HRESULT 0x80040203 (VFW_E_ENUM_OUT_OF_SYNC): meaning and diagnosis

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VFW_E_ENUM_OUT_OF_SYNC means a DirectShow enumerator became stale because its underlying collection changed.

Could be also:
Constant	Type	OS
EVENT_E_QUERYSYNTAX	HRESULT	Windows

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EVENT_E_QUERYSYNTAX	EVENT_E_QUERYFIELD

VFW_E_ENUM_OUT_OF_SYNC

VFW_E_ENUM_OUT_OF_SYNC is a DirectShow HRESULT. A pin or filter enumeration is only valid while the collection being enumerated remains unchanged. Adding, removing or reconnecting filters or pins can make earlier enumeration results stale.

How to recover

Discard objects and indexes obtained from the old enumeration.
Call the enumerator's Reset method or create a new enumerator after the graph change.
Serialize graph mutations and enumeration so that another thread cannot reconfigure the graph in the middle of a scan.

Do not retry the same Next call while keeping old cached positions. Re-enumerate and re-evaluate the current graph topology.

Microsoft: DirectShow error and success codes

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