[WIP] Multiple Webcam streams in Control (Multicam)

Have you also added something in your frontend to tell haproxy to use the alternative webcam backend when encountering the webcam-alt prefix? The config snippet you shared only shows that you configured a backend, but not that you also added a rule to the frontend.

Nope, I hadn't done that yet. I've never worked with haproxy before, just apache and nginx for reverse-proxy stuff. I'll go look at the config file again. Thanks for the tip!

edit: tadaaaaa, that did it. Config for anyone else who might need it:

frontend public
        bind :::80 v4v6
        bind :::443 v4v6 ssl crt /etc/ssl/snakeoil.pem
        option forwardfor except
        use_backend webcam if { path_beg /webcam/ }
        use_backend webcam2 if { path_beg /webcam2/ }
        default_backend octoprint

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

Also if anyone else is interested in using mjpg_streamer for both cameras:

export LD_LIBRARY_PATH="$(pwd)"
./mjpg_streamer -i "./input_uvc.so -d /dev/video0 -r 1920x1080" -o "./output_http.so -p 8080 -w ./www/" & ./mjpg_streamer -i "./input_uvc.so -d /dev/video1 -r 640x480" -o "./output_http.so -p 8081 -w ./www/"

I haven't yet figured out how to use the octopi.txt config to allow multiple instances to run, so for now I'm using a cron to kill the original mjpg_streamer instance and run this script


Found a more acceptable way to configure the second stream: https://printoid.net/2017/04/29/trick-12-support-two-cameras-in-printoid-premium/

looks like in the current iteration of Octopi, the above linked method is depreciated. Instead it's invoked from webcamd: https://github.com/guysoft/OctoPi/blob/91380e2a12b96f5bcbf9314fcaf1f0c04b830f49/src/modules/octopi/filesystem/home/root/bin/webcamd

Hi All,

Based on Alan_Weinstocks Edit1, I hacked the /root/bin/webcamd to play with the dual instance of mjpg-streamer. That way OctoPi starts up as normal but both webcams are working. Just a sloppy hack for now to see if it'd work and if it'll affect my print work stability. In my case I know my cams are without issues and that they were at /dev/video0 and /dev/video1.

Seems to work at least for playing around. Printing a few tests to see if anything happens weird.

My edits for those interested:

pi@octopi:/root/bin $ diff webcamd xxx_webcamd.orig 
< #        echo Running ./mjpg_streamer -o "output_http.so -w $camera_http_webroot $camera_http_options" -i "$input"
< #        LD_LIBRARY_PATH=. ./mjpg_streamer -o "output_http.so -w $camera_http_webroot $camera_http_options" -i "$input" &
<         LD_LIBRARY_PATH=. 
<         echo Running ./mjpg_streamer -i "./input_uvc.so -d /dev/video0 -r 1920x1080" -o "./output_http.so -p 8080 -w $camera_http_webroot" &
<         ./mjpg_streamer -i "./input_uvc.so -d /dev/video0 -r 1920x1080" -o "./output_http.so -p 8080 -w $camera_http_webroot" &
<         echo Running ./mjpg_streamer -i "./input_uvc.so -d /dev/video1 -r 1920x1080" -o "./output_http.so -p 8081 -w $camera_http_webroot" &
<         ./mjpg_streamer -i "./input_uvc.so -d /dev/video1 -r 1920x1080" -o "./output_http.so -p 8081 -w $camera_http_webroot" &
>         echo Running ./mjpg_streamer -o "output_http.so -w $camera_http_webroot $camera_http_options" -i "$input"
>         LD_LIBRARY_PATH=. ./mjpg_streamer -o "output_http.so -w $camera_http_webroot $camera_http_options" -i "$input" &

I configure the multicam plugin to find the streams as follows:




I'll send a pull request to OctoPi/src/modules/octopi/filesystem/home/root/bin/webcamd with a real "fix"/Feature-add in a bit, I need some time to think about it.

Thanks Guys!

don't mind my noobness, but as I understand it.

basically for a 2nd camera to work I will need to assign it to a "video1" with the hardware number xxxx:xxxx? im guessing in the dev/video1 folder?

then assign it in mjpg streamer.?

I feel im understanding the process, but not sure.

DĂ©butant dans le domaine, je serais intĂ©ressĂ© de pouvoir obtenir le mĂȘme rĂ©sultat (deux webcam, avec deux boutons comme sur votre exemple)
(ou deux écrans simultanés, cÎte à cÎte)
J'essaie d'utiliser le plugins ( multicam) et Ă  l'action sur le bouton, l'Ă©cran de la webcam affiche
"" peut ne pas ĂȘtre configurĂ© correctement ou nĂ©cessiter une authentification. Vous pouvez modifier l'URL du flux sous "ParamĂštres"> "Webcam & AccĂ©lĂ©rĂ©"> "Webcam"> "URL du flux". Si vous n'avez pas de webcam, vous pouvez Ă©galement dĂ©sactiver la prise en charge de la webcam.""

de m'Ă©clairer

I recently ran the update on multicam that popped up on my browser in Octopi. It never ran correctly so figured I would try it out. After the update, and reboot Octopi browser takes FOREVER to load on a Pi 3b. WinSCP times out..