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VFW_S_RESERVED
Reserved ActiveMovie success code observed
VFW_S_RESERVED is HRESULT 262755 (0x00040263) from Video for Windows. AllStat describes this result as “This success code is reserved for internal purposes within ActiveMovie.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The component returned a success value reserved for internal ActiveMovie purposes, so public application logic should not assign undocumented semantics to it.
Where the result is encountered
- This result can appear in legacy filters or wrappers exposing internal statuses; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- This result can appear in diagnostic logs from old ActiveMovie components; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in compatibility testing across DirectShow versions; record the producing interface and method rather than inferring behavior from the symbolic name alone.
The same numeric success value can be mishandled when a wrapper exposes only a Boolean. Keep the original HRESULT until the code-specific outputs and state transition have been evaluated.
Diagnostic sequence
- capture the raw HRESULT
0x00040263immediately after the returning method and record whether the caller usedSUCCEEDED,FAILED, equality testing, or exception translation. - Identify the exact owner of it: interface, method, object instance, provider or filter version, thread or apartment, and operation phase.
- Validate the decisive contract boundary for this HRESULT: the operation’s actual postcondition is established from outputs and component documentation rather than guessed from the symbolic name.
- inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result.
- Compare the observed state before and after it; do not assume that a success severity bit means every optional sub-operation completed.
- reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.
State boundary that must be proved
The central question for this HRESULT is whether the operation’s actual postcondition is established from outputs and component documentation rather than guessed from the symbolic name. The HRESULT alone confirms neither unrelated work nor the quality of optional outputs.
A reliable interpretation of it names the exact method contract, the object generation, and the outputs that remain valid. This prevents a success-with-information result from being promoted to full success or demoted to a generic error.
Correct handling, retry, and recovery
Treat it as successful only according to HRESULT severity, then validate outputs. Do not create application behavior that depends on an undocumented internal meaning.
Retry it only when the recorded state can change the documented outcome. Repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.
Evidence and telemetry to preserve
- preserve producing CLSID and module version.
- preserve method name and inputs.
- preserve all output parameters.
- preserve graph state before and after.
- preserve whether the value crosses a public API boundary.
Also record vfw_s_reserved_operation, vfw_s_reserved_object, vfw_s_reserved_state_before, vfw_s_reserved_state_after, UTC time, process and thread identifiers, and a correlation ID. Keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.
Difference from nearby HRESULT values
Named VFW_S_* statuses provide a documented condition; it intentionally does not provide a public condition.
This distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.
Developer and administrator guidance
Application telemetry should separate terminal failure, ordinary success, partial completion, continuation, cancellation, and warning-like success. Support bundles should contain the smallest reproducible call and the effective configuration seen by the owning component.
A support report for this HRESULT should include decimal 262755, hexadecimal 0x00040263, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.
Practical validation scenario
A third-party filter logs it after a connection call. The host records the filter version and validates the connected pins, but does not map the value to retry, warning, or resource cleanup without vendor documentation.
The negative test should preserve the condition that produces it; the recovery test should alter only that condition and verify the final state as well as the HRESULT.
References
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