gstreamer problem after set element state: GST_STATE_PLAYING

[quang_openstack]

Hi everyone,
I got a problem about gstreamer 
After I set:
    gst_element_set_state (pipeline, GST_STATE_PLAYING);
The whole code after this line does not work.
For example, I do print characters like
    printf("Start playing.\n");
It does not print out. 
Are the anyone can give me some suggestion why this happen and how to fix
it?
Thank in advance.



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