Configuring explicit webcam with two webcams

[AVDOverflow]

Camera models
Logitech C920 and Logitech C310

What is the problem?
When I set camera_usb_options with a -d in the configuration file, the log reports that it is not set ("USB device was not set in options")

For example in my octopi.txt file, I have:

camera_usb_options="-r 640x480 -f 10 -d usb-046d_HD_Pro_Webcam_C920_C364D97F-video-index0"

In the log, it states that:

config file='/boot/octopi.txt':USB device was not set in options, start MJPG-streamer with the first found video device: /dev/video0

When mjpg streamer is run, the log shows -d twice

Running ./mjpg_streamer -o output_http.so -w ./www-octopi -n --listen 127.0.0.1 -i input_uvc.so -r 640x480 -f 10 -d usb-046d_HD_Pro_Webcam_C920_C364D97F-video-index0 -d /dev/video0

What did you already try to solve it?
1.) I am following the multiple camera tutorial:

Setting up multiple webcams in OctoPi the right way

There's a lot of tutorials and youtube videos around about 'How to setup multicam on OctoPi', and in most of these they involve copying the service files and webcamd, editing some paths and ending up duplicating all the code and manually editing it. However, since OctoPi 0.17 support for configuring multiple cameras is available out of the box, which is much simpler to get going and a lot less likely to cause issues. Multicam setup You can setup as many cameras as you like using this method, j…

2.) I ran ls /dev/v4l/by-id/ to get my devices:

usb-046d_081b_B709CD50-video-index0
usb-046d_081b_B709CD50-video-index1
usb-046d_HD_Pro_Webcam_C920_C364D97F-video-index0
usb-046d_HD_Pro_Webcam_C920_C364D97F-video-index1

3.) I modified /boot/octopi.txt and created /boot/octopi.conf.d/webcam2.txt using nano
[I renamed the files from .txt to .log because the website is preventing me from uploading .txt files]
octopi.log (2.9 KB)
webcam2.log (2.9 KB)

4.) The log files show that mjpg_streamer is trying to run two -d commands

Running ./mjpg_streamer -o output_http.so -w ./www-octopi -n -p 8081 -i input_uvc.so -r 640x480 -d usb-046d_081b_B709CD50-video-index0 -d /dev/video1

The -d /dev/video1 is overriding the -d usb-046d_081b_B709CD50-video-index0
My second camera is using /dev/video2.

5.) Running v4l2-ctl --list-devices shows the following:

HD Pro Webcam C920 (usb-3f980000.usb-1.2):
/dev/video0
/dev/video1

UVC Camera (046d:081b) (usb-3f980000.usb-1.4):
/dev/video2
/dev/video3

6.) Currently only the main camera works because it defaults to /dev/video0. The second camera defaults to /dev/video1 which is the wrong /dev. I cannot figure out why octopi is not recognizing my -d commands in my configuration files.

Logs (/var/log/webcamd.log, syslog, dmesg, ... no logs, no support)
webcamd.log (3.8 KB)

Additional information about your setup (OctoPrint version, OctoPi version, ...)
OctoPrint version : 1.7.3
OctoPi version : 0.18.0

Comments
I feel like I am missing something small or simple, but I cannot pinpoint it. Thanks in advance for the help!

[Charlie_Powell]

You have not followed the guide correctly - you need the full path to the device. You've not given it a valid path when you put -d usb-046d_HD_Pro_Webcam_C920_C364D97F-video-index0.

In the guide:

@Charlie_Powell

Set camera="usb" at the top, and the camera_usb_options line to indicate the device:

camera_usb_options="-r 640x480 -f 10 -d /dev/v4l/by-id/<device long id>"

[AVDOverflow]

Thanks for your quick response! I got it working!