Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    MotionWebcamServer plugin - Missing library

    Scheduled Pinned Locked Moved
    Beta Firmware
    4
    29
    1.8k
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • adammhaileundefined
      adammhaile
      last edited by

      @Phaedrux any ideas?

      chrishammundefined 1 Reply Last reply Reply Quote 0
      • chrishammundefined
        chrishamm administrators @adammhaile
        last edited by

        @adammhaile It looks like that library is part of libraspberrypi-dev. Can you install it and check if you can start the plugin then (sudo apt install libraspberrypi-dev)?

        Duet software engineer

        adammhaileundefined 2 Replies Last reply Reply Quote 0
        • adammhaileundefined
          adammhaile @chrishamm
          last edited by

          @chrishamm apt says latest is already installed

          pi@rancor:~ $ sudo apt install libraspberrypi-dev
          Reading package lists... Done
          Building dependency tree
          Reading state information... Done
          libraspberrypi-dev is already the newest version (1:1.20211201~buster-1).
          
          adammhaileundefined 1 Reply Last reply Reply Quote 0
          • adammhaileundefined
            adammhaile @adammhaile
            last edited by

            @chrishamm
            So I found where that library lives:

            pi@rancor:~ $ ldconfig -p | grep libvchiq_arm
                    libvchiq_arm.so (libc6,hard-float) => /opt/vc/lib/libvchiq_arm.so
            

            And I attempted to add that directory to my LD path for the dsf user:

            dsf@rancor:~ $ echo $LD_LIBRARY_PATH
            :/opt/vc/lib/
            

            But the plugin still fails with the same error - so seems to not care about LD_LIBRARY_PATH. Is there another way I can set the path for where to find libvchiq_arm for the plugin?

            1 Reply Last reply Reply Quote 0
            • adammhaileundefined
              adammhaile @chrishamm
              last edited by

              @chrishamm Is the actual source code for this plugin somwhere?
              All I can find is the binaries on Github: https://github.com/Duet3D/DSF-Plugins/tree/dev/MotionWebcamServer/dsf/arm

              Would love to dig into it more but hard to without the source.

              chrishammundefined 1 Reply Last reply Reply Quote 0
              • chrishammundefined
                chrishamm administrators @adammhaile
                last edited by

                @adammhaile Do you mean this? https://github.com/Motion-Project/motion It's linked in the MotionWebcamServer README file.

                Duet software engineer

                adammhaileundefined 1 Reply Last reply Reply Quote 0
                • adammhaileundefined
                  adammhaile @chrishamm
                  last edited by

                  @chrishamm Ah - sorry. I missed that it was really just as simple as you running a pre-existing thing.
                  I'll look into it more from there - thanks!

                  1 Reply Last reply Reply Quote 1
                  • luckyflyerundefined
                    luckyflyer
                    last edited by luckyflyer

                    @adammhaile @chrishamm Any follow up on this? I've installed the plugin on 3.4 final with the same results that you had.

                    1 Reply Last reply Reply Quote 0
                    • adammhaileundefined
                      adammhaile
                      last edited by

                      @luckyflyer Unfortunately, no - I have not been able to solve the problem.
                      But glad it's not just me at least?
                      Granted, I've also downloaded motion separately and was unable to get it to work... so it seems to be something wrong with the plugin per-se.
                      I wonder if the DuetPi base image was updated recently and made incompatible with motion

                      chrishammundefined 1 Reply Last reply Reply Quote -1
                      • chrishammundefined
                        chrishamm administrators @adammhaile
                        last edited by

                        @adammhaile @luckyflyer Very odd, it looks like something changed because this definitely worked for me before on another image. The problem is indeed that motion cannot open /opt/vc/lib/libvchiq_arm.so. To fix this, you can edit /etc/apparmor.d/dsf.MotionWebcamServer and insert a new line below /usr/local/lib...:

                          /opt/vc/lib/** rm,
                        

                        Then reboot the Pi or run sudo apparmor_parser -r /etc/apparmor.d/dsf.MotionWebcamServer and you should be able to start the plugin from DWC.

                        Duet software engineer

                        1 Reply Last reply Reply Quote 1
                        • luckyflyerundefined
                          luckyflyer
                          last edited by

                          @chrishamm I ssh into my pi and copy/paste

                          /etc/apparmor.d/dsf.MotionWebcamServer
                          

                          I get a permission denied message.

                          adammhaileundefined 1 Reply Last reply Reply Quote 0
                          • adammhaileundefined
                            adammhaile @luckyflyer
                            last edited by

                            @luckyflyer you'll need to use sudo to edit the file.
                            sudo nano /etc/apparmor.d/dsf.MotionWebcamServer

                            Ctrl+O to save, Ctrl+X to exit once saved

                            1 Reply Last reply Reply Quote 0
                            • luckyflyerundefined
                              luckyflyer
                              last edited by

                              @adammhaile Thanks, I tried sudo but without nano but of course that didn't work either.

                              adammhaileundefined 1 Reply Last reply Reply Quote 0
                              • adammhaileundefined
                                adammhaile @luckyflyer
                                last edited by

                                @luckyflyer why are you trying it without nano?

