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You can do this using the MGPreview object of MGCORElib:

''C# sample code:'' 

<source lang="cpp">

//Get the input stream
string vidName;
string audName;
object mgObject;
m_objVideoMixer.GetInputDevice(0, out vidName, out audName, out mgObject);
MGVIDEOMIXERLib.IMGObject mgObj = (MGVIDEOMIXERLib.IMGObject)mgObject;

//Create preview object for this stream
MGCORELib.CoMGPreviewClass preview = new MGCORELib.CoMGPreviewClass();

//Enable video preview
preview.EnableAudio(0, 0);
preview.EnableVideo(0, 1);

//Set panel for this preview
preview.SetOutputWindow(0, panelStream1.Handle.ToInt32(), 0);

//Initialize preview object
preview.Init(mgObj, "stream 1 preview");

//Start preview object
preview.Start(0);
</source>

[[Category: Vision Mixer SDK FAQ]]