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Thread: v4l/xawtv: screen goes black

  1. #1
    Join Date
    Sep 2006
    Location
    Denmark
    Beans
    202
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    v4l/xawtv: screen goes black

    I'm tryingt to use xawtv with my webcam. Running: 'xawtv -c /dev/video0' results immidiately in the screen turning black and the computer not repsonding to anything other than a switch to a text terminal (ctrl+alt+f1-6). From there I can then go back to X (ctrl+alt+f7) which will clear the screen and show my desktop again.

    ... where xawtv has printed out the following error message:
    /dev/video0 [v4l]: no overlay support
    and then soliders on ("trying to continue anyway"), managing to start a window with webcam capture (working flawlessly).

    Since the error seemed to come from video4linux, I tried running v4l-conf which results in exactly the same problem, only here I get a bonus error:
    /dev/video0 [v4l2]: ioctl VIDIOC_QUERYCAP: Invalid argument
    /dev/video0 [v4l]: no overlay support

    Can anybody tell me what this overlay support is or how I can get xawtv to skip fishing for it and just give me the webcam window without the black screen? I at first thought it was trying to go fullscreen and failing but there is an explicit fullscreen argument to xawtv that I'm not using... Any ideas?

  2. #2
    Join Date
    Mar 2006
    Location
    Roma, Italia
    Beans
    24
    Distro
    Ubuntu 7.04 Feisty Fawn

    Re: v4l/xawtv: screen goes black

    I also have this problem

  3. #3
    Join Date
    Sep 2006
    Location
    Denmark
    Beans
    202
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: v4l/xawtv: screen goes black

    Sorry to say, I never found a solution. With xawtv, anyway. However, I was already using VLC for video, so I was pleased to discover that it could easily be used to mirror the webcam including taking snapshots and taping video. Mind you it doesn't have the settings and the silliness of Cheese but IMO far more lightweight, stable and reliable.

    I don't knwo why the wiki doesn't suggest using it...

    EDIT: It does now
    Last edited by chochem; July 6th, 2008 at 04:40 PM.

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