IVMRWindowlessControl::SetAspectRatioMode 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 SetAspectRatioMode method specifies whether the VMR will preserve the aspect ratio of the source video.

Syntax

HRESULT SetAspectRatioMode(
  [in] DWORD AspectRatioMode
);

Parameters

[in] AspectRatioMode

Specifies a member of the VMR_ASPECT_RATIO_MODE enumeration type.

Return value

Returns an HRESULT value. Possible values include the following:

Return code Description
E_INVALIDARG
Invalid argument
S_OK
Success
VFW_E_WRONG_STATE
The VMR is not in windowless mode.

Requirements

Requirement Value
Minimum supported client Windows XP with SP1 [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IVMRWindowlessControl Interface

IVMRWindowlessControl::GetAspectRatioMode

Using the Video Mixing Renderer