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Thread: dark image captured by streamer

  1. #1
    Join Date
    Jul 2007
    Location
    Arlington, VA
    Beans
    66
    Distro
    Ubuntu 10.10 Maverick Meerkat

    dark image captured by streamer

    I am trying to use streamer to set up a cron job to take a picture with my webcam once/minute. The image that it is capturing is too dark - does anyone know a way to lighten it? I am capturing the image as JPEG.

  2. #2
    Join Date
    Jan 2007
    Beans
    74

    Re: dark image captured by streamer

    I'm getting a black image, but I notice my webcam starts out dark when it begins recording. I'm guessing that I need to find a way to tell stream to let the image warm up a little...

    I'm thinking of just doing a 1sec video capture and converting it to a jpeg (somehow..)

  3. #3
    Join Date
    Jan 2007
    Beans
    74

    Re: dark image captured by streamer

    Tag=`date +'%y%m%d_%H%M%S'`
    streamer -c /dev/video0 -t 00:00:01 -b32 -o timelapse$Tag_00.jpeg
    rm *_0?\.jpeg

    I figured a way to "make it work" it's not pretty, but it... works!
    Since i'm using the "_00" part I had to make the Tag part to make unique images, but it's just a long timestamp.

    So you'll notice I added the -t 00:00:01
    that takes about one second of "pictures" all of them are dark until about *07.jpeg and 10 is usually the best (for me)

    That last one deletes the bad ones, and I'm left with one good one.

    Hope that helps, I'm going to use something like this to show my 3yo how plants grow with stop-motion etc...

  4. #4
    Join Date
    Sep 2009
    Beans
    2,330

    Re: dark image captured by streamer

    you can use v4l2ucp to set the cam with
    after its installed it comes up in system preferences as video4linux control panel

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