title: GStreamer issue with time
body: <p>I use GStreamer to play audio and regularly require a timestamp of where I am in the file.   </p>
  
  <p>If I adjust the rate of play, be it using a seek command specifying a new play rate or if I use a plugin like “pitch” to adjust the “tempo” component. All timings go out of the window as GStreamer adjusts the length of the audio and its current position to factor in the speed that it is playing at. So what was at say 18 seconds is now at 14 seconds, for example.<br>
  I have also tried stopping the audio and starting afresh passing the new settings and also issuing the seek with a rate of 1.00 and also the tempo rate neither has worked. I have run out of ideas for the moment, thus this plea to SO. </p>
  
  <p>Example code    </p>
  
  <pre><code>#Slow down rate of file play
  def OnSlow(self, evt):
      media_state = self.media_get_state()
      self.rate = Gpitch.get_property("tempo")
      if self.rate &gt; 0.2:
          self.rate = self.rate - 0.10
          Gpitch.set_property("tempo", self.rate)
          r = "%.2f" % (self.rate)
          self.ma3.SetLabel("Speed: "+r)
          if media_state == Gst.State.PLAYING or media_state == Gst.State.PAUSED:
              self.timer.Stop() #momentarily stop updating the screen
              seek_event = Gst.Event.new_seek(self.rate, Gst.Format.TIME, 
                  (Gst.SeekFlags.FLUSH),#NONE),
                  Gst.SeekType.NONE, 0, Gst.SeekType.NONE, -1)
              Gplayer.send_event(seek_event)
              time.sleep(0.1)
              self.timer.Start() #Restart updating the screen
  </code></pre>
  
  <p>I have tried multiplying the duration and the current position by the adjustment in an attempt to pull or push the timestamps back to their positions, as if it were being played at normal speed but to no avail.</p>
  
  <p>I have been pulling my hair out over this and the real kick in the teeth, is that, if I perform the same task using Vlc as my audio engine it works but I have to alter the pitch separately. The whole reason for moving over to GStreamer was that the pitch plugin tracks the “tempo” component and yet if I cannot get accurate and consistent timestamps, the project is dead in the water.    </p>
  
  <p>My question, has anybody a) come across this issue and b) mastered it</p>