Dahua DHI-TPC-SD2241-T PTZ Delay and Overshooting Issue

[Sam Alley-Stump]

Hello,

I have a Dahua DHI-TPC-SD2241-T thermal PTZ camera with the following firmware:

• System Version: 2.650.0000000.18.R
• Build Date: 2023-08-14
• PTZ Version: 2.401.0000000.1.RHNZ_191031

The camera is linked via a Wi-Fi point-to-point connection to the recorder. The link distance is 100 meters with an excellent connection quality (144 Mbps link speed).

The recorder in use is Dahua 5432 with the latest firmware:
• System Version: 4.002.0000000.0
• Release Date: 11-08-2021

Issue Description:

The PTZ control has a noticeable delay, and the camera often continues moving beyond the intended position. Even a small movement command can cause the camera to overshoot up to 90 degrees or even to the extreme position. In some cases, it even rotates a full 360 degrees after a minimal control input.

I have tested various encoding settings (see attached image of current setup, i also have used 25fps& general coding& CBR 2000) and different network configurations, but the issue persists.

Has anyone experienced similar behavior with this camera model? Could this be related to firmware, network latency, PTZ control settings, or a mechanical issue? Any advice or troubleshooting steps would be greatly appreciated.

 

[wittaj]

Most here use H264.

By wifi point-to-point, be more specific - like a wifi router or something like ubiquity nanostation? Please supply make/model of your devices for this connection.

One issue with PTZs seem to be that lag and delay when being done by wifi.

 

[Sam Alley-Stump]

Yes, here is details of wlan device. And yes, lag might be one thing affecting but there is no possibility to run cables so i hope to find out anything to be done with setup/encode or something.

 

[Sam Alley-Stump]

Hi all again,

Following up on the previous post, I’ve made some changes to rule out possible causes of the PTZ control lag.

First, I replaced a few of the original switches with higher-performance models that have faster switching capacity and larger memory buffers. These should be able to handle video traffic and prevent packet loss or delays even under heavier loads. However, after the upgrade, there was no noticeable improvement in PTZ responsiveness, which suggests the switches were not the bottleneck.

Next, I reached out to the WLAN equipment manufacturer’s technical support team. They performed a remote analysis of the wireless link and reported that the connection is stable with no overlapping channels or interference. The signal quality is excellent, and the bandwidth usage is minimal, so the wireless connection shouldn’t be contributing to the lag either.

At this point, both the network infrastructure and the wireless bridge seem to be functioning as expected, and I’m still experiencing delays when controlling the PTZ cameras remotely.

Does anyone have any ideas or suggestions on what else I should check or try next?

-> maybe i should stip deploying ptz cameras behind of wlan ptp links..?