The MCIWndPutSource macro redefines the coordinates of the source rectangle used for cropping the images of an AVI file during playback. You can use this macro or explicitly send the MCIWNDM_PUT_SOURCE message.
LONG MCIWndPutSource(
hwnd,
prc
);
Returns zero if successful or an error otherwise.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
MCIWnd Window Class Overview, MCIWnd Macros, MCIWNDM_PUT_SOURCE