                                As @chrishamm said:

                                @chrishamm said in MotionWebcamServer plugin - Missing library:

                                To fix this, you can edit /etc/apparmor.d/dsf.MotionWebcamServer and insert a new line below

                                This means you need to edit the file which is what nano does... you can't just "run" that file.

                                1 Reply Last reply Reply Quote 0
                                • luckyflyerundefined
                                  luckyflyer
                                  last edited by luckyflyer

                                  I have the plugin running and have a grey screen that has a message in the top left corner "unable to open video device". I tried a different (known to work camera) with the same results. I ran lsusb and the ports see the camera. I'm using http://192.168.0.181:8081/0/stream Any ideas? Thanks
                                  printer2.jpg

                                  1 Reply Last reply Reply Quote 0
                                  • luckyflyerundefined
                                    luckyflyer
                                    last edited by

                                    Any ideas why the grey screen?

                                    chrishammundefined 1 Reply Last reply Reply Quote 0
                                    • chrishammundefined
                                      chrishamm administrators @luckyflyer
                                      last edited by chrishamm

                                      @luckyflyer Your error message says "Unable to open video device" so your webcam is probably not recognized by the Pi or you don't have access to it. Can you check if /dev/video0 exists? That's the default in the motion settings (see motion.conf in the System Files directory).

                                      Please run sudo gpasswd -a dsf video and reboot your Pi. That should fix it.

                                      Duet software engineer

                                      MintyTreborundefined 1 Reply Last reply Reply Quote 0
                                      • MintyTreborundefined
                                        MintyTrebor @chrishamm
                                        last edited by MintyTrebor

                                        @chrishamm I have just enabled this plugin on a brand new clean duet image install on a pi4 with v3.4. The permissions issues described above were present on the included version of the plugin, and the fix previously posted did indeed work to enable the plugin to start.

                                        However the permissions issues seem to be deeper within the operations of the plugin.
                                        By default the plugin cannot access /dev/video*, neither can it create a log entry in the default logging folder set in the config file (when enabled). I changed the log folder to the tmp directory and I was able to see in the logs that motion was complaining it cannot access the video* device, which results in the grey screen shown in @luckyflyer post.

                                        To prove this is a permissions problem I changed the permissions of /dev/video0 in the terminal (chmod), and the plugin was able to start with video working correctly. I looked at

                                        /etc/apparmor.d/dsf.MotionWebcamServer
                                        

                                        and I can see there is an entry to set the access permissions to /dev/video* in the file, but this does not seem to be working as expected.

                                        --edit - I see you have updated your post since I started this one. I will try the proposed additional command....

                                        -- Update 2 - Additional command worked. Also I found adding the following line to the Live Stream Configuration Parameters section in motion.conf, improved the output framerate significantly :

                                        stream_maxrate 50
                                        

                                        NodeDSF - Native Node-Red integration with Duet boards.
                                        BtnCmd - Customise DWC with user defined buttons/layouts/panels (DWC Plugin)
                                        ReleaseMgr - Duet update info inside DWC.
                                        Repo

                                        MintyTreborundefined 1 Reply Last reply Reply Quote 1
                                        • MintyTreborundefined
                                          MintyTrebor @MintyTrebor
                                          last edited by

                                          If anyone is interested you can show the motion "control" web page inside DWC to allow you access / change some advanced video values (brightness, size etc) in a simple gui provided by motion:

                                          2c770e17-672d-4426-9d64-554dd5ecfbd6-image.png

                                          (you will need BtnCmd Plugin to do this)

                                          Set your motion config like below:
                                          a4769e3f-e9e6-4bae-85ce-5a11f4498ff0-image.png
                                          & restart the plugin

                                          In BtnCmd add a remote source panel:
                                          33d9b149-ef11-43b2-bd89-7f0cf6e18e52-image.png

                                          And set the URL to http://[pi ip]:8080/ eg:
                                          6fab52cb-1e50-4eb2-94c2-a710562a80b4-image.png

                                          Then resize to fit your screen and save the layout.

                                          NodeDSF - Native Node-Red integration with Duet boards.
                                          BtnCmd - Customise DWC with user defined buttons/layouts/panels (DWC Plugin)
                                          ReleaseMgr - Duet update info inside DWC.
                                          Repo

                                          chrishammundefined adammhaileundefined 2 Replies Last reply Reply Quote 2
                                          • chrishammundefined
                                            chrishamm administrators @MintyTrebor
                                            last edited by chrishamm

                                            @mintytrebor DWC lets you show the same content on the Jobs -> Webcam page if you check Embed webcam image in an iframe on the Settings -> General page and change the config + URL accordingly.

                                            PS: I'm rebuilding DuetPi to make the required changes from above obsolete. The next DSF version will fix it, too.

                                            Duet software engineer

                                            MintyTreborundefined 1 Reply Last reply Reply Quote 1
                                            • First post
                                              Last post
                                            Unless otherwise noted, all forum content is licensed under CC-BY-SA