefully that make sense -- I assumed this is on the NVR, not the individual cameras)
 
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EMPIRETECANDY said:
@JesseSR he found the right place to make the setting.
Click to expand...
Tried that settings and it does not effect playback start time for IVS events on the timeline. When checking IVS events how do you do start them xx seconds prior to the event? Typically when viewing IVS events I only select these so it is easy to jump from one event to the next. However, if you need to see what happened 5 seconds before the event triggered you have to re enable the General (all video) and then manually get there by selecting on the timeline just before the event triggered.
 
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This has baffled me as well!
I think if you have both constant and IVS recording. The pre-record doesn't work.
If you have just IVS recording then it does pre-record for your desired time length.
Could be wrong?
 
paul@austins.tv said:
I think if you have both constant and IVS recording. The pre-record doesn't work.
If you have just IVS recording then it does pre-record for your desired time length.
Click to expand...
This is my experience too. I was very disappointed when when realizing this reality. It was really bad a few years ago when there were dropped frames on an IVS trigger and whatever caused the event was often totally lost. At least that part has gotten better and you can see what causes the event, just more work than it should be.
 
@EMPIRETECANDY Is it possible to ask Dahua to add prerecord for events when recording 100%?
 
@EMPIRETECANDY Looks like this is not possible. Any chance of getting Dahua to add?
 
I will ask them to review, this have to make a special project, add this kind of function to a baseline fw need budget
 
Did anyone solve this issue? Doesn't seem to matter if you have a 5 or 30 second pre-trigger. The clip will start in the middle of the trigger no matter what I do.
 
I also experience the same problem, crazy that Dahua has not resolved this bug with an update after more than 2 years.
 
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Almost one year later and still not fixed. This is really frustrating because it means I'm forced to disable general recording (which I want at a lower resolution), just to be able to see in full res what happened a few seconds earlier. Has anyone come up with a workaround or solution? Or do you just choose between one or the other and accept the concession?
 
Corvus85 said:
Has anyone come up with a workaround or solution? Or do you just choose between one or the other and accept the concession?
Click to expand...
A not very helpful response I realize, this is one thing that works correctly in BI. I'm not trying to sell BI because there are some things that work better with the NVR. When you pick one, you're blessed with it's particular good features, and stuck with its particular shortcomings.
 
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