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VFW_E_TIMEOUT
Meaning
Windows documents VFW_E_TIMEOUT as “A time-out has expired”. In practical terms, it is returned when a DirectShow operation does not complete within the time allowed by the component or caller.
Where the failure belongs
This result belongs to DirectShow filter-graph processing. The relevant condition is that a DirectShow operation does not complete within the time allowed by the component or caller.
Likely causes
- Possible cause 1: a filter state transition waits on blocked streaming work.
- Possible cause 2: a device or network source stops responding.
- Possible cause 3: a callback or graph lock creates a deadlock-like stall.
Evidence to collect
- Capture 1: operation start, deadline and elapsed time.
- Capture 2: thread wait chains and graph state.
- Capture 3: device, source and callback activity during the interval.
Diagnostic sequence
- Confirm that the observed path matches this condition: a DirectShow operation does not complete within the time allowed by the component or caller.
Correct handling and retry
- Corrective action 1: identify and unblock the specific wait rather than merely increasing every timeout.
- Corrective action 2: cancel or flush operations through supported interfaces.
- Corrective action 3: separate slow external I/O from graph-control locks.
Retry guidance. Retry with bounded backoff only when the timed operation is idempotent and previous completion is known; otherwise rebuild the affected graph branch.
Practical scenario
A source filter holds a graph lock while waiting for network data and prevents Stop from completing; releasing the lock around I/O removes it.
Difference from nearby HRESULTs
VFW_E_STATE_CHANGED reports a control transition during a wait, while it reports that the expected completion did not arrive before the deadline.
Official Microsoft references
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