WM_CAP_SET_PREVIEWRATE

	Overview

	Group

	Quick Info

The WM_CAP_SET_PREVIEWRATE message sets the frame display rate in preview mode. You can send this message explicitly or by using the capPreviewRate macro.

wParam = (WPARAM) (wMS);

lParam = 0L;

Parameters
wMS

Rate, in milliseconds, at which new frames are captured and displayed.

Return Values
Returns TRUE if successful or FALSE if the capture window is not connected to a capture driver.

Remarks
The preview mode uses substantial CPU resources. Applications can disable preview or lower the preview rate when another application has the focus. During streaming video capture, the previewing task is lower priority than writing frames to disk, and preview frames are displayed only if no other buffers are available for writing.