HRESULT 0x80040226 (VFW_E_NOT_RUNNING): meaning and diagnosis

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The requested DirectShow operation requires a running filter or graph.

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VFW_E_NOT_PAUSED	VFW_E_WRONG_STATE

VFW_E_NOT_RUNNING

VFW_E_NOT_RUNNING is a DirectShow HRESULT. The requested operation depends on active streaming or a running reference clock, but the filter graph is stopped or paused. It commonly occurs when application code begins a stream-dependent action before Run has completed.

How to handle it

Start the graph with IMediaControl::Run and wait for the expected state or event.
Ensure that the required source, renderer and reference clock are present before starting.
Protect against races between worker threads that stop the graph and code that issues stream-dependent calls.

If the operation should work while paused, inspect the specific filter implementation; some state requirements are filter-specific.

Microsoft: DirectShow filter states

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