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WM_CAP_SET_SCALE message

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The WM_CAP_SET_SCALE message enables or disables scaling of the preview video images. If scaling is enabled, the captured video frame is stretched to the dimensions of the capture window. You can send this message explicitly or by using the capPreviewScale macro.

WM_CAP_SET_SCALE 
wParam = (WPARAM) (BOOL)f; 
lParam = 0L;

Parameters

f

Preview scaling flag. Specify TRUE for this parameter to stretch preview frames to the size of the capture window or FALSE to display them at their natural size.

Return Value

Returns TRUE if successful or FALSE otherwise.

Remarks

Scaling preview images controls the immediate presentation of captured frames within the capture window. It has no effect on the size of the frames saved to file.

Scaling has no effect when using overlay to display video in the frame buffer.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Vfw.h

See also

Video Capture

Video Capture Messages