Over decode ability

[Jomsha]

Hi,
I have NVR Dahua 4208-8P-4KS2
and 8 cameras Dahua HFW2431s-s2 (4MP)
And always receivING the message Over decode ability.
And the last camera is not showing after that.

Please help me

Thanks in advance

 

[SouthernYankee]

More than likely You have exceed the capacity of the NVR to process the video for display. Look at the specs for the NVR and calculate the load you are putting on it.

 

[Jomsha]

Thanks for answering..
In the settings I see im using 170mb / 200mb
Why still over decode ability?

 

[SouthernYankee]

read the specs, you are on the edge. Test, Disable one camera.

2ch@4K (8MP)/ 8ch@1080P (2MP)decoding

You are using 8@ 4MP.

What is your FPS ? If it is 15 you are on the edge, More than 15 you are over the top.

 

[cmos]

I had a similar problem, setting the cameras up for 265 encoding seemed to help.

 

[Jomsha]

That was my first attempt.. then I got the "over decode ability" message and changed all to h264.
And again getting this message...

 

[cmos]

Another thing you can do on the live view is to display the sub stream instead of the main stream on a few of the cameras.

 

[Jomsha]

Nvr will display on monitor the sub stream?

 

[cmos]

I believe so, in the manual it is called Preview Control Interface. Far right.

 

[mat200]

Hi,
I have NVR Dahua 4208-8P-4KS2
and 8 cameras Dahua HFW2431s-s2 (4MP)
And always receivING the message Over decode ability.
And the last camera is not showing after that.

Please help me

Thanks in advance

FYI - this is why you want to spend more getting a more powerful NVR or a VMS + more powerful PC. ( in terms of Dahua NVR, getting the 52xx instead of the 4xxx series )

Over Decode = NVR attempting to work too hard to display the videos.

Use the camera's substreams to reduce the amount of work to display on the screen, or use a separate PC to run your display terminal.

 

[Jomsha]

Maybe this is the problem?
4 cameras low bitrate
4 cameras high bitrate
Not make any sense. Its all same cameras, same encode configuration. No movement at all.

 

[mat200]

Maybe this is the problem?
4 cameras low bitrate
4 cameras high bitrate
Not make any sense. Its all same cameras, same encode configuration. No movement at all.

Hi Jomsha...

The NVR primary job is to record the video stream to the HDD ... display is the next one. The NVR is unable to display all streams you are asking.. you can be asking it to decode too many streams which are too large for display.

 

[Jomsha]

Im new to the IP cctv.
Had AHD 8 cameras before no problem
Now its always 'over decode ability'.. im clueless

 

[sebastiantombs]

Think of it as trying to get 100 gallons of water through a piece of 1/8" tubing in less than a minute. Too much data for the NVR to handle is the basic problem. IP is different than CVI and somehow I'll bet your previous cameras weren't 4MP.

 

[Jomsha]

When the monitor is split into 8 , I dont care it be even 2mp or 720p. Really.
But when im opening 1 camera alone. I need it full resolution..
Can it cure the problem I have ?

 

[mat200]

Im new to the IP cctv.
Had AHD 8 cameras before no problem
Now its always 'over decode ability'.. im clueless

Buy a more powerful NVR if you want to decode that many streams, OR reduce the decode load.

CCTVs - analog cameras traditionally do not encode, the cameras had limited processing power .. they would just stream to the DVR...

 

[Jomsha]

Reduce decode load? What do you mean?
Affect encoding(recording)? Or just decode ?

 

[Jomsha]

By the way. All the cameras set to 6144kbps.
The NVR is capability of 200mbps
8 x 6144 = 49,152 kbps
So why its too high for the nvr?

 

[SouthernYankee]

TEST DO NOT GUESS.

You are confusing input with output.
It stated the spec limit above max 8 1080P cameras for decode. You are over that limit.

 

[alastairstevenson]

It's not the incoming recording bandwidth that's causing the limitation you are seeing. That video is already encoded, it's been encoded by the camera.
But the encoded video needs to be decoded for viewing on the VGA/HDMI interface and has a limit set by the available processing power. This limit can be seen in the NVR spec for decoding.

If you view the video via a PC you can offload some of the decoding load on to the PC and get closer to what you are looking for.