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Marks a point in the stream. This message applies only to Asynchronous MFTs.

Message Parameter

An arbitrary value. The MFT returns the value to the client in the METransformMarker event.


To send this message, call IMFTransform::ProcessMessage.

The MFT responds to this messageas follows:

  1. The MFT generates as many output samples as it can from the existing input data, sending an METransformHaveOutput event for each output sample.
  2. After all of the output is generated, the MFT sends an METransformMarker event. This event must be sent after all of the METransformHaveOutput events.

The client is not required to send this message, and should send this message only to asynchronous MFTs. A synchronous MFT will not send an METransformMarker event in response to this message.


Asynchronous MFTs must respond to this message as described. Synchronous MFTs should ignore this message.


Minimum supported client

Windows 7 [desktop apps only]

Minimum supported server

Windows Server 2008 R2 [desktop apps only]



See also




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