What does HRESULT 0x80040214 (VFW_E_NO_SINK) mean?

VFW_E_NO_SINK

Meaning

Windows documents VFW_E_NO_SINK as “Quality messages could not be sent because no quality sink has been defined”. In practical terms, it is returned when a DirectShow filter attempts to send a quality-control notification but no quality sink is configured.

Likely causes

• Possible cause 1: the downstream renderer does not expose or set a quality sink.
• Possible cause 2: a filter clears the sink during reconnection but continues reporting.
• Possible cause 3: custom quality-control code assumes every graph branch accepts notifications.

Evidence to collect

• Capture 1: IQualityControl::SetSink calls and selected sink identity.
• Capture 2: graph branch, renderer and quality message contents.
• Capture 3: reconnection or shutdown events that changed the sink.

Correct handling and retry

• Corrective action 1: treat absence of a quality sink according to the filter contract.
• Corrective action 2: set the intended sink during graph connection.
• Corrective action 3: stop sending notifications after disconnection or teardown.

Retry guidance. Retry after a sink is configured; do not flood the graph with identical quality messages when none can receive them.

Practical scenario

A transform retains its quality-report timer after the renderer is removed; clearing the timer with the sink prevents it.

Difference from nearby HRESULTs

VFW_E_NO_INTERFACE means a required COM interface is absent generally; it specifically concerns the quality-control notification destination.

Official Microsoft references

• Microsoft: DirectShow error and success codes
• Microsoft: DirectShow quality control
• Microsoft: DirectShow filters and pins