issue with snapshots from command line via gstreamer

Tomeu Vizoso tomeu at sugarlabs.org
Thu Jun 18 05:02:47 EDT 2009


On Wed, Jun 17, 2009 at 23:31, Richard A. Smith<richard at laptop.org> wrote:
> I'm using a small script to take snapshots with an OLPC every 30 seconds
> using a gstreamer command line.
>
> The wiki (http://wiki.laptop.org/go/Programming_the_camera) lists the
> following as one method of doing this.
>
> gst-launch-0.10 v4l2src ! ffmpegcolorspace ! pngenc ! filesink
> location=foo.png
>
> However, this has a flaw because the camera is powered off when not in
> use.  When powered up the AGC circuit has to calibrate and that takes
> more time than the above allows.  You end up with pictures that have
> various funky types of brightness and white balance  issues.
>
> Anybody know if there is a way to make gstreamer take multiple snapshots
> and then just use the last one.

Maybe with a python script that uses the gstreamer bindings? You can
check the code of any of the activities that use the camera.

Regards,

Tomeu

> --
> Richard Smith  <richard at laptop.org>
> One Laptop Per Child
> _______________________________________________
> Devel mailing list
> Devel at lists.laptop.org
> http://lists.laptop.org/listinfo/devel
>


More information about the Devel mailing list