Why can't a MediaPipeline be restarted after a stop?

[Claus Dietrich <claus.dietrich@xxxxxxxxxx>]

Can someone explain why I can start and stop the playing of a web-radio 
stream with a MediaPipeline but not restart it?

My practice shows, that a pipeline which contains a LinkLaterTo-Link 
shows this behaviour. As a consequence I have to Null the pipeline, set 
it up again and start it again which is inconsistent and inconvenient.

Here a minimum project with this problem:

 Private pl As MediaPipeline
 Private src As MediaControl
 Private cnv As MediaControl
 Private snk As MediaControl

Public Sub Form_Open()

  'Generate Pipeline
  pl = New MediaPipeline

  'Generate MediaControls
  src = New MediaControl(pl, "uridecodebin")
  src["uri"] = 
"http://icecast.ndr.de/ndr/ndr1wellenord/kiel/mp3/128/stream.mp3";
  cnv = New MediaControl(pl, "audioconvert")
  snk = New MediaControl(pl, "autoaudiosink")

  'Link MediaControls
  src.LinkLaterTo(cnv)
  cnv.LinkTo(snk)

End

Public Sub ButtonStart_Click()

  pl.play

End

Public Sub ButtonStop_Click()

  pl.Stop

End

Best regards

Claus