Called when a new event is available.
This callback is called from the streaming thread.
The new event can be retrieved with
gst_app_sink_pull_event() either from this callback
or from any other thread.
The callback should return true if the event has been handled,
false otherwise.
Called when a new event is available. This callback is called from the streaming thread. The new event can be retrieved with gst_app_sink_pull_event() either from this callback or from any other thread. The callback should return true if the event has been handled, false otherwise.