[gst-devel] v4l2src GstTuner interface

[Julien Isorce]

Hi,

Thx a lot for the explanation. It resolved my problem, I can change the
physical input (s-video, composite, ...) now.

Sincerely,

Julien

2008/4/13, Stefan Kost <ensonic at hora-obscura.de>:
>
> hi julien,
>
> Julien Isorce schrieb:
>
> > Hi,
> >
> > I am trying to select physical input (S-Video, Composite, ...)
> >
> > The following code :
> >
> > ------------
> > ...
> > videodevicesrc = gst_element_factory_make("v4l2src", "videodevicesrc");
> > ...
> > GstTuner *tuner = GST_TUNER (videodevicesrc);
> > ...
> > ------------
> >
> > leads to:
> >
> > (<unknown>:17146): GStreamer-CRITICAL **: gst_implements_interface_cast:
> > assertion `gst_element_implements_interface (GST_ELEMENT (from),
> > iface_type)' failed
> >
>
>
> You can only cast in PAUSED or PLAYING (not sure about READY). Basically
> the devices has to be opened first, before the element knows that the
> underlying hardware has support for tuner. The gst_implements_interface
> mechanism is basically a hack to conditinally implement interfaces.
>
> Stefan
>
>
> >
> > I know that v4l2src implements this interface and
> > I got code example from
> > http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup<
> > http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup
> > >
> >
> > The installed packages is
> > gstreamer0.10-plugins-good_0.10.6-0ubuntu4_i386.deb
> >
> > The following command lien works very fine : gst-launch-0.10 v4l2src !
> > xvimagesink
> >
> > Where am I wrong ?
> >
> > Sincerely
> >
> > Julien
> >
> >
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> >
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>
>
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