Re: [gst-devel] XOverlay behaviour change ?

[Tristan M. <tr...@sa...>]

2010/5/12 Olivier Aubert <oli...@li...>

> Hi Stefan
>
> Thanks for the answer, but this is not the root of the cause since I
> also tried this approach and the behaviour is identical. And anyway,
> directly using set_xwindow_id is mentioned in the XOverlay doc (this
> specific information was added on january 2010 by Tim, so I assume that
> it is correct):
>

Thanks for bringing this up Olivier. I have the same issue in my program,
although interestingly glimagesink does _not_ suffer from this behavior.


>
> >From gst-libs/gst/interfaces/xoverlay.c :
>  * There are two basic usage scenarios: in the simplest case, the
> application
>  * knows exactly what particular element is used for video output, which is
>  * usually the case when the application creates the videosink to use
>  * (e.g. #xvimagesink, #ximagesink, etc.) itself; in this case, the
> application
>  * can just create the videosink element, create and realize the window to
>  * render the video on and then call gst_x_overlay_set_xwindow_id()
> directly
>  * with the XID or native window handle, before starting up the pipeline.
>  *
>  * In the other and more common case, the application does not know in
> advance
>  * what GStreamer video sink element will be used for video output.
>  * [...use prepare-xwindow-id...]
>
> I am in the first case (instanciating exactly the sink I need), and
> calling set_xwindow_id after my embedding widget is realized.
>
> Olivier
>
> On Wed, 2010-05-12 at 18:49 +0300, Stefan Kost wrote:
> > Olivier Aubert wrote:
> > > Hello
> > >
> > > In my python/gtk/gstreamer based application (www.advene.org), I embed
> a
> > > xvimagesink (on linux with gtk 2.20)/ximagesink (on macos x with gtk
> > > 2.18) in a gtk.Socket, calling set_xwindow_id after the gtk.Socket is
> > > realized.
> > >
> > You should call set_xwindow_id() in reply to the "prepare-xwindow-id"
> > element message on the gstreamer bus. Anything else is sheer luck :) The
> > GstXOverlay docs have examples.
> >
> > Stefan
> > > It worked alright with gst-plugins-good 0.10.21. However, since the
> > > upgrade to 0.10.22, the behaviour changed: the image is not displayed
> > > until the window has received an expose event (basically, I hide and
> > > show the window).
> > >
> > > I had a quick look at the git logs, but did not find anything that
> > > seemed relevant. Has there been a change in the xoverlay API that I
> > > should be aware of ? And if not, are there any hints to help me debug
> > > this issue?
> > >
> > > Thanks
> > > Olivier
> > >
> > >
> > >
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-- 
Tristan Matthews
email: tr...@sa...
web: http://tristanswork.blogspot.com