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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.

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

See also

IVMRImagePresenter9 Interface

StopPresenting

Using the Video Mixing Renderer