🛠 Automate an intelligent video stream on AIWorld P1
Objectifs
This tutorial aims to create an autonomous video acquisition system on the AIWorld P1 board. You will learn to configure a Gstreamer pipeline to capture the OV5640 camera stream, process it via OpenCV for basic detection, and save results locally. The goal is to leverage OpenMP parallel computing and OpenMax hardware decoding to ensure smooth 720P 30fps performance without overloading the CPU.
Matériel nécessaire
- AIWorld P1 board connected to a BPI-M2 Ultra or Berry.
- Stable power supply and network connection (WiFi or Ethernet).
- Vecoo Linux system installed and accessible via adb or SSH.
- VecooAT tool for file transfer.
- USB cable or network for debugging.
Étapes
Connect to the board via adb. Ensure ARM Computer Library 17.06 and OpenCV v3.2 are accessible. ``bash adb shell export LD_LIBRARY_PATH=/usr/lib:$LD_LIBRARY_PATH ``
- Environment Preparation
Create a script to initialize capture. Gstreamer V1.10 handles RTSP/HTTP streams. Use the v4l2src plugin for the camera. ``bash gst-launch-1.0 v4l2src device=/dev/video0 ! \n video/x-raw,width=1280,height=720,framerate=30/1 ! \n openmaxjpegdec ! \n videoconvert ! \n autovideosink ` Note that openmaxjpegdec` uses hardware decoding to optimize performance.
- Gstreamer Pipeline Configuration
For processing, compile a C++ program using OpenCV. Enable OpenMP V1.0 for parallel image computation. ``cpp #include <opencv2/opencv.hpp> #include <omp.h> // Simplified capture and processing code ` Compile with -fopenmp` flags and links to ARM libraries.
- OpenCV and OpenMP Integration
Configure a shell script that launches capture, processes frames, and saves detected images to /data/captures. ``bash ./video_processor.sh --output /data/captures/ ``
- Storage Automation
Use VecooAT to push the compiled binary to the board. ``bash adb push video_processor /bin/ adb shell chmod +x /bin/video_processor ``
- Deployment and Testing
Vérification
Launch the script. Verify that the stream displays correctly via autovideosink or an HTTP server. Check CPU usage with top; it should remain moderate thanks to OpenMP. Verify that files appear in the destination folder with consistent timestamps.
Pour aller plus loin
Explore QT5.9 integration with eglfs for a real-time graphical interface. You can also configure an RTSP server to broadcast the processed stream to other devices, leveraging Vecoo platform network capabilities.