public Event.flush_start ()
Allocate a new flush start event.
The flush start event can be sent upstream and downstream and travels out-of-bounds with the dataflow.
It marks pads as being flushing and will make them return FLUSHING
when used for data flow with push,
and pull_range. Any event (except a
FLUSH_STOP) received on a flushing pad will return
Elements should unlock any blocking functions and exit their streaming functions as fast as possible when this event is received.
This event is typically generated after a seek to flush out all queued data in the pipeline so that the new media is played as soon as possible.
a new flush start event.