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

[JesseSR]

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)

 

[JesseSR]

I think I might have answered my own question... Is it here? for each channel I need to set it to 15?

 

[Davahad]

Any ideas on this @EMPIRETECANDY?

 

[EMPIRETECANDY]

@JesseSR he found the right place to make the setting.

 

[Davahad]

@JesseSR he found the right place to make the setting.

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.

 

[paul@austins.tv]

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?

 

[tigerwillow1]

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.

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.

 

[Davahad]

@EMPIRETECANDY Is it possible to ask Dahua to add prerecord for events when recording 100%?

 

[JesseSR]

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?

@EMPIRETECANDY -- can this be fixed with a firmware update? I have a DHI-NVR6A08-32-4KS2 NVR.

 

[Davahad]

@EMPIRETECANDY Looks like this is not possible. Any chance of getting Dahua to add?

 

[EMPIRETECANDY]

I will ask them to review, this have to make a special project, add this kind of function to a baseline fw need budget

 

[djgarn]

Having the same issue too.

 

[André B]

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.

 

[duplo]

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.

because you record constant + ivs
if you record both, then pre-record will have no effect

all dahua nvr have this "feature"

 

[Nunofya]

because you record constant + ivs
if you record both, then pre-record will have no effect

all dahua nvr have this "feature"

Where do you change the settings?

 

[duplo]

Where do you change the settings?

what settings ?
if you want pre-record for ivs, you have to turn off constant 24/7 record.
they name it general.

if you want both, then you have this nice feature aka BUG.