IVideoProcAmp::get_PowerlineFrequency method (vidcap.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The get_PowerlineFrequency method returns the camera's power line frequency setting. This setting enables the camera to perform anti-flicker processing.
Syntax
HRESULT get_PowerlineFrequency(
[out] long *pValue,
[out] long *pFlags
);
Parameters
[out] pValue
Receives one of the following values.
| Value | Description |
|---|---|
| 0 | Disabled. |
| 1 | 50 Hz. |
| 2 | 60 Hz. |
[out] pFlags
Receives one or more flags. See VideoProcAmpFlags.
Return value
Returns an HRESULT value.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP with SP2 [desktop apps only] |
| Minimum supported server | Windows Server 2003 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | vidcap.h |