Overlay. Property Overlay As Boolean Enable/disable video operlay preview If HasOverlay property is TRUE, Overlay can be used instead of Preview property to show live video on-screen. Overlay video doesn't travel through main memory and it consumes almost no CPU resources. However, frame grabbing doesn't work. To be able to capture still frames and put text/bitmap over the video, you must use Preview property. Connected proprety must be set to TRUE before you can use this property.
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Overlay. Property Overlay As Boolean Enable/disable video operlay preview Property Overlay As Boolean If HasOverlay property is TRUE, Overlay can be used instead of Preview property to show live video on-on- screen. Overlay video doesn't travel through main memory and it consumes almost no CPU resources. However, frame grabbing doesn't work. To be able to capture still frames and put text/bitmap over the video, you must use Preview property. Connected proprety must be set to TRUE before you can use this property.
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Sources: Videocapx Activex Control Reference