"can't load network provider" with MSVidCtl

"can't load network provider" with MSVidCtl
Hello,

I'm in the process of writing an application to display Digital TV in
an embedded web browser. I'm able to display NTSC/Cable TV, but when I
try to tune to a digital channel (.i.e. 7.1) I get the error "Can't
load network provider". Obviously, in the code below I don't have
anything about a Network Provider.

I've read Documentation on MSDN and came up with the conclusion that I
need to add some code to deal with the 'Network Provider', but I don't
know how when using the MSVidCtl (see: http://msdn.microsoft.com/en-us/library/ms788162(VS.85).aspx
and http://msdn.microsoft.com/en-us/library/ms787840(VS.85).aspx ).

Question:
1. Does anyone have a simple working sample to display digital tv (not
ATSC, any digital channel, channel 7.2) using the MSVidCtl?

2. Can anyone describe in layman's terms what a 'Network Provider' is/
provides?

3. Am I correct that ATSC is only digital TV channels with an antenna?

---------CODE---------------

<html>
	<head>
		<title>TV</title>
	</head>
	<body onload="initTuner();">
		<OBJECT ID="MSVidCtl" CLASSID="CLSID:B0EDF163-910A-11D2-
B632-00C04F79498E"></OBJECT><br/>
	</body>
	<script language="jscript" defer>

	var objTuner = {};

	function initTuner()
	{
		objTuner.TuneSpace = 0;
		objTuner.CLSID = 0;
		objTuner.Type = 0;
		objTuner.Channel = 7;
		objTuner.ChannelMinor = 2;
		objTuner.PhysicalChannel = 0;

		tuneDigital();
	}

	function tuneAnalog()
	{
		var tscontainer = new ActiveXObject("BDATuner.SystemTuningSpaces");
		var tspace = tscontainer("Cable");

		// objTuner aggregates tuning props
		objTuner.TuneSpace = tspace;
		objTuner.CLSID = tspace.CLSID;
		objTuner.Type = tspace.NetworkType;

		var treq = tspace.CreateTuneRequest();
		treq.Channel = objTuner.Channel;

		MSVidCtl.View(treq);
		MSVidCtl.Run();
	}

	function tuneDigital()
	{
		var tscontainer = new ActiveXObject("BDATuner.SystemTuningSpaces");
		var tspace = tscontainer("Digital Cable");

		// objTuner aggregates tuning props
		objTuner.TuneSpace = tspace;
		objTuner.CLSID = tspace.CLSID;
		objTuner.Type = tspace.NetworkType;
		objTuner.TuneSpace.CountryCode = 1; // USA

		var treq = objTuner.TuneSpace.CreateTuneRequest();
		var trLocator = new ActiveXObject("BDATuner.ATSCLocator");

		trLocator.PhysicalChannel = objTuner.Channel;

		treq.Locator = trLocator;
		treq.Channel = objTuner.Channel;

		treq.MinorChannel = objTuner.ChannelMinor;

		MSVidCtl.View(treq);
		MSVidCtl.Run(); // <-- throws exception!
	}

	</script>
</html>

--------------------------

Details:
OS: Windows XP Embedded
TV Card: FusionHDTV5 RT Lite (supports BSD)
Signal: ComCast Digital Cable (no cable box required)
date: Fri, 18 Jul 2008 15:59:30 -0700 (PDT) author: unknown