roVideoScreen problem with dual audio

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Here is my code that I am using now does not work where double audio


Sub playVideoMovies(episode As Object)
 
  port = CreateObject("roMessagePort")
  screen = CreateObject("roVideoScreen")
  screen.SetMessagePort(port)
  screen.SetCertificatesFile("common:/certs/ca-bundle.crt")
  screen.InitClientCertificates()
  
  vid_to_play = episode
  
    vid_to_play = {
      Stream: { url: episode.StreamUrl }
      StreamFormat: "mkv"
	  StreamBitrates: "0"
      Title: episode.Title
	  SubtitleUrl: episode.SubtitleUrl
	  PlayStart: episode.PlayStart
      AudioFormat: "dolby-digital"		  
    }
	
  screen.SetLoop(true)
  screen.SetPositionNotificationPeriod(1)
  screen.SetContent(vid_to_play)
  doCerts(screen)
  screen.Show()

  
  while (true)
    msg = wait(250, port)

    if type(msg) = "roVideoScreenEvent" then
      print "showHomeScreen | msg = "; msg.getMessage() " | index = "; msg.GetIndex()
      if msg.isScreenClosed()
        print "Screen closed"
		exit while		
      elseif msg.isStatusMessage()
        print "Video status: "; msg.GetIndex(); " " msg.GetData() 
      elseif msg.isButtonPressed()
        print "Button pressed: "; msg.GetIndex(); " " msg.GetData()
      elseif msg.isPlaybackPosition() then
	    'print "Play position: "; msg.GetIndex(); " " msg.GetData()
        nowpos = msg.GetIndex()
        RegWrite(episode.ContentId, nowpos.toStr())
      elseif msg.isFullResult() then
        RegWrite(episode.ContentId, "0")
		exit while
      elseif msg.isPartialResult() 
	    print "Video playback was interrupted: "; msg.GetType()
		exit while
      else if msg.isRequestFailed()
        print "request failed – error: "; msg.GetIndex();" – "; msg.GetMessage()
        exit while
      else if msg.isRequestInterrupted()
        print "request failed – error: "; msg.GetIndex();" – "; msg.GetMessage()
      else
        print "Unexpected event type: "; msg.GetType()
      end if
    else
      'print "Unexpected message class: "; type(msg)
    end if

  end while

End Sub