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NVR Message "It has Exceeded the bit stream Limit" - How to solve it???
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Techpro Security
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March 27, 2013
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April 9, 2013 - 3:49 pm
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A customer call us today about an issue with his NVR and an error message displaying n the screen every time he add a megapixel IP camera. Here is his issue and I will show you how to resolve it:


------"Customer Issue"------

"I have successfully set up my 16 camera system NVR System with 8 cameras, however when adding camera 9 I get an error "it has exceeded the bit stream limit. Please close channel 9".
Would you advise me on where and what settings I need to change. I will eventually have 16 cameras on this system. I originally only purchased 12 and cannot get more than 8 cameras working."



The issue he's having is that the NVR reached the maximum amount of frames available when adding the cameras. See the way it works is as follow:


Configuring the cameras at 1080p the available FPS (Frames per Second) will be 120FPS.

Configuring the cameras at 720p the available FPS (Frames per Second) will be 240FPS.

Configuring the cameras at D1 (704 x 480) the available FPS (Frames per Second) will be 480FPS.


In order to figure out how many FPS each camera(s) (Up to 16 Cams) our Hybrid DVR and NVR can handle based on the resolution the camera is configured, you will need to do the following formula: {FPS /  (Camera Amount)}. The result will give you the FPS each camera need to be configured.


Example: If you want to connect 16 cameras at 1080p, then you will divide 120 (FPS) by 16 (Cameras to be connected to the NVR/DVR). The total amount of frames each camera need to be configured will be 7.5. Although 7.5 FPS is not something available in the DVR/NVR, then you will need to configure them at 7FPS each.

Same principal will apply If you want to connect 16 cameras at 720p, then you will divide 240 (FPS) by 16 (Cameras to be connected to the HYBRID DVR/NVR). The total amount of frames each camera need to be configured will be 15.


Lastly, you will need to pay attention not to exceed the maximum amount of MB/s which is 32 MB/s. You can divide 32 by the maximum amount of cameras you are connecting to the HYBRID DVR/NVR, (Up to 16).



Hope this helps to anyone who's having this problem!








New Member
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May 18, 2013
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May 18, 2013 - 4:57 am
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So if I get this right, with the 16 channel NVR (@120fps) you can either view:

in realtime (30fps) :   4x 2MP (1080p) cams or 8x 1MP (720p) cams   or

at 15fps:  8x 2MP cams  or 16x 1MP cams


OK so some questions on this if I may.

Does 15fps offer reasonable viewing? Do you have a video to show 15fps?

Can your 16 channel NVR take a 3MP (or a 5MP) camera and if so how does that effect the number of cameras I can put on it?

Is this spec for viewing or for recording as well?

Where does the 32MB/s come into the equation?

Does your system take any of the new D & E series ACti IP cameras?

Your software and apps look great but not sold on the hardware just yet.  If you had something equivalent to a ACTi ENR-1100 that would be great.






Brad Besner
Boca Raton, Florida
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May 18, 2013 - 8:46 am
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You are correct about the breakdown of the network camera connections. Basically you have 480fps available for D1, 240fps available for 1MP or 120fps available for 2MP. So if you were working with 2MP cameras, then you could connect up to 16 2MP cameras at 7fps each, or 8 2MP cameras at 15fps each, or 4 2MP cameras at 30fps each. If you were working with 1MP cameras, then you could connect 16 1MP cameras at 15fps each, or 8 1MP cameras at 30fps each. 


15fps is very reasonable for viewing. In most cases a person will not notice the difference between realtime and slower frame rates until they reach 7fps. Even 7fps is very reasonable for security video. Remember, this means that you are getting 7 individual frames (pictures) every second. So with 1 minute of video, you will have 420 images to review for evidence. When using Megapixel video, 420 images for each minute is plenty for almost any security purpose. 


Here is a video sample of D1 at 30fps http://www.securitycameraking......deo-Sample

Here is a video sample of D1 at 7fps http://www.securitycameraking......deo-Sample

Both videos were taken at the same time. 


Our NVRs support up to 1080p (2MP) resolution. This is both for viewing and recording. 


The total throughput of any network device is measured in Megabit Per Second (Mbps). Each camera has a certain amount of throughput. This can be adjusted based on the video frame rate, the resolution and the video quality. The maximum total throughput is 32Mbps. This will work out to the same as the resolution and frame rate limitations we already discussed. 


Here is a list of known compatible IP cameras, but most ONVIF standard cameras will connect. Some will have limited functionality. You will have to find out if the specific cameras you are interested in are ONVIF or not. I do not believe that ACTii cameras are a superior product in any way. I would urge you to consider our cameras if you plan to use our NVRs. 


The ACTii ENR-1100 is inferior to our NVRs according to their specification sheet. It supports the same resolutions but only a maximum of 9 channels or 270fps. The maximum throughput is 36Mbps which is only slightly better than our 32Mbps. It only has one local video output. Ours have 2. It only allows 2 remote connections at one time, ours supports 10 and on some units up to 20 remote connections at once. They only offer web browser for remote access, we offer our video management software as well which has much more functionality. I am sure there are many other features on our unit they do not have, but their specifications are very limited. 






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