IWMEncSource.PreviewCollection
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The PreviewCollection property retrieves a collection of preview objects for the source stream.
Syntax
IWMEncDataViewCollection = IWMEncSource.PreviewCollection
Parameters
This property takes no parameters.
Property Value
An IWMEncDataViewCollection object, which is a collection of preview objects.
Remarks
This property is read-only. A preview is a WMEncDataView object that renders content in a window before compression.
To display previews and postviews, you must add the Windows Media Encoder Preview Control reference to the project. For more information, see Programming in Visual Basic.
Example Code
' Create a WMEncoder object.
Dim Encoder As WMEncoder
Set Encoder = New WMEncoder
' Configure the encoding session including the input sources,
' the profile, and the output.
' Retrieve an IWMEncDataViewCollection object from the
' video source object to display a preview.
Dim DVColl_Preview As IWMEncDataViewCollection
Set DVColl_Preview = SrcVid.PreviewCollection
' Create a WMEncDataView object.
Dim PreView As WMEncDataView
Set PreView = New WMEncDataView
' Add the WMEncDataView object to the collection.
Dim lPreviewStream As Long
lPreviewStream = DVColl_Preview.Add(PreView)
' Start encoding.
Encoder.Start
' Display the stream preview in a frame called PreviewFrame.
PreView.SetViewProperties lPreviewStream, PreviewFrame.hWnd
PreView.StartView (lPreviewStream)
Requirements
Reference: Windows Media Encoder
Library: wmenc.exe
See Also
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