what is the relation between IP cam fps and NVR fps ???

[raji 0]

Hi friends,

 

i couldnt able to explain my client why he has to go for 60 fps ip cam and 120fps nvr. pls tell me the advantage if i increase frames per sec in cam and in In NVR???

 

pl help me in this regard.

[MaxIcon 0]

FPS ratings for NVRs are a holdover from analog days, and generally shouldn't apply to IP NVRs.

 

The NVR spec is usually total for all channels. What you really care about is the bit rate capacity of the NVR, as that's what should set how many cams you can use and at what settings. For instance, a 40 Mbps NVR will determine how many cams you can connect set at 4Mbps vs 8Mbps.

 

For the cams, you don't need 60, 30, or even 20 fps in anything but special circumstances. Again, IP cams care more about bit rate, so a given bit rate (say, 4Mbps) will determine how large the files are and indirectly determine the quality.

 

Many people use 10 or 15 fps for surveillance, some even less. More FPS generally requires a higher bit rate to maintain a given quality. Once your bit rate is set, changing the frame rate or resolution won't affect how much data the NVR gets and records. Likewise, changing the bit rate will increase or decrease the data size per minute, regardless of the frame rate or resolution.

 

If your customer is running a casino or watching very fast events, they might need high FPS. Most users watching a business or store get by fine with 10 fps.

[Don Stephens 0]

FPS is definitely just an annoying carry over that most sellers still use to advertise NVRs. The only thing I can figure is that they assume most people aren't going to know it any other way than that.

 

There's obviously a lot of confusion as a result.

 

I never know how to make this simple for customers who don't understand the technology in general. Hopefully you can just explain it like MaxIcon did, and your customer will just accept it without understanding it and move on.