Real-Time Multi-Stream Video Analytics with GPU-Accelerated AI
An enterprise security provider needed to process multiple live video streams simultaneously with AI-powered detection, delivering real-time alerts with precise timestamp synchronization across distributed infrastructure.
Discuss Your Project
The Challenge
Processing multiple RTSP streams with AI required solving several complex problems:
- GPU memory constraints limited concurrent stream processing
- Clock skew between recording machines and inference machines caused timestamp drift
- Traditional detection models were too slow for real-time multi-stream scenarios
- Events needed to map precisely to video playback positions for review
Our Solution
We engineered a distributed AI inference platform optimized for multi-stream real-time processing with PTS-based timestamp synchronization.
Architecture
- Inference Engine: YOLO11 with TensorRT acceleration on NVIDIA RTX 4000 Ada
- Tracking: ByteTrack multi-object tracking with persistent ID assignment
- Streaming: MediaMTX for RTSP/HLS/RTMP protocol conversion
- Communication: Dual WebSocket channels (live detections overlay + event alerts)
- Infrastructure: DigitalOcean (recording) + RunPod (GPU inference)
Optimization Techniques
- TensorRT Acceleration - Model compilation to TensorRT for ~15ms batch inference
- Micro-Batching - Frames from multiple streams batched for GPU efficiency
- Memory Management - 4-6GB VRAM usage for 10-12 concurrent streams
- PTS Timestamp Sync - Presentation Timestamp-based synchronization fixing cross-machine clock skew
- Cross-Machine Offset Correction - Automatic time offset calculation between distributed nodes
Detection Pipeline
- Person/vehicle detection with confidence scoring
- License plate recognition and text extraction via EasyOCR
- Fire and smoke detection with configurable sensitivity
- Behavioral analytics (loitering duration, intrusion zones, occupancy thresholds)
Key Features
- Dual WebSocket Channels - Separate streams for video overlay data and alert events
- PTS Synchronization - Event timestamps match exact video playback positions
- Persistent Object Tracking - ByteTrack maintains IDs across frames for consistent tracking
- Configurable Detection Zones - Define intrusion/loitering regions per camera
- Auto-Scaling - Dynamic stream allocation based on GPU availability
Results
Technology Stack
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