Educational LINKs (i.e.Live Video Viewing over LAN)

[DClark]

Greetings,

Viewing video on a large system, 300+ locations (50 states) each with their own DVR, 16 to 64 cameras per location, and System is managed through a centralized server.

How is the Live video viewed in relation to the DVRs on remote VMS stations.

Is the LIVE video 1st copied to the local DVR then broadcasted.

OR

I had always thought the LIVE feeds were picked up off the network, hence saving r/w work on the DVR.

Any educational links would be great!

Thanks

 

[SouthernYankee]

A DVR is a Digital Video recorder, it normally uses coax.
An NVR is a network video recorder, it normal uses ether net cable.

Your question can not be answered with out a network diagram. With IP addresses and equipment make and model.

In a normal corporate surveillance network, cameras are on a separate network or on a separate subnet. The are not visible to the internet and are not visible to normal employees. To access a live camera you must have access to the local network and either log into the camera or Login to the recording device.

 

[DClark]

Yes , officially embarrassed , meant NVR, thanks for the post.

I was thinking more in general terms, the system would be on its own separate network. Its an IP system, with encoders on all the coax cameras. All the NVR's and encoders are Axis, with a mix of cameras.

Experiencing slow download speeds and choppy live video feeds. Addressing this by adjusting the FPS settings at the locations, and slimming down the number of live views being monitored.

I had though the "slowness" was a two part issue, first, retrieving/viewing saved video, Second viewing the live feeds.

Investigating how the live video interacts with the NVR's read/wright performance and how much of the NVR's available throughput is affected.

I was informed by one of my techs (manufactures rep) that the performance is slow due to the fact that the LIVE video is being taken off the NVR's disk, when I asked to clarify, so the video its saved first then broadcasted to the VMS locations, answer was yes.

This does not seam to be an efficient way of managing the NVR's load.

Getting a bit winded here sorry,

Thanks Again

 

[SouthernYankee]

Most NVRs are limited by the amount of processing of video, both input and output bits per second. You will need to look at the NVR specs. Most POE style NVR require the NVR to process the video before sending it on.

It is possible when using a none POE nvr with the cameras on an accessible network to directly access the camera video.