[gst-devel] Troubles with gstreamer, pygtk and ubuntu karmic
Jan Schmidt
thaytan at noraisin.net
Mon Nov 16 20:46:25 CET 2009
On Mon, 2009-11-16 at 11:37 -0800, Ron McOuat wrote:
> I had the same problem. The tutorial version of the code for handling
> the assignment of the "prepare-xwindow-id" message is incomplete.
> Looking in the example code under gst-python reveals a few more steps. I
> changed the tutorial code to look like the following and it worked.
>
> def on_sync_message(self, bus, message):
> if message.structure is None:
> return
>
> if message.structure.get_name() == "prepare-xwindow-id":
> # Assign the viewport
> gtk.gdk.threads_enter()
> gtk.gdk.display_get_default().sync()
> imagesink = message.src
> imagesink.set_property("force-aspect-ratio", True)
> imagesink.set_xwindow_id(self.movie_window.window.xid)
> gtk.gdk.threads_leave()
This is due to GTK+ making a subtle change in the handling of GdkWindow
XIDs, for the Client Side Windows support. You now need to be sure to
take the GDK lock, because they replaced a simple accessor macro with a
function that tries to create a native X server window if one doesn't
yet exist.
See bug https://bugzilla.gnome.org/show_bug.cgi?id=599885
> The code form the examples directory in gst-python is not the same as
> above but I pulled in the thread sync code to make it work.
>
> Here is the code (commented out) from the examples
>
> # Example code from
> #
> http://cgit.freedesktop.org/gstreamer/gst-python/tree/examples/maemogst.py
> #
> # all this is needed to sync with the X server before giving the
> # x id to the sink
> #gtk.gdk.threads_enter()
> #gtk.gdk.display_get_default().sync()
> #self.video_widget.set_sink(message.src)
> #message.src.set_property("force-aspect-ratio", True)
> #gtk.gdk.threads_leave()
>
>
>
> I have also had trouble with the NVidia X server not displaying the
> video with the proper colour map. If I move a recorded file off a cam to
> another machine it displays the correct colour map but I am sure that is
> a separate issue.
I had this (one time) issue as well. Going into Totem, opening the
Preferences->Display tab, and resetting the Hue slider to the center
fixes it. I think NVidia changed the meaning of the Hue slider values,
making totem's cached value actually cause incorrect hue.
J.
>
> Hope that helps,
>
> Ron
>
>
> Nicolas Bertrand wrote:
> > Hi,
> > I use gstreamer and pygtk for webcam acquisition. Since I upgraded to
> > ubuntu karmic 9.10, I was facing some application freeze/crash.
> >
> > Most of the time the application freeze and webcam application does
> > not start.
> >
> > For illusrate my problem I use the example from pygst tutorial ( simple
> > webcam acquisition and display) :
> > http://pygstdocs.berlios.de/pygst-tutorial/webcam-viewer.html
> >
> > This program operates normaly on ubuntu dapper drake and ubuntu jaunty
> > jackalope. I execute the program at least 5 times and webcam
> > acquisition, is always OK.
> >
> > If I execute the same script on ubuntu karmic, sometimes its ok and
> > sometimes not. Most of the the time the webcam acquisition fails.
> >
> > What I noticed under karmic :
> > If I use videotestsrc instead of v4l2src, I still having the problem
> > --> so its seems not due to webcam acquisition.
> > When display is not 'forced' to a Drawing area, i.e. the
> > acquisition starts in another window in place of application window, the
> > script never crash and webcam acquisition is good. For doin that doin I
> > don't connect the signal 'sync-message::element'
> >
> > Do anyone has facing this problem or have an idea for how to
> > understand/debug this problem.
> >
> > I post this message on gstreamer and pygtk, because I do not know where
> > the problem or bad usage come from ?
> >
> > Thanks in advance for help.
> >
> > Nico
> > https://launchpad.net/~nico-inattendu
> >
> >
> >
> >
> >
> >
> >
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--
Jan Schmidt <thaytan at noraisin.net>
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