[Video] Adding a USB Webcam to DWC with a Raspberry Pi

stuartofmt

I've tried a few different packages that present the Pi camera as a web cam. The simplest I have found (and one I currently use) is here:

http://picamera.readthedocs.io/en/latest/recipes2.html#web-streaming

I have used it in the past with DWC but do not normally. I use it daily as a web cam for general monitoring of my printer http://<ip address:port> and as a feed to timelapse software.

Having said that I just tried with DWC. There does seem to be a problem with DWC in the version I have (1.23). It does not "like" the URL. It sometimes even adds irrelevant paths to the url for the camera. For example I put in http://<ip address:port> and it changes it to http://<ip address:port>/Job. So there may be an issue there - or I simply am not doing something right.

EDIT: Solved the issue - entirely my error. Needs to be in an iframe

Phaedrux

@stuartofmt said in [Video] Adding a USB Webcam to DWC with a Raspberry Pi:

DWC in the version I have (1.23)

That's a quite old version of DWC now as well. Things are a bit different in DWC3.x

stuartofmt

@Phaedrux

Sorry - I have DWiFi Server 1.23 and DWC 3.1.1 -- looked but didn't look

fractalengineer

brilliant, thank you. I never knew how to make it work but that step by step guide is of great help.

I seem to be stuck halfway though; I installed snapd and mjpg streamer and everything seems to be running well (see the snapd process)

pi@duet3:~ $ ps -A
  PID TTY          TIME CMD
    1 ?        00:00:06 systemd
    2 ?        00:00:00 kthreadd
    3 ?        00:00:00 rcu_gp
    4 ?        00:00:00 rcu_par_gp
    7 ?        00:00:00 kworker/u8:0-events_unbound
    8 ?        00:00:00 mm_percpu_wq
    9 ?        00:00:00 ksoftirqd/0
   10 ?        00:00:00 rcu_sched
   11 ?        00:00:00 migration/0
   12 ?        00:00:00 cpuhp/0
   13 ?        00:00:00 cpuhp/1
   14 ?        00:00:00 migration/1
   15 ?        00:00:00 ksoftirqd/1
   18 ?        00:00:00 cpuhp/2
   19 ?        00:00:00 migration/2
   20 ?        00:00:00 ksoftirqd/2
   23 ?        00:00:00 cpuhp/3
   24 ?        00:00:00 migration/3
   25 ?        00:00:00 ksoftirqd/3
   28 ?        00:00:00 kdevtmpfs
   29 ?        00:00:00 netns
   30 ?        00:00:00 kworker/0:1-events
   32 ?        00:00:00 kauditd
   33 ?        00:00:00 khungtaskd
   34 ?        00:00:00 oom_reaper
   35 ?        00:00:00 writeback
   36 ?        00:00:00 kcompactd0
   54 ?        00:00:00 kblockd
   55 ?        00:00:00 blkcg_punt_bio
   56 ?        00:00:00 watchdogd
   58 ?        00:00:00 rpciod
   59 ?        00:00:00 kworker/u9:0-hci0
   60 ?        00:00:00 xprtiod
   61 ?        00:00:00 kswapd0
   62 ?        00:00:00 nfsiod
   64 ?        00:00:00 iscsi_eh
   65 ?        00:00:00 dwc_otg
   66 ?        00:00:00 DWC Notificatio
   67 ?        00:00:00 kworker/1:2-events
   68 ?        00:00:00 vchiq-slot/0
   69 ?        00:00:00 vchiq-recy/0
   70 ?        00:00:00 vchiq-sync/0
   71 ?        00:00:00 vchiq-keep/0
   72 ?        00:00:00 SMIO
   73 ?        00:00:00 kworker/1:3-events_freezable
   74 ?        00:00:00 mmc_complete
   75 ?        00:00:00 kworker/1:1H-kblockd
   76 ?        00:00:00 kworker/0:1H-mmc_complete
   77 ?        00:00:00 jbd2/mmcblk0p2-
   78 ?        00:00:00 ext4-rsv-conver
   79 ?        00:00:00 kworker/0:2H-kblockd
   80 ?        00:00:00 ipv6_addrconf
   84 ?        00:00:00 kworker/2:1H-kblockd
   86 ?        00:00:00 kworker/3:1H-kblockd
  101 ?        00:00:00 kworker/1:2H
  102 ?        00:00:00 kworker/3:2H-kblockd
  108 ?        00:00:00 irq/166-usb-001
  111 ?        00:00:00 kworker/2:2H-kblockd
  123 ?        00:00:03 systemd-journal
  144 ?        00:00:01 kworker/u8:2-events_unbound
  148 ?        00:00:01 systemd-udevd
  149 ?        00:00:00 loop0
  150 ?        00:00:00 loop1
  172 ?        00:00:00 SMIO
  179 ?        00:00:00 mmal-vchiq
  180 ?        00:00:01 spi0
  183 ?        00:00:00 mmal-vchiq
  186 ?        00:00:00 mmal-vchiq
  189 ?        00:00:00 mmal-vchiq
  233 ?        00:00:00 cfg80211
  241 ?        00:00:00 brcmf_wq/mmc1:0
  244 ?        00:00:00 brcmf_wdog/mmc1
  321 ?        00:00:00 systemd-timesyn
  358 ?        00:00:00 cron
  359 ?        00:00:00 rsyslogd
  360 ?        00:00:00 dbus-daemon
  362 ?        00:01:25 DuetControlServ
  363 ?        00:00:00 thd
  366 ?        00:00:00 wpa_supplicant
  368 ?        00:00:00 rngd
  373 ?        00:00:00 avahi-daemon
  374 ?        00:00:00 alsactl
  377 ?        00:00:00 systemd-logind
  397 ?        00:00:02 snapd
  425 ?        00:00:00 avahi-daemon
  471 ?        00:00:00 wpa_supplicant
  479 ?        00:00:00 kworker/3:4-events_power_efficient
  534 ?        00:00:02 irq/167-dcs-trp
  549 ?        00:00:00 kworker/2:2-events
  553 ?        00:00:00 hciattach
  555 ?        00:00:00 kworker/u9:1-hci0
  557 ?        00:00:00 bluetoothd
  558 ?        00:00:00 bluealsa
  573 ?        00:00:00 krfcommd
  628 ?        00:00:00 dhcpcd
  633 ?        00:00:21 DuetWebServer
  645 tty1     00:00:00 agetty
  654 ?        00:00:00 sshd
  666 ?        00:00:00 sshd
  795 ?        00:00:00 systemd
  796 ?        00:00:00 (sd-pam)
  810 ?        00:00:00 sshd
  811 pts/0    00:00:00 bash
  834 pts/0    00:00:00 sudo
  835 pts/0    00:00:00 nano
  984 ?        00:00:00 kworker/0:0-events
  985 ?        00:00:00 kworker/3:1-cgroup_destroy
  988 ?        00:00:00 kworker/2:0-mm_percpu_wq
  994 ?        00:00:00 kworker/0:0H
  995 ?        00:00:00 kworker/3:0H
  996 ?        00:00:00 kworker/1:0-events
 1005 ?        00:00:00 kworker/u8:1-events_unbound
 1053 ?        00:00:00 kworker/3:0-events_power_efficient
 1154 ?        00:00:00 kworker/0:2-events
 1157 ?        00:00:00 kworker/2:1-events
 1159 pts/0    00:00:00 ps

