METransformHaveOutput event

Sent by an asynchronous Media Foundation transform (MFT) when new output data is available from the MFT.

Event values

Possible values retrieved from IMFMediaEvent::GetValue include the following.

VARTYPE Description
No event data.


No attributes are defined for this event.


Asynchronous MFTs send this event through the IMFMediaEventGenerator interface. Synchronous MFTs never send this event.

When the client of the MFT receives this event, it should call IMFTransform::ProcessOutput to get the output.


Requirement Value
Minimum supported client
Windows 7 [desktop apps only]
Minimum supported server
Windows Server 2008 R2 [desktop apps only]
Mfobjects.h (include Mfidl.h)

See also

Media Foundation Events

Asynchronous MFTs