Dahua cams/NVR dropping frame sections right at the money shot

[mat-with-one-t]

Hi all. Firstly, thanks for all the help for this here new guy - I'm getting the hang of all this!
Now, Here's my kit:

Dahua DHI-NVR5216-16p-4ks2e

Cameras so far:
1. IPC-t5241-as-pv 2mp 2.8mm (same as IPC-hdw5241h-as-pv
2. IPC-e3541f-as-m 5mp 2.8mm (same as dh-ipc-hdbw3541f-as-m)
3. IPC-t5442tm-as

I've noticed that, when IVS is set and a rule is tripped (such as tripwire or similar), and it's noted on the NVR GUI timeline draggy-bar-thing (as denoted by a coloured stripe of some sort), and I play it back under the "search" function, there is invariably a brief blank pause in the stream! Normally I wouldn't care, but it seems that this consistently relates to the most interesting sections of video! Hmmm.....

 

[bigredfish]

Have you tried actually exporting 10-15 econds of video containing the event and see if it actually skips frames or maybe its a glitch on the playback function of the machine?

 

[aristobrat]

This sounds like the old issue where IVS clips weren’t starting with an iframe.

 

[bigredfish]

it does... wasnt that solved with a firmware update?

 

[Fastb]

skipped frames due to IVS:

Setting up IVS tripwire...

I'm trying to figure out how to get the tripwire functionality on my camera working. I'm recording to the NVR. On my NVR I set to record when IVS events occur: On the camera I setup the tripwire: However, I never get anything recording. Am I missing something here?

ipcamtalk.com

Skipped Frames on MD/IVS/Alerts while recording to on-camera SD card

@aristobrat @nayr @EMPIRETECANDY I know this has been discussed on the thread regarding the NVR. I just received my cameras the other day, I was doing some bench testing. I set up two cameras (IPC-HW5231e-z5) as LPR, I set up intrusion zones on one camera, and ordinary motion detection on the...

ipcamtalk.com

Upon an IVS event, the NVR records to a new file. So it closes one file, opens another to record the IVS event. On the NVR, check the "files" log,. In the list of files, you'll spot the time stamp of files that coincide with IVS events.

The above links provide insight.

I haven't seen a fix. I just deal with in, unhappily.

Fast b

 

[bigredfish]

hmmmmm I dont have the problem on 4208 or 5216/32's....?

Here's a sample today



Video from the above shown IVS event

View attachment HOA Entr_ch4_20200621122020_20200621122036.mp4

 

[bigredfish]

And here's one exported straight from the NVR



View attachment NVR_ch4_main_20200621125306_20200621125319.mp4

 

[mat-with-one-t]

hmmmm/ I'll look into it. Thanks for replies so far....

 

[bigredfish]

Note that in both cases above, using SmartPSS and direct from NVR, I’m recording 24/7 PLUS IVS.

On both I use the timeline and scissors to define and clip thus getting a few seconds of video before and after the actual IVS triggered event.

I’ll try exporting only the IVS event from the file list .... standby....

 

[bigredfish]

So downloading individual IVS clips can be done, but not intuitive maybe. I just learned this today after reading this thread:
Dahua NVR5208 saving Playback files problem. Download option missing.

On the 4.0 interface, go to Backup


Then you can choose type of file, download by file or time, and export dav or mp4


Here's the output from a single IVS Tripwire event
View attachment NVR_ch4_main_20200622012849_20200622012901.mp4

 

[mat-with-one-t]

My version (which I thought was the latest?) is

V4.001.0000000.1, Build Date: 2020-03-19

I don't have "Backup" as a selection option.....

Also, just out of curiosity, why did you go with 2 tripwires - one squiggly and one straight?

 

[bigredfish]

One for the crosswalk and one for vehicles. Different active times for each. The crosswalk is only active after midnight, the vehicle line 24/7

 

[mat-with-one-t]

Could I get a hand here? I continue to get the issue of playback looping/missing when using the main Web GUI under "search" or "AI". I watched the (very useful) video mentioned above:

Dahua NVR5208 saving Playback files problem. Download option missing.

When I log into a cam, and then go to "Playback", it only gives me a (not installed) SD card as an option as a data source. I obviosly need to add the NVR as a recording destination, but I had assumed (perhaps incorrectly) that it would be the default recording destination.
So, what do I need to do? I see a "Setting>Storage>Destination" pathway, but I don't ssem to be able to figure it out.
Thanks!
Mat

 

[biggen]

Have you read the DahuaWiki on adding cameras to an NVR?

 

[mat-with-one-t]

yep been through all that I think. I just tried swapping to Explorer 11 (just to try the GUI with that) and it seems to have stopped the loop/stagger problem when playing back triggered footage. Good.

 

[dcmkii]

do you get lag/stagger when the continuous recording hits the motion detection/ivs sections?

 

[mat-with-one-t]

Yep that was the issue. Would play along fine until hitting a "triggered" section (motion/IVS/tripwire), then would blank out briefly, then play a loop around and around with same blanks each round.
For people's interest, I never use Explorer (horrible), but I read this didn't happen using Explorer 11, so I gave it a go and voila! Fixed.
So henceforth I'll view NVR stuff via the GUI using Explorer......

Still can't find recordings via individual cam GUI's like in the above video. Hmmm....

 

[dcmkii]

i found viewing the videos from the desktop Smart PSS to be smoother than web based GUI.
However, viewing directly from the nvr is the best quality.