mjpg is well installed

pi@duet3:~ $ sudo snap install mjpg-streamer
snap "mjpg-streamer" is already installed, see 'snap help refresh'

And I've copied exactly the same config file as yours

pi@duet3:~ $ sudo nano /var/snap/mjpg-streamer/current/config
  GNU nano 3.2                                                                                       /var/snap/mjpg-streamer/current/config

INPUTOPTS="input_uvc.so -y -r 640x480 -d /dev/video0"
PORT="-p 8080"
DAEMON="true"

And yet when I enter my duet IP :8080, I get no response.

Any hint on what could be the issue?

Using a RPi 3B+ on Duet3

Thanks!

PCR

Which USB Camera are you using?

fractalengineer

@PCR well I'm not; I got a raspi cam.

My first attempt was with the line INPUTOPTS="input_raspi.so" as described in the guide but that didn't work out either.

I thought I would try with your config that seemed to be working as it seems the issue is with the interface not loading; I would assume if the camera was setup wrong the GUI would still load, just show no image.

PCR

Sorry. Raspi Cam is Not working with the SNAP. Interface will only be loade when camera is working.

I saw on github a new plugin for raspi cams for DWC

Best

PCR

@fractalengineer

use this

https://desertbot.io/blog/how-to-stream-the-picamera

fractalengineer

@PCR Thanks, I did manage to get it working just for a few moments before it froze and I can't get it to run again lol (the interface load, not the cam)

But I'll keep trying and keep you posted

gdefranc

Installed on rasp pi3 with octoprint and activated on DWC with Logitech C270 webcam. It works.
Now I have to fix the Timelapse.

PCR

@gdefranc with duetlapse easy. But use the snapshot Screen of Mjpg

PCR

And the DuetAPI from @jay_s_uk

fma

You can turn a Pi zero+ cam as a usb webcam, using https://github.com/showmewebcam/showmewebcam

Phaedrux

I use a PizeroW with the Pi cam module and MotionOS to turn it into a webcam. It works very well with DWC and makes for a very small and very functional cam.

https://github.com/ccrisan/motioneyeos/wiki