low latency rpi csi camera stream using opencv, flask, libcamera-vid
- You can open multiple browsers at the same time
- The speed of the video is very fast, almost real time
- The stream uses UDP
$ sudo apt update --fix-missing
$ sudo apt install -y libopenjp2-7-dev libhdf5-dev libatlas-base-dev python3-pip python3-h5py python3-opencv libqt5gui5 libqt5webkit5 libqt5test5
$ sudo pip3 install flask- Check the app.py for the python script
- The libcamera-vid command to stream from the camera as UDP is, for fast response, do not increase the resolution, i used Module 3
libcamera-vid -t 0 --level 4.2 --denoise cdn_off --codec mjpeg --inline -o udp://127.0.0.1:5800 -n --segment 1 -q 80 --width 854 --height 480
sudo nano /lib/systemd/system/pi-vid.service
Contents
[Unit]
Description=The Pi camera stream in UDP
After=network.target
[Service]
User=pi
Type=simple
ExecStart=/usr/bin/libcamera-vid -t 0 --level 4.2 --denoise cdn_off --codec mjpeg --inline -o udp://127.0.0.1:5800 -n --segment 1 -q 80 --width 854 --height 480
Restart=always
[Install]
WantedBy=multi-user.targetTo start the service and enable it to start at boot
$ sudo systemctl start pi-vid
$ sudo systemctl enable pi-vid
sudo nano /lib/systemd/system/pi-vid-stream.service
Contents, the WorkingDirectory has to be set inside the folder with app.py
[Unit]
Description=The Pi camera stream in HTTP
Requires=pi-vid.service
After=pi-vid.service
[Service]
User=pi
Type=simple
WorkingDirectory=/home/pi/raspbian-csi-stream
ExecStart=/usr/bin/python3 ./app.py
Restart=always
[Install]
WantedBy=multi-user.targetTo start the service and enable it to start at boot
$ sudo systemctl start pi-vid-stream
$ sudo systemctl enable pi-vid-stream
192.168.x.x has to be the ip of the rpi
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<img
id="bg"
src="http://192.168.x.x:5700/video_feed"
style="width: 88%"
/>
</body>
</html>