Anyone seen this? Faulty image??

[Scott Drinkwater]

It shows on on playback only for a second at a time every say 30 seconds.

Not sure if its a camera fault or my NAS that is recording the data. Can't say I have noticed it when just on playback..

 

[dalepa]

It could be a number of different issues cams, network, nvr/pc... which cams, NVR/pc, etc are you using?

need more info...

 

[bp2008]

My years-old 5MP cams used to do this during the day, but not at night. The solution was to set the i-frame interval equal to the frame rate. This settings change has been known to improve video stability for a lot of cameras actually.

 

[nayr]

thats called tearing, its because frames are being dropped and every once and a while one of them was the ever important i-frame.. increasing i-frame interval can help alleviate the symptoms, but it does not fix the underlying problem.. that frames are being dropped, could be all sorts of things.

sometimes its poor udp performance, resource exhaustion, network bottlenecks, etc..

 

[Securame]

Are you doing constant recording 24/7 on all the cameras? You seem to have recordings all night long, but with many gaps.
I agree with nayr that you have a bottleneck somewhere, either network bandwidth, or most likely the HD on your NAS can't keep up with all the information it has to record.