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Notifies a Media Foundation transform (MFT) that the first sample is about to be processed.
Message Parameter
None.
Remarks
To send this message, call IMFTransform::ProcessMessage.
For synchronous MFTs, it is optional to send this message.
For asynchronous MFTs, the client must send this message.
Implementation
A synchronous MFT is not required to respond to the message.
An asynchronous MFT must implement this message, as described in Asynchronous MFTs.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
|
See also