MFOverlayRect Method (IMFFrame)
frame to use as overlay
frame to use as mask
target rectangle
overlay flags
transparency
additional properties
audio buffer ID
Mixes frames - overlays _pFrameOverlay frame over this frame, the position is from top-left corner, for 4:2:2 images (e.g. UYVY) horizontal position is aligned by two (e.g. 21->20). By default audio gain is calculated based on overlay size and transparency or can be specified via 'audio_gain' props.
Syntax

Parameters

_pFrameOverlay
frame to use as overlay
_pFrameMask
frame to use as mask
_pRect
target rectangle
_eMFOverlayFlags
overlay flags
_dblAlpha
transparency
_bsPropsList
additional properties
_bsAudioBufferID
audio buffer ID
See Also

Reference

IMFFrame Interface
IMFFrame Members