git clone https://github.com/mpromonet/v4l2rtspserver
cd v4l2rtspserver
cmake .
make
sudo make install

v4l2rtspserver.service

# systemd configuration for v4l2rtspserver
# /etc/systemd/system/v4l2rtspserver.service
 
[Unit]
Description=v4l2rtspserver rtsp streaming server
After=network.target
 
[Service]
#ExecStartPre=/usr/bin/v4l2-ctl --set-ctrl vertical_flip=1
ExecStartPre=/usr/bin/v4l2-ctl --set-ctrl h264_i_frame_period=5
ExecStart=/usr/local/bin/v4l2rtspserver -F 5 -W 640 -H 480
#ExecReload=/bin/kill -HUP $MAINPID
Type=simple
User=root
Group=video
Restart=always
 
[Install]
WantedBy=multi-user.target

systemctl start v4l2rtspserver

Create a new monitor in ZoneMinder with the following parameters

• Source Type: Remote
• Remote Protocol: RTSP
• Remote Method: RTP/Unicast
• Remote Host Name: Hostname or IP
• Remote Host Port: 8554
• Remote Host Path: /unicast
• Capture Width: 640
• Capture Height: 480

You should soon see the output in zoneminder.

For production, change the resolution of both the camera and the ZoneMinder configuration

1. Edit /etc/systemd/system/v4l2rtspserver.service
   1. Change -W and -H (width and height) to your desired parameters
      1. 1920 x 1080 (1080p) Gives you a lot of details, but also transfers a lot of traffic and is fuzzy
      2. 1280 x 720 (720p) Is a lot lower bandwidth and “prettier” picture

      3. # reload the systemctl daemon
         systemctl daemon-reload
         # reload the config for v4l2rtspserver
         systemctl restart v4l2rtspserver
         # Set v4l2rtspserver to autostart
         systemctl enable v4l2rtspserver

2. Edit Monitor on ZoneMinder
   1. Set Capture Resolution to same values as camera

• https://zoneminder.blogspot.com/p/rasbpeery-pi-zero-camera.html
• https://carlos-journal.blogspot.com/2017/05/setting-up-rtsp-server-in-raspberry-pi.html
• https://unix.stackexchange.com/questions/322720/why-wont-my-enabled-systemd-service-start-on-boot