[gst-devel] Troubles with gstreamer, pygtk and ubuntu karmic

[Ron McOuat]

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()

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.

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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