capPreviewRate
The capPreviewRate
macro sets the frame display rate in preview mode. You can use this macro or
explicitly call the WM_CAP_SET_PREVIEWRATE message.
BOOL capPreviewRate(
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hwnd, |
|
|
wMS |
|
|
); |
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Parameters
hwnd
Handle of a
capture window.
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.
See Also