HRESULT 0x8004020F (VFW_E_ALREADY_COMMITTED): meaning and diagnosis

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Description:

The DirectShow allocator cannot change its memory while it is committed.

Could be also:
Constant	Type	OS
EVENT_E_INVALID_EVENT_CLASS_PARTITION	HRESULT	Windows

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EVENT_E_INVALID_EVENT_CLASS_PARTITION	EVENT_E_PER_USER_SID_NOT_LOGGED_ON

VFW_E_ALREADY_COMMITTED

VFW_E_ALREADY_COMMITTED is a DirectShow HRESULT. A committed allocator owns active buffer memory for streaming. Changing its properties while it is committed can invalidate samples held by connected filters, so DirectShow rejects the operation.

Correct sequence

Stop or deactivate the affected connection before changing allocator properties.
Call IMemAllocator::Decommit and make sure outstanding samples are released.
Set the new properties and call Commit again before resuming delivery.

If decommit cannot finish, look for filters or application code that still retains IMediaSample references.

Microsoft: DirectShow media samples and allocators

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