Ghosting issues

[AgentShawn]

I might be choosing a bad term.

This is what is going on:

I'll move the PTZ, and a trail of the images will be slightly left behind which is what I'm referring to as "ghosting". If there is a different term, by all means, please correct me.

What could be a solution to stop this for Dahua IP cameras? I'm open to suggestions.

 

[TonyR]

From IPCT's Wiki, Troubleshooting Streaming Problems

Moving objects leaving trails (ghosting)​

​

Depending on the severity of the effect, it could be caused by dropped frames (see above) or simply by your camera settings. Particularly if the effect only happens in low light, it could be the result of using too strong of WDR or 3D NR (noise reduction) in the camera's web interface.​

​

Although the above is written for Blue Iris (VMS on a PC), it could be applicable to your camera settings. What is the camera's resolution, frame rate, bit rate type, bit rate, etc. ?....a screen shot of the cam's "Video" configuration would help.

 

[AgentShawn]

For sure!

For Main Stream:

Encode: H.264H
Smart Codec: Off
Resolution: 1920*1080(1080P)
FPS: 30
Bit Rate Type: CBR
(5,000 bit rate)
I Frame Interval: 30
SVC" 1(off)

For Sub Stream:

Encode: H.264H
Resolution: 704*480(D1)
FPS: 30
Bit Rate Type: CBR
(1,024 bit rate)
I Frame Interval: 60
SVC" 1(off)

Thank you and let me know if you need anything else.

 

[wittaj]

Screenshots of exposure, brightness, contrast, etc.

 

[AgentShawn]

Screenshots of exposure, brightness, contrast, etc.

Under the Picture settings:
Brightness, Contrast, Saturation, Chroma CNT, Sharpness, Sharpness CNT, and Gamma is set to 50 (out of 100)
Flip is 0 degrees
EIS is off
Picture Freeze is off

Under the Exposure Settings:
Anti-flicker is set to Outdoors
Mode is Auto
Exposure Comp is at 50 out of 100
AE Recovery is 15mins
2D NR is on with grade at 50 of 100
3D NR is on with grade at 50 of 100

Hope that is helpful?

 

[TonyR]

For Main Stream:

Encode: H.264H
Smart Codec: Off
Resolution: 1920*1080(1080P)
FPS: 30
Bit Rate Type: CBR
(5,000 bit rate)
I Frame Interval: 30
SVC" 1(off)

For Sub Stream:

Encode: H.264H
Resolution: 704*480(D1)
FPS: 30
Bit Rate Type: CBR
(1,024 bit rate)
I Frame Interval: 60
SVC" 1(off)

Try these:

• Set all to standard H.264 (if available)
• Set all FPS to 15 and the iFrame interval to 15
• Change bit rate to 4096

BTW, what is the lighting conditions at the time?

 

[AgentShawn]

Try these:

• Set all to standard H.264 (if available)
• Set all FPS to 15 and the iFrame interval to 15
• Change bit rate to 4096

BTW, what is the lighting conditions at the time?

So, the FPS has to be 30 at minimum. That's per the gaming board regulations in my state. If I don't change that setting, should I change the others differently than what you have suggested or do the same?

As for lighting, there is a lot of slot machines in the area. Those of course have many lights static and flashing. Overhead lights are darker typically.

 

[bigredfish]

Exposure at “Auto” is probably your biggest problem. Try Manual 0-4 for daytime, Manual 1/120 for nighttime if you have enough light, if not try 1/60

 

[bigredfish]

You can also drop 3D/2D NR
DNR causes motion blur when too high.

Again all dependent on ambient light. Daytime outdoors typically 30 is fine. Night is harder. 50 max but see if you can dial it back.

it’s a balance between blur and noise. The two main things to experiment with are going to be DNR and Exposure. Next is Gain
Faster exposure helps freeze motion, but also makes the image darker.

A snapshot of your scene would help a lot

 

[TonyR]

So, the FPS has to be 30 at minimum. That's per the gaming board regulations in my state.

Too bad the gaming board's "CCTV experts" are OK with blurred images at night.....unless other suggested changes above resolve the issue.

 

[jrbeddow]

^^^This. So many people have the (totally false) impression that a higher FPS setting (like 30, rather than 15) will add to the overall "clarity", when in fact it only adds to the smoothness of motion, potentially at the expense of actual sharpness in a stopped frame (screenshot, etc..). Oh well, I guess they must know "best", LOL.

 

[wittaj]

I say it often LOL - shutter speed is more important than FPS.

 

[bigredfish]

FPS isn’t gonna fix his ghosting problem at 5FPS or 60 FPS

 

[AgentShawn]

So I adjusted the DNR and it seems to have fixed the camera with issues. I truly appreciate the help.

On the FPS. In this state, we are hung on laws concerning gaming and the state isn't that fast about changing the laws.

I'm just thankful communities like this exists with folks like you. I truly appreciate it.

I'll definitely stick around

 

[TonyR]

So I adjusted the DNR and it seems to have fixed the camera with issues.

So, DNR (Digital Noise Reduction) was the culprit. Pretty close to my suggestion in post #2:

​

......Particularly if the effect only happens in low light, it could be the result of using too strong of WDR or 3D NR (noise reduction) in the camera's web interface. ​

And @bigredfish was spot-on. Glad you were able to get it adjusted to your satisfaction!

 

[TonyR]

On the FPS. In this state, we are hung on laws concerning gaming and the state isn't that fast about changing the laws.

If it makes you feel any better, another member has some hoops to jump through, albeit in California, to satisfy local government rules. On Jan. 1, 2024 all FFL (Federal Firearm License) holders/gun dealers are required, in his words, "...to maintain 24/7 365 days of audio/ video for 5-6 cameras. 15fps, 2-3mp."

365 days of saved video/ audio help

I need to maintain 24/7 365 days of audio/ video for 5-6 cameras. 15fps, 2-3mp. My issue is how to decide saving so much data. The options I’ve thought of are below. I’m asking what you think would be the best choice. Option 1, Raid 1 drive setup for the video. This will give me some...

ipcamtalk.com

The new law:

California Enacts Unique Video and Audio Surveillance Requirements for Firearms Dealers - Security Industry Association

California Enacts Unique Video and Audio Surveillance Requirements for Firearms Dealers

www.securityindustry.org

 

[AgentShawn]

I turned 3D/4D off and it took the ghosting away.

Now I have an issue with the same cameras. Slot machines are showing moving light using the color purple. The light on the way makes it slightly blurry or more so fuzzy.

What could I do to fix that?

 

[bigredfish]

You don’t want DNR completely off. See it to 20 should be fine.

What’s your exposure setting? Should be at least 1/60 not Auto

What’s your bitrate? Should be 8192

 

[AgentShawn]

You don’t want DNR completely off. See it to 20 should be fine.

What’s your exposure setting? Should be at least 1/60 not Auto

What’s your bitrate? Should be 8192

That fixed that!

As for bitrate, I do want to lower that on all my PTZs. I get a lot of pauses on my live monitors and skips and have wondered if I lower my bitrate if that will require less resources on my servers.

 

[bigredfish]

It may, but I thought we were talking about image quality?

If you have to reduce bitrate, FPS, etc to accommodate the resources, to me its defeating the purpose. Image quality for me is #1 otherwise I would buy a dog and let him watch over things. I require my infrastructure/resources to support the image quality

Still not sure I understand your previous post about moving lights and purple???