pmt-info callback not getting invoked

[Yogesh Tyagi]

Hi,

I got to work on a gstreamer based test app which plays media from http
source.In this application following callback has been registered to
receive pmt information.

g_signal_connect(G_OBJECT(demuxer), "notify::pmt-info", (GCallback)
demuxer_notify_pmt_info, NULL);

When I run this application I never see "demuxer_notify_pmt_info" method
getting called.
Can somebody please let me know when this callback function will be
activated so that I can see the pmt info of the stream.

Is there any way to invoke get_property methods of plugins like e.g
set_property methods can be  invoked with gst-launch when we pass
"property-name=value" to gst-launch.

Thanks,
Yogesh
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