IFilterGraph::SetDefaultSyncSource method (strmif.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 SetDefaultSyncSource method sets the reference clock to the default clock.

Syntax

HRESULT SetDefaultSyncSource();

Return value

Returns an HRESULT value. Possible values include the following:

Return code	Description
S_OK	Success.
VFW_E_NOT_STOPPED	The filter graph is not stopped.

Remarks

This method instructs the Filter Graph Manager to choose a reference clock using its default algorithm. For more information about the algorithm that it uses, see Reference Clocks.

Usually you do not need to call this method, because the Filter Graph Manager automatically selects a clock. However, if you call IMediaFilter::SetSyncSource to override the clock, you can use SetDefaultSyncSource to restore the default clock.

This method fails if the filter graph is running or paused.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	strmif.h (include Dshow.h)
Library	Strmiids.lib

See also

Error and Success Codes

IFilterGraph Interface

Time and Clocks in DirectShow