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VFW_S_ESTIMATED
DirectShow returned an estimated value
VFW_S_ESTIMATED is HRESULT 262752 (0x00040260) from Video for Windows. AllStat describes this result as “The value returned had to be estimated; It's accuracy can not be guaranteed.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The requested media value was produced, but the component had to estimate it and cannot guarantee exact accuracy.
Where the result is encountered
- This result can appear in duration, position, bitrate, or timing queries; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- This result can appear in formats without complete indexes; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in live or variable-rate streams; 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
0x00040260immediately 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 caller knows the estimate’s uncertainty and does not use it as an exact edit, billing, or synchronization boundary.
- 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 caller knows the estimate’s uncertainty and does not use it as an exact edit, billing, or synchronization boundary. 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
Display or use the estimate with appropriate tolerance. Re-query after indexing or more data becomes available, and avoid irreversible decisions based solely on the estimate.
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 queried property and time format.
- preserve estimated value.
- preserve source index availability.
- preserve stream duration and bitrate behavior.
- preserve later measured value for comparison.
Also record vfw_s_estimated_operation, vfw_s_estimated_object, vfw_s_estimated_state_before, vfw_s_estimated_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
S_OK can indicate an exact documented result; it explicitly lowers confidence in the returned value.
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
Tests for this HRESULT should verify both the encoded condition and the resulting outputs. A test for this HRESULT that checks only SUCCEEDED cannot detect stale counts, partial streams, adjusted properties, missing callbacks, or other code-specific effects.
A support report for this HRESULT should include decimal 262752, hexadecimal 0x00040260, 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 player estimates duration for a damaged variable-rate file. It shows an approximate timeline, updates it after scanning more samples, and prevents frame-accurate trimming until a reliable index exists.
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
- Microsoft: DirectShow error and success codes
- Microsoft: DirectShow overview
- Microsoft: DirectShow time and clocks
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