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The transform can optionally implement the IControlOutputSize interface to enable it to change its output buffer requirements before each call to IMediaTransform::Process is processed. This allows Windows Movie Maker to allot the minimal buffer space that is required for a transition or effect that requires a varying screen size at different times (for example, when rotating a rectangular image).
In addition to the methods inherited from IUnknown, the IControlOutputSize interface exposes the following method.
| Method | Description |
| GetOutputSize | Gets the output buffer size that Windows Movie Maker intends to allocate for the next call to IMediaTransform::Process. |
See Also