@staticmethod
def _probe_drop(pad, probe_info):
    return Gst.PadProbeReturn.DROP

def change_window_handle(self, new_handle):
    videoconvert = self._pipeline.get_by_name('videoconvert')
    autovideosink = self._pipeline.get_by_name('autovideosink')

    # Install a blocking probe on the videoconvert so that it can't
    # feed any more data into the autovideosink
    source_pad = videoconvert.get_static_pad('src')
    probe_id = source_pad.add_probe(
        Gst.PadProbeType.BLOCK,
        self._probe_drop,
    )

    # Unlink the autovideosink, stop it, and remove it
    source_pad.unlink(source_pad.get_peer())
    autovideosink.set_state(Gst.State.NULL)
    self._pipeline.remove(autovideosink)

    # Make a new autovideosink and link it
    new_sink = Gst.ElementFactory.make('autovideosink', 'autovideosink')
    self._pipeline.add(new_sink)
    source_pad.link(new_sink.get_static_pad('sink'))

    # Remove the probe and set the new sink to PLAYING
    source_pad.remove_probe(probe_id)
    new_sink.sync_state_with_parent()

    # For some reason, the new sink gets stuck in READY state. Even
    # the pipeline goes back into PAUSED state for some reason.
    print('State of the new sink:', new_sink.get_state(0.1))
    print('State of the pipeline:', self._pipeline.get_state(0.1))