How to check if a stream is live?

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I’m currently writing a function meant to check if a livestream is playing. My hope is that I will be able to use it to indicate to a viewer scrolling through a menu that a stream is taking place. My current attempt at the task has resulted in a function that essentially crashes the program, although the console debugger has no say as to why this is the case. Can anybody please help me figure out what my issue here is?

function IsLive() as Boolean
	test = CreateObject("roVideoScreen")
	port = CreateObject("roMessagePort")
	test.setMessagePort(port)

	vid = CreateObject("roAssociativeArray")
	vid.HDBranded = false
	vid.IsHD = true
	vid.StreamFormat = "mp4"
	vid.Stream = { url: "[livestream url]"
		bitrate: 2000,
		quality: true,
		contentid: "CalvaryCCM"
	}
	test.setContent(vid)	'note that the video isn't actually shown. This object is created simply to check if a livestream exists.

	while true
		msg = wait(0, port)
		if type(msg) = "roVideoScreenEvent" then
			if msg.isStatusMessage()
				print "status message: "; msg.GetMessage()
			else if msg.isPlaybackPosition()
				print "playback position: "; msg.GetIndex()
				return true
			else if msg.isRequestFailed()
				print "request failed - error: "; msg.GetIndex();" - "; msg.GetMessage()
				return false
			end if
		end if
	end while

	return false	'assuming this while loop is completely circumvented, function ends with assumption that the stream isn't live
end function