環境：Raspberry Pi OS / mjpg-streamer

・HQ Camera の確認
　vcgencmd get_camera
>> supported=1 detected=1
　sudo raspistill -f -t 60000

・mjpg-streamer の準備
　cd /opt
　sudo mkdir mjpg-streamer
　cd mjpg-streamer
>> sudo apt update
　sudo apt-get install cmake libjpeg8-dev
　sudo git clone https://github.com/jacksonliam/mjpg-streamer.git
　cd mjpg-streamer/mjpg-streamer-experimental
　sudo make
　sudo make install

　cd /opt/mjpg-streamer/mjpg-streamer/mjpg-streamer-experimental
　bash start.sh

・systemd の設定
　sudo nano mjpg-streamer.service
>> [Unit]
>> Description=mjpg-streamer
>> After=syslog.target
>>
>> [Service]
>> Type=simple
>> WorkingDirectory=/opt/mjpg-streamer/mjpg-streamer/mjpg-streamer-experimental
>> ExecStart=/opt/mjpg-streamer/mjpg-streamer/mjpg-streamer-experimental/start.sh
>> TimeoutStopSec=5
>> StandardOutput=null
>>
>> [Install]
>> WantedBy=multi-user.target
　sudo cp mjpg-streamer.service /etc/systemd/system/

　sudo systemctl enable mjpg-streamer
　sudo systemctl disable mjpg-streamer
　sudo systemctl start mjpg-streamer
　sudo systemctl stop mjpg-streamer

・GPIO power-sw
　sudo nano /boot/config.txt
>> [all]
　dtoverlay=gpio-shutdown,debounce=3000

・Raspberry Pi Documentation
　https://www.raspberrypi.org/documentation/computers/os.html