Check if HLS Stream is Up and Show Error Message If Not?

Question

Is there an easy way to check if an HLS (M3U8) stream is available and show an error message if not? I'm using the following code to play an M3U8 stream, but if the stream is not available, the "Retrieving" message just displays for an indefinite amount of time.

I'd like to show an error right away if the stream isn't up.

sub onButtonSelected()
  'Ok'
  if m.ButtonGroup.buttonSelected = 0
    m.Video.visible = "true"
    m.Video.control = "play"
    m.Video.setFocus(true)
  'Add error message logic here if stream doesn't play

  'Exit button pressed'
  else
    m.Exiter.control = "RUN"
  end if
end sub

Answer 1

You should observe state of the video player.

sub onButtonSelected()
  'Ok'
  if m.ButtonGroup.buttonSelected = 0
    m.Video.visible = "true"
    ' This observer should not be set here because it will add new observer every time you
    ' select the button. For demonstration purposes only.
    m.video.observeField("state", "onVideoStateChanged")
    m.Video.control = "play"
    m.Video.setFocus(true)

  'Exit button pressed'
  else
    m.Exiter.control = "RUN"
  end if
end sub


sub onVideoStateChanged(event as Object)
    if event.getData() = "error"
        ' Show error dialog here
    end if
end sub

You can also see the error message/code by checking errorMsg/errorCode fields of the Video node.