IMFVideoMixerControl::SetStreamZOrder method (evr.h)

Articolo
12/05/2018

[The component described on this page, Enhanced Video Renderer, is a legacy feature. It has been superseded by the Simple Video Renderer (SVR) exposed through the MediaPlayer and IMFMediaEngine components. To play video content you should send data into one of these components and allow them to instantiate the new video renderer. These components have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer or the lower level IMFMediaEngine APIs to play video media in Windows instead of the EVR, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Sets the z-order of a video stream.

Syntax

HRESULT SetStreamZOrder(
  [in] DWORD dwStreamID,
  [in] DWORD dwZ
);

Parameters

[in] dwStreamID

Identifier of the stream. For the EVR media sink, the stream identifier is defined when the IMFMediaSink::AddStreamSink method is called. For the DirectShow EVR filter, the stream identifier corresponds to the pin index. The reference stream is always stream 0.

[in] dwZ

Z-order value. The z-order of the reference stream must be zero. The maximum z-order value is the number of streams minus one.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_INVALIDARG	The value of dwZ is larger than the maximum z-order value.
MF_E_INVALIDREQUEST	Invalid z-order for this stream. For the reference stream, dwZ must be zero. For all other streams, dwZ must be greater than zero.
MF_E_INVALIDSTREAMNUMBER	Invalid stream identifier.

Remarks

The EVR draws the video streams in the order of their z-order values, starting with zero. The reference stream must be first in the z-order, and the remaining streams can be in any order.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	evr.h
Library	Strmiids.lib

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