AI video analytics use case
No-motion and black-screen alerts for CCTV cameras
Short answer
A no-motion or black-screen alert flags a camera whose video has gone black, frozen, or shown no expected activity for an unusually long time. It catches failed feeds, stuck streams and silent sensors that still appear online, so blind spots are fixed before footage is needed rather than discovered during an investigation.
How no-motion or black-screen alerts work
Image checks look for frames that are almost entirely dark or uniform, frames that stop changing because the stream has frozen, and streams that stop arriving altogether. For cameras where activity is expected, a prolonged lack of any visual change can also indicate a problem.
These checks complement network monitoring: a camera can answer a ping while delivering a black, frozen or empty image.
In OrionAlerts
In OrionAlerts this belongs to health monitoring. The health engine inside Nebula OS continuously checks device, stream and recording status per camera, so it can catch a camera that pings but has stopped recording, and it flags conditions such as a black screen, stream interruption or prolonged lack of expected visual activity. Alerts reach the dashboard, mobile app and email.
What affects reliability
Detection quality depends on the scene as much as the model. These are the factors to check during site survey and pilot.
- Expected activity: some cameras legitimately see no motion for long periods, so no-motion rules should be scheduled for views where activity is normal.
- Lighting: scenes that are genuinely dark at night can look like a black screen unless the camera has infrared or the rule is scheduled.
- Network quality: intermittent links can cause stream interruptions that need to be distinguished from camera faults.
- Recording status: checking that footage is actually being written matters as much as checking the live image.
What you need
No camera replacement is assumed. A typical OrionAlerts deployment needs:
- Existing IP cameras and recorders connected over ONVIF, RTSP or a supported vendor SDK. Compatibility is confirmed per camera model during solution design.
- An on-site Nebula OS node, whose health engine checks device, stream and recording status for every connected camera.
- No-motion rules scheduled only for camera views where activity is normally expected.
- Optional: Orion Cloud for a central view of camera health and alerts across multiple sites, without uploading raw video.
- Health checks run on the Nebula OS node itself. GPU acceleration is used where AI analytics are enabled; image, stream and recording checks need no extra camera hardware.
Where it is used
This use case commonly applies in the industries below. Each industry page covers the risks, detections and modules that matter for that kind of site.
Solution
Which solution it belongs to
No-Motion or Black-Screen Alert is part of Health Monitoring: spot camera, NVR, storage, and network issues before they create operational blind spots.
Explore Health MonitoringFAQ
No-Motion or Black-Screen Alert: common questions
Why can a camera look online but still be a blind spot?
Because a network ping only proves the device responds. A camera can answer a ping while its image is black, frozen or blocked, or while the recorder has stopped saving footage. Image, stream and recording checks catch what a ping misses, so the blind spot is found before footage is needed.
Which OrionAlerts module handles black-screen alerts?
Health monitoring. Its health engine runs inside Nebula OS and tracks device, stream and recording status for every connected camera. It flags black screens, stream interruptions and recording failures, and sends alerts to the dashboard, mobile app and email so the responsible team can fix the camera.
Can a failed feed raise a maintenance request?
Yes. Health monitoring and asset records share one device record in Nebula OS, so a failing camera can raise a service request against the vendor and the AMC or warranty attached to that device. The request is then tracked in AMC management, from intake and vendor dispatch through to closure.
Related use cases
Plan this use case for your sites
We will review your camera views for this use case, scope the deployment for your sites and show it in a live demo.