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Thread: "Could not connect to video device (/dev/video0)"

  1. #1

    "Could not connect to video device (/dev/video0)"

    If one does a search for "could not connect to video device" (in quotes to group all words together for the search), you will find that there are several unanswered and unresolved problem postings relating to inability to open /dev/video0.

    I too have this problem when trying to use camorama. Cheese works, but with poor resolution (I have a 12 MB camera that on Ubuntu only does 320 X 160 resolution).
    arv@arv-desktop:~$ lsusb
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 003 Device 004: ID 046d:c03d Logitech, Inc. M-BT69a Pilot Optical Mouse
    Bus 003 Device 003: ID 0ac8:3330 Z-Star Microelectronics Corp.
    Bus 003 Device 002: ID 0451:1446 Texas Instruments, Inc. TUSB2040/2070 Hub
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    arv@arv-desktop:~$

    The Z-star device is my camera, a "Sirius USB2.0 Camera (/dev/video0)" unit.

    Permissions for the video devices in ls -la /dev/v* look like this:

    arv@arv-desktop:~$ ls -la /dev/v*
    crw-rw---- 1 root tty 7, 0 2009-10-24 10:03 /dev/vcs
    crw-rw---- 1 root tty 7, 1 2009-10-24 10:04 /dev/vcs1
    crw-rw---- 1 root tty 7, 2 2009-10-24 10:04 /dev/vcs2
    crw-rw---- 1 root tty 7, 3 2009-10-24 10:04 /dev/vcs3
    crw-rw---- 1 root tty 7, 4 2009-10-24 10:04 /dev/vcs4
    crw-rw---- 1 root tty 7, 5 2009-10-24 10:04 /dev/vcs5
    crw-rw---- 1 root tty 7, 6 2009-10-24 10:04 /dev/vcs6
    crw-rw---- 1 root tty 7, 7 2009-10-24 10:04 /dev/vcs7
    crw-rw---- 1 root tty 7, 8 2009-10-24 10:03 /dev/vcs8
    crw-rw---- 1 root tty 7, 128 2009-10-24 10:03 /dev/vcsa
    crw-rw---- 1 root tty 7, 129 2009-10-24 10:04 /dev/vcsa1
    crw-rw---- 1 root tty 7, 130 2009-10-24 10:04 /dev/vcsa2
    crw-rw---- 1 root tty 7, 131 2009-10-24 10:04 /dev/vcsa3
    crw-rw---- 1 root tty 7, 132 2009-10-24 10:04 /dev/vcsa4
    crw-rw---- 1 root tty 7, 133 2009-10-24 10:04 /dev/vcsa5
    crw-rw---- 1 root tty 7, 134 2009-10-24 10:04 /dev/vcsa6
    crw-rw---- 1 root tty 7, 135 2009-10-24 10:04 /dev/vcsa7
    crw-rw---- 1 root tty 7, 136 2009-10-24 10:03 /dev/vcsa8
    crw-rw----+ 1 root video 81, 0 2009-10-24 10:03 /dev/video0

    /dev/v4l:
    total 0
    drwxr-xr-x 4 root root 80 2009-10-24 10:03 .
    drwxr-xr-x 17 root root 4160 2009-10-24 11:52 ..
    drwxr-xr-x 2 root root 60 2009-10-24 10:03 by-id
    drwxr-xr-x 2 root root 60 2009-10-24 10:03 by-path
    arv@arv-desktop:~$

    And this is what I get when opening camorama using the "-D" debug option:
    arv@arv-desktop:~$ camorama -D

    VIDIOCGCAP
    device name = Sirius USB2.0 Camera
    device type = 1
    can use mmap()
    # of channels = 1
    # of audio devices = 0
    max width = 320
    max height = 240
    min width = 48
    min height = 32

    VIDIOCGWIN
    x = 0
    y = 0
    width = 160
    height = 120
    chromakey = 0
    flags = 0

    VIDIOCGWIN
    x = 0
    y = 0
    width = 160
    height = 120
    chromakey = 0
    flags = 0

    VIDIOCGPICT:
    bright = 32768
    hue = 0
    colour = 26214
    contrast = 32768
    whiteness = 19661
    colour depth = 16
    YUYV
    Along with the pop-up saying "Could not connect to video device (/dev/video0)".

    Any idea what is broken, missing, wrongly configured, or what the problem might be?

    Seems that I am not the only one with this problem.

    Arv
    _._

    UPDATE:
    Found this command on another thread, not associated with my problem, and it fixed the "could not open /dev/video0" problem:

    export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so

    Resolution still only 320 X 160 for 12 megapixel camera. I'm still working on that as a separate, probably driver, problem.
    _._

    _._
    Last edited by arvevans; October 24th, 2009 at 08:10 PM. Reason: Added subsequent information...SOLVED, sort of
    POSIX

  2. #2
    Join Date
    May 2007
    Beans
    118

    Re: "Could not connect to video device (/dev/video0)"

    I'm having similar problems with my Logitech S7500. It works fine in Skype, but I get the same error in Camorama and no image, or in Cheese. It appears I haven't got any libraries called libv4l* anywhere. I've done a package search in Synaptic for v4l, but nothing appears that seems to be any dev or library packages. Am I missing something?

  3. #3

    Re: "Could not connect to video device (/dev/video0)"

    Davemar

    If you do a Synaptic search for "video" you will find a bunch of video libraries. I'm not sure how to determine which ones might fix your problem(s).

    Arv
    _._
    POSIX

  4. #4
    Join Date
    May 2007
    Beans
    118

    Re: "Could not connect to video device (/dev/video0)"

    I think my problem is that I'm still on 8.04, which hasn't got those libraries in the packages. I'll probably have to upgrade to 9.?? (depending on opinions to which is more stable) to get things working properly for webcam stuff.

  5. #5
    Join Date
    Sep 2009
    Beans
    2,330

    Re: "Could not connect to video device (/dev/video0)"

    open a terminal type, gstreamer-properties click enter
    click video try v4l1 and v4l2
    click the bottom test button for each 1

    try the cam in cheese

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