Parse a #GstNavigation message of type #GST_NAVIGATION_MESSAGE_EVENT and extract contained #GstEvent. The caller must unref the event when done with it.
A #GstMessage to inspect.
a pointer to a #GstEvent to receive the contained navigation event.
true if the message could be successfully parsed. false if not.
Parse a #GstNavigation message of type #GST_NAVIGATION_MESSAGE_EVENT and extract contained #GstEvent. The caller must unref the event when done with it.