How to trace the creation and destruction of GstElement and GstPad, and link and unlink of GstPads?

[Jacky Lau]

Hi, all. I'm using playbin2 to play rtsp stream. As the server report audio
and video availability but send empty audio data, playbin2 don't create
video sink. And I want to trace the creation and destruction of GstElement
and GstPad, and link and unlink of GstPads. How to do it?
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