Why does my Hikvision ANPR camera show video on a third-party NVR, but no license plates?
Answered by ANPR AI·Sourced
Short answer
Video feeds and ANPR metadata are transmitted using completely different network protocols. While your third-party NVR can receive the standard video feed via ONVIF Profile S or RTSP, Hikvision transmits its license plate text and vehicle metadata using proprietary ISAPI or ISUP payloads that non-Hikvision NVRs cannot decode.
Explanation
When integrating cameras via the standard ONVIF Profile S protocol, only the video stream and basic binary motion triggers are sent across the network. Many installers assume that because they can see the video feed of a vehicle passing, the NVR should also be able to search for the plate. However, advanced metadata, such as vehicle bounding boxes, country formats, and the actual string of text representing a license plate, requires the receiving NVR to explicitly understand the camera's proprietary data structure.
If a Hikvision ANPR camera is connected to a non-Hikvision NVR, the NVR lacks the software drivers to parse the ISAPI XML payload containing the plate data. While the modern ONVIF Profile M standard was developed to solve this metadata fragmentation, both the camera and the NVR must explicitly support Profile M to exchange text and analytics natively. If the third-party NVR only supports Profile S, it will permanently remain a passive video recorder.
Things to check
- Check if your third-party NVR supports native Hikvision ISAPI integrations, rather than relying on generic ONVIF.Confirm if the NVR firmware and the Hikvision camera firmware both support ONVIF Profile M metadata streaming.
- Verify in the camera's web UI under Advanced Network Settings if the "HTTP Listening" or "Alarm Server" feature can be utilized to bypass the NVR.
What to do
To solve this, you must either replace the NVR with a compatible Hikvision DeepinView or AcuSense NVR that natively decodes ISAPI payloads, or you must bypass the NVR entirely for plate data. You can configure the Hikvision camera's "HTTP Listening Server" to push the XML plate data directly to a custom TCP listener, a third-party access control panel, or an external cloud ANPR API, while leaving the basic video streaming routed to the NVR for forensic storage.
ANPR Edge
Skip the dedicated ANPR camera. Read plates from the cameras you already have.
ANPR Edge is plate-recognition software that runs on a PC at your site and works with ordinary IP cameras, so plate reads no longer depend on one vendor's camera, NVR or firmware.
- Works with standard IP cameras over RTSP
- One license per location covers every camera
- Runs on a Windows PC or Mac you own