Hardware Overlay with Push Source

The sample filter "Push Source" included in DXSDK does not use Hardware
Overlay surface.
If I want to use Hardware Overlay with Push Source, where do I modify in the
code?

Actually, I don't understand what difference makes it have no hardware
overlay.

MSDN DirectX document says it's because the filter passes DIB images to the
renderer but it doesn't make sense. Don't other video codecs pass RGB or YV11
format images to the renderer?

Thank you.
.

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