IVMRImagePresenter9::StartPresenting method (vmr9.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 StartPresenting method is called just before the video starts playing. The allocator-presenter should perform any necessary configuration in this method.
Syntax
HRESULT StartPresenting(
[in] DWORD_PTR dwUserID
);
Parameters
[in] dwUserID
An application-defined DWORD_PTR cookie that uniquely identifies this instance of the VMR for use in scenarios when one instance of the allocator-presenter is used with multiple VMR instances.
Return value
The method returns an HRESULT. Possible values include those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
Remarks
PresentImage can be called when the filter is in either a running or a paused state. StartPresenting and StopPresenting can be called only in a running state. Therefore, if the graph is paused before it is run, PresentImage will be called before StartPresenting.
Include DShow.h and D3d9.h before Vmr9.h.
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 | vmr9.h |
| Library | Strmiids.lib |