# File gstreamer/sample/media-type2.rb, line 69
  def seek_to_track(track)
    track_format = Gst::Format.find 'logical_stream'
    return false if track_format == nil
    @pipeline.play
                # XXX: todo, need Gst::Event
    event = gst_event_new_seek(format.id | Gst::EventSeek::METHOD_SET |
                               Gst::EventSeek::FLAG_FLUSH)
    return false if event == nil
    @metadata = nil
    @streaminfo = nil
    return true
  end