RE: webcam preview works, capture card is not working, black preview b

Tech-Archive recommends: Fix windows errors by optimizing your registry

Which model Winnov Videum card are you using? What driver version?
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Joe Domoto
donboco...multi-media made simple
www.donboco.com


"speedkills20@xxxxxxxxx" wrote:

I'm doing some final alpha testing for a free live broadcasting service
that Vidiac.com will be offering soon.

We wrote an app that shows a preview and postview of the camera
connected to it and then broadcasts to a remote server.

Long story short, I run the program on my laptop, works perfect with
the built-in webcam. I get preview and postview, broadcasts fine, etc.

I run the program on my PC with a Winnov Videum capture card and I get
black for both preview and postview (it does broadcast correctly, just
black). If I run Windows Media Encoder on that PC I do see both preview
and postview.

What is WME doing that is different from the SDK in this regard? I save
the name of the video and audio source in the registry and I verified
on that PC that it is storing and retrieving the correct name.

Here's the relavent code that I'm using and as I said, it does work on
my laptop.

using WMEncoderLib;
using WMPREVIEWLib;

try
{
int port =
Convert.ToInt16(Application.UserAppDataRegistry.GetValue("Port_number"));
IWMEncSourceGroupCollection SrcGrpColl;
IWMEncSourceGroup SrcGrp;
SrcGrpColl = Encoder.SourceGroupCollection;
SrcGrp = SrcGrpColl.Add("SG_1");
IWMEncSource SrcAud;
IWMEncSource SrcVid;
IWMEncSource SrcScript;
SrcVid = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
SrcAud = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO);
SrcScript = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_SCRIPT);
SrcScript.SetInput("", "UserScript", "");
SrcAud.SetInput(Convert.ToString(AudioSourceReg), "Device", "");
SrcVid.SetInput(Convert.ToString(VideoSourceReg), "Device", "");
SrcGrp.set_Profile("C:\\default.prx");

IWMEncDataViewCollection DVColl_preview =
SrcVid.PreviewCollection;
IWMEncDataViewCollection DVColl_postview =
SrcVid.PostviewCollection;

WMEncDataView Preview = new WMEncDataView();
WMEncDataView Postview = new WMEncDataView();
int lpreviewStream = DVColl_preview.Add(Preview);
int lpostviewStream = DVColl_postview.Add(Postview);

IWMEncBroadcast BrdCst = Encoder.Broadcast;

if (Application.UserAppDataRegistry.GetValue("Port_number") !=
null &
Convert.ToString(Application.UserAppDataRegistry.GetValue("Port_number")).Length
0)
{
BrdCst.set_PortNumber
(WMENC_BROADCAST_PROTOCOL.WMENC_PROTOCOL_HTTP, port);
}
else
{
BrdCst.set_PortNumber
(WMENC_BROADCAST_PROTOCOL.WMENC_PROTOCOL_HTTP, 8080);
}

Encoder.PrepareToEncode(true);
Encoder.Start();

Preview.SetViewProperties(lpreviewStream,
(int)Panel_Preview.Handle);
Preview.StartView (lpreviewStream);
Postview.SetViewProperties(lpostviewStream,
(int)Panel_Postview.Handle);
Postview.StartView (lpostviewStream);


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