IMFTransform::DeleteInputStream method (mftransform.h)

Removes an input stream from this Media Foundation transform (MFT).


HRESULT DeleteInputStream(
  DWORD dwStreamID



Identifier of the input stream to remove.

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 transform has a fixed number of input streams.
The stream is not removable, or the transform currently has the minimum number of input streams it can support.
Invalid stream identifier.
The transform has unprocessed input buffers for the specified stream.


If the transform has a fixed number of input streams, the method returns E_NOTIMPL.

An MFT might support this method but not allow certain input streams to be removed. If an input stream can be removed, the IMFTransform::GetInputStreamInfo method returns the MFT_INPUT_STREAM_REMOVABLE flag for that stream. Otherwise, the stream cannot be removed, and the method returns MF_E_INVALIDREQUEST. The method also fails if the MFT currently has the minimum number of input streams that it requires. To find the minimum number of streams, call IMFTransform::GetStreamLimits.

If the transform still has unprocessed input for that stream, the method might succeed or it might return MF_E_TRANSFORM_INPUT_REMAINING. If the method succeeds, the MFT will continue to process the remaining input after the stream is removed. If the method returns MF_E_TRANSFORM_INPUT_REMAINING, you must clear the input buffers before removing the stream. To clear the input buffers, either call IMFTransform::ProcessOutput or else call IMFTransform::ProcessMessage with the MFT_MESSAGE_COMMAND_FLUSH to flush the MFT. Then call the DeleteInputStream again. An MFT should never discard input buffers when DeleteInputStream is called.

If MFT_UNIQUE_METHOD_NAMES is defined before including mftransform.h, this method is renamed MFTDeleteInputStream. See Creating Hybrid DMO/MFT Objects.


Minimum supported client Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header mftransform.h
Library Mfuuid.lib

See also


Media Foundation Transforms