OctoPi multi web cam

root@octopi:/home/pi# lsusb
Bus 001 Device 005: ID 2c99:0002
Bus 001 Device 004: ID 2c99:0002
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@octopi:/home/pi# lsusb
Bus 001 Device 005: ID 2c99:0002
Bus 001 Device 006: ID 0ac8:3500 Z-Star Microelectronics Corp.
Bus 001 Device 004: ID 2c99:0002
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

• check what process is running your first camera and where it sends output

t@octopi:/home/pi# ps -ef | grep mjpg
 pi         657   578  0 04:43 ?        00:01:54 ./mjpg_streamer -o output_http.so -w ./www-octopi -n -i input_uvc.so -r 640x480 -f 10

• start new process under

root@octopi: cd /home/pi/mjpg-streamer
root@octopi:/home/pi/mjpg-streamer LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./;./mjpg_streamer -i "input_uvc.so -d /dev/video1 -y 630x480 " -o "output_http.so -w ./www-octopi -p 8801" 

• Check that new process is created

 root@octopi:/home/pi# ps -ef | grep mjpg
 pi         657   578  0 04:43 ?        00:01:54 ./mjpg_streamer -o output_http.so -w ./www-octopi -n -i input_uvc.so -r 640x480 -f 10
 pi        4559  4208 68 19:11 pts/0    00:00:07 ./mjpg_streamer -i input_uvc.so -d /dev/video1 -y 630x480  -o output_http.so -w ./www-octopi -p 8801
 root      4565  4500  0 19:11 pts/1    00:00:00 grep mjpg 

• Check that web stream 1 is running

http://192.168.0.213/?action=stream

• Check that second stream is running

http://192.168.0.213:8801/?action=stream

• Edit your crontab and add following line

crontab -e 
@reboot /home/pi/mjpg-streamer/mjpg_streamer -i "input_uvc.so -d /dev/video1 -y 630x480 " -o "output_http.so -w ./www-octopi -p 8801"

• Setup your haproxy configuration

frontend public
         bind *:80
         bind 0.0.0.0:443 ssl crt /etc/ssl/snakeoil.pem
         option forwardfor except 127.0.0.1
         use_backend webcam if { path_beg /webcam/ }
         use_backend webcam2 if { path_beg /webcam2/ }
         use_backend octoprint if { path_beg /octoprint/ }
         use_backend octoprint2 if { path_beg /octoprint2/ }
         default_backend webcam

backend webcam2
         reqrep ^([^\ :])\ /webcam2/(.)     \1\ /\2
         server webcam2  127.0.0.1:8801
         errorfile 503 /etc/haproxy/errors/503-no-webcam.http

• restart HA proxy

root@octopi:/home/pi#  sudo /etc/init.d/haproxy restart
 [ ok ] Restarting haproxy (via systemctl): haproxy.service.

• disable default webcamd

root@octopi:/home/pi# more /etc/default/webcamd
# Configuration for /etc/init.d/webcamd
# Daemon
DAEMON=/root/bin/webcamd
# Log file to use
LOG=/var/log/webcamd.log
# User to run under
USER=pi
# Should we run at startup?
ENABLED=0

Original article:

I had a positive experience with RPi camera (Noir or normal) together with one small USB camera. It was quite (resources) expensive, but RPi3 was ok with that.

I have used https://github.com/jacksonliam/mjpg-streamer

In the directory mpjg-streamer was installed:

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./;./mjpg_streamer -i "input_uvc.so -d /dev/video0 -y 630x480 " -o "output_http.so -w ./www -p 8080

and for the raspberry I used this:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./;./mjpg_streamer -i "input_raspicam.so -hf -vf -x 1024 -y 768 -mm matrix -fps 3 " -o "output_http.so -w ./www -p 8088"

These commands I run using two times screen (like screen -S rpi and screen -S usb) to be able to log out and leave them running. You can play with options the options for both camera (-y on usb enables most of cams with yuv mode, -d is sometimes needed.).

I have even a complicated script with a loop that starts cams, but I doubt it is mature enough to be widely used. You have the output as http on ports 8080 and 8088.

Source: https://community.octoprint.org/t/how-can-i-configure-dual-cameras-1-pi-camera-and-1-usb-camera-on-a-dual-printer-setup/694/14