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
wParam = (WPARAM) (wMS);
lParam = 0L;
Rate, in milliseconds, at which new frames are captured and displayed.
Returns TRUE if successful or FALSE if the capture window is not connected to
a capture driver.
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.
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