IMFPMediaPlayer::SetAspectRatioMode method (mfplay.h)
[The feature associated with this page, MFPlay, is a legacy feature. It has been superseded by MediaPlayer and IMFMediaEngine. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer and IMFMediaEngine instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Specifies whether the aspect ratio of the video is preserved during playback.
Syntax
HRESULT SetAspectRatioMode(
[in] DWORD dwAspectRatioMode
);
Parameters
[in] dwAspectRatioMode
Bitwise OR of one or more flags from the MFVideoAspectRatioMode enumeration.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
|
The current media item does not contain video. |
|
The object's Shutdown method was called. |
Remarks
This method fails if no media item is currently set, or if the current media item does not contain video.
To set the aspect-ratio mode before playback starts, call this method inside your event handler for the MFP_EVENT_TYPE_MEDIAITEM_SET event. For more information, see IMFPMediaPlayerCallback::OnMediaPlayerEvent.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 7 [desktop apps only] |
| Minimum supported server | Windows Server 2008 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | mfplay.h |