Install Mjpg-Streamer raspberry pi 2 3 4 - C920 webcam

sudo apt update
sudo apt install snapd
sudo reboot
sudo snap install mjpg-streamer

can be configured via the /var/snap/mjpg-streamer/current/config file.
Set the DAEMON= option in there to "true", then run "snap restart mjpg-streamer" (or reboot the system) to get the mjpg-streamer service up and running.

Please make sure to run "snap connect mjpg-streamer:camera" command 1x to allow the app to access /dev/video*.

Goto http://[RAPSIIP]:port (port you set in /var/snap/mjpg-streamer/current/config)

Options to set in /var/snap/mjpg-streamer/current/config file:

USB webcams (input_uvc.so)

input_uvc.so comes bundled with MJPG Streamer.

    -d <device>: The video device to use, e.g. -d /dev/video0
    -r <resolution>: The resolution, e.g. -r 640x480 for 640x480px
    -f <framerate>: The framerate in frames per second, e.g. -f 10 for 10 fps
    -q <quality>: The quality of the JPG compression to use, e.g. -q 85 for compression down to 85%
    -y: Use this if your camera doesn't support MJPG, pictures will be captured in YUVY