HRESULT 0x80040219 (VFW_E_CHANGING_FORMAT): meaning and diagnosis

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The DirectShow connection could not change its media type while streaming.

Could be also:
Constant	Type	OS
TPC_E_INVALID_INPUT_RECT	HRESULT	Windows

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TPC_E_INVALID_INPUT_RECT	VFW_E_NO_COLOR_KEY_SET

VFW_E_CHANGING_FORMAT

VFW_E_CHANGING_FORMAT is a DirectShow HRESULT. A filter attempted to alter the media type after streaming had begun, but the connected filters or current graph state do not permit that change. Some filters support in-stream format changes; others require a stopped and reconnected graph.

How to handle it

Use QueryAccept to determine whether the downstream pin accepts the proposed type.
When a format change is not supported in-stream, stop the affected graph branch, disconnect it and renegotiate the connection.
If a new type is attached to a sample, ensure the downstream filter follows the expected dynamic media-type handling path.

Treat format changes as a graph-protocol event. Updating only the source filter's local media type is not enough.

Microsoft: DirectShow media-type changes

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