Fuzzy HD-CVI Video Sometimes...

[brycenesbitt 0]

Independent of cable brand, power supply, specific camera and encoding format... this fuzzy issue comes and goes, and sometimes but not always fixes itself if I power cycle the camera.

The porch image is a Lorex 4K camera.  The car picture a eBay special four mode camera 2MP.  The DVR is Lorex / Dahua ( https://techcrunch.com/2021/10/25/lorex-ezviz-pulled-from-shelves/ )

What could be up?

[tomcctv 190]

Hi are these images posted from the app ?

why do you want cable … power supply not talked about 

also need to know what equipment your using

[brycenesbitt 0]

6 hours ago, tomcctv said:

Hi are these images posted from the app ?
why do you want cable … power supply not talked about 
also need to know what equipment your using

The images are captured from the app, but just because that's easy.  They display the same on the DVR.
The equipment is identified in the original post.   I've tried several power supplies, including a 15V one (in the past I've had problems with voltage sag over a 50 foot cable).

[tomcctv 190]

45 minutes ago, brycenesbitt said:

The equipment is identified in the original post.

Ok lorex have over 20 types … and more if you include dahua units …. So no help

 

48 minutes ago, brycenesbitt said:

The images are captured from the app, but just because that's easy.  They display the same on the DVR.

This then points to a camera problem as you have the same problem on two format

 

49 minutes ago, brycenesbitt said:

I've tried several power supplies, including a 15V one (in the past I've had problems with voltage sag over a 50 foot

Voltage is not a problem over that distance 

it’s current (amps) that you need to be looking at 

and to do that we need to know cable type 

how connected … power supply … camera type 

[brycenesbitt 0]

The Lorex model is D841.  Several cameras do the same thing, but as before not always.  It can go weeks with perfect video, then days with the shadow.

The cable is the Siamese BNC/Power that came with the package.

The question I have for the forum is: have you see this effect before?

[tomcctv 190]

2 hours ago, brycenesbitt said:

The question I have for the forum is: have you see this effect before?

Yes lots of times and it’s down to cheap cable and wrong power supply 

 

2 hours ago, brycenesbitt said:

The cable is the Siamese BNC/Power that came with the package.

So these would be the cheap lead kits lorex send out …. They only last a year max 

power cable is too thin ….. so not getting the amps needed ….. plus it’s not 75ohm 

best of either coax (shotgun) or cat5 with baluns if you want the right picture quality 

your pictures look nothing like 4K 

 

 

[brycenesbitt 0]

9 minutes ago, tomcctv said:

your pictures look nothing like 4K 

 

 

Only the porch cam is supposed be 4K.  The Lorex 4K is fake anyway, there's not enough optical quality in the lens.

The driveway cam is "1080p".

 

[brycenesbitt 0]

**Update:** I have inserted an extra 75' coiled loop of cable to CAM1 both power and video.  At this time the issue is not happening with or without the extra cable.  But the video is stable.

[tomcctv 190]

2 hours ago, brycenesbitt said:

**Update:** I have inserted an extra 75' coiled loop of cable to CAM1 both power and video.  At this time the issue is not happening with or without the extra cable.  But the video is stable.

Why ???

[brycenesbitt 0]

4 hours ago, tomcctv said:

Why ???

Because 
1) If voltage or signal is weak, adding the extra cable will make it weaker. Since it works with the extra 75', I know that raw signal strength volts and amps are all fine.

2) If the issue is a signal/impedance reflection in at the cable ends, then with the extra length the offset of the ghost image will be larger.  This may help in tracking down the cause.

Now I just have to wait for it to fail.

[file 0]

This looks kinda like a problem I have, so I'll avoid opening a new topic and ask for help here.

Any ideas what could cause this;

 

 

Camera is DH-HAC-HFW1200, utp cable with video baluns under 10m of length, 6A power source. Two of the cameras have this problem when on IR, third one doesn't... It's happening every 10 to 15 sec