[gst-devel] Gstreamer bus and message

[MailingList SVR]

In data venerdì 29 maggio 2009 11:11:21, MailingList SVR ha scritto:
: > Hi all,
> 
> I'm trying to build a gstreamer application all is fine until I try to get a message from the bus. I tested the sample python webcam viewer (http://pygstdocs.berlios.de/pygst-tutorial/webcam-viewer.html) and all is fine: when I start the viewer messages are sent to the bus and if I disconnect the camera an error message is sent to the bus, good,
> 
> so I added the following code to my own application (twisted based), this is a cut and paste from the webcam viewer app:
> 
> bus = self.pipeline.get_bus()
> bus.add_signal_watch()
> bus.connect("message",self.on_message)
> 
> and:
> 
> def on_message(self,bus,message):
> 		print 'new message'
> 		t=message.type
> 		print t
> 		print type(t)
> 
> this time i can start and see the video but no message go to the bus neither when I start to see the video or disconnect the camera and no errors are given, maybe the gstreamer bus rely on gtk? Can I use the bus inside twisted?
> 
> What I missed?
> 
> thanks
> Nicola
> 

Ok the problem seems solved, I have to start my gstreamer pipeline as gobject loop and from my twisted frontend I have to start the loop as a separate thread .... nothing simpler? Is this the only way?

Nicola
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