Show video on Windows

[Manuel]

Hi again,

now I verified that the hack does work.

The problem with my sync-message-handler not getting called was that I
was running Windows in a virtual machine (no real 3D hardware
acceleration). In this case the used video sink probably just didn't
support embedded video. For example dshowvideosink and d3dvideosink does
support embedding the video. Running the same code on a native
non-virtualized Windows works as expected: the sync-message-handler is
called so that I can set the window handle of the drawing area. Playback
is working fine now.

See:
http://docs.gstreamer.com/display/GstSDK/Basic+tutorial+16%3A+Platform-specific+elements

Best Regards,
Manuel


Am 28.07.2015 um 20:36 schrieb Manuel:
> Hi Marwin,
> 
> thank you for your your reply.
> I would try that, but I noticed, that my on_sync_message-method is never
> called on Windows. How did you handle that?
> 
> I noticed, that you are using Stackoverflow, too. ;)
> You can find my current code here:
> http://stackoverflow.com/questions/25823541/get-the-window-handle-in-pygi/31555784
> 
> Best regards
> Manuel
> 
> 
> Marwin Schmitt:
>> Hi,
>>
>> I had the same problem and reported the bug to the gnome bugtracker quite a while ago .. but since it is still not fixed, I used a dirty hack, accessing the gdk_win32_window_get_handle via ctypes (and it took me forever no experience with that).
>>
>> Here is the code:
>>
>> def on_sync_message(bus, message):
>>         if message.get_structure() is None:
>>             return
>>         if GstVideo.is_video_overlay_prepare_window_handle_message(message):#                                    
>>             Gdk.threads_enter()
>>             #get the gdk window and the corresponding c gpointer
>>             drawingareawnd = drawingarea.get_property("window")            
>>             if not drawingareawnd.has_native():#ensure_native should be called before, e.g. on realize
>>                 print("Error - drawing does not have a native window - this window will freeze when moved or resized")
>>             ctypes.pythonapi.PyCapsule_GetPointer.restype = ctypes.c_void_p
>>             ctypes.pythonapi.PyCapsule_GetPointer.argtypes = [ctypes.py_object]
>>             drawingarea_gpointer = ctypes.pythonapi.PyCapsule_GetPointer(drawingareawnd.__gpointer__, None)
>>
>>             #get the win32 handle
>>             gdkdll = ctypes.CDLL ("libgdk-3-0.dll")
>>             hnd = gdkdll.gdk_win32_window_get_handle(drawingarea_gpointer)
>>             #pass it to the sink
>>             sink.set_window_handle(hnd)
>>             Gdk.threads_leave()
>>
>> Cheers
>> Marwin
>>
>> ----- Original Message -----
>> To: gstreamer-devel at lists.freedesktop.org
>> Sent: Friday, September 26, 2014 7:48:32 PM
>> Subject: Show video on Windows
>>
>> Hi all,
>>
>> in my program I use PyGObject/PyGI and GStreamer to show a video in my
>> GUI. The video is shown in a Gtk.DrawingArea and therefore I need to get
>> it's window-handle in the realize-signal-handler. On Linux I get that
>> handle using:
>>
>> drawing_area.get_property('window').get_xid()
>> But how do I get the handle on Windows?
>>
>> I searched on the internet but found only examples for PyGtk using
>> window.handle which does not work using PyGI.
>>
>> The GStreamer documentation provides an example which uses the
>> GDK_WINDOW_HWND macro to get the handle. This macro uses AFAIK
>> gdk_win32_drawable_get_handle. But how to do it in Python using PyGI?
>>
>> Best regards
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
> 
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