[gst-devel] v4lsrc confusion

Bertrik Sikken bertrik at zonnet.nl
Sun Dec 19 08:31:02 CET 2004

Hi all,

I was trying to set up a pipeline to view the video stream coming
from my webcam (sonix based), using a V4L(1) driver. The pipeline
I'm trying to use is
v4lsrc -> ffmpegcolorspace -> ximagesink

Setting this up in gst-editor gives me a dialog telling me that
it could not set a parameter, but after dismissing this I can
see the webcam video stream in a window.
If I try this using gst-launch
gst-launch v4lsrc ! ffmpegcolorspace ! ximagesink
it gives me a similar message (from the v4lsrc module).
Apparently it tries to set the framerate and is unsuccessful
doing that. (It tries to set it at 1 fps and at 30 fps).

What does this warning/error mean?
I thought v4l does not have any property to set the framerate.
I tried various combinations of setting properties sync-mode
and autoprobe-fps, but without success.

Another, more general thing I wonder about:
Is it possible to have controls for v4l?
For example, being able to control brightness, contrast,
whiteness, color and hue.

Kind regards,

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