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MF_E_INVALIDINDEX
Locate the failing boundary
MF_E_INVALIDINDEX (0xC00D36BF) is a failure result from Windows Media Foundation. The generated section above already contains the platform message; the useful extra information is that this result isolates an index is outside the collection, stream, type, or attribute range exposed by the object.
The producer is the collection-style method that validates the numeric index, so diagnosis should begin with that object and its state rather than with a broad reinstall or an unrelated codec change. A representative occurrence is a client caches a stream count, the source changes presentation, and a later call reuses an index that no longer exists.
Read the call sequence as a timeline. First, the application reaches the collection-style method that validates the numeric index. Next, the component evaluates an index is outside the collection, stream, type, or attribute range exposed by the object. Only after the MF_E_INVALIDINDEX checkpoint can a wrapper, user interface, or fallback path emit a less specific message.
Evidence that survives retries
- Exact request: method name, all identifiers, units, flags, stream number, requested action, and
MF_E_INVALIDINDEX. - Object state: the requested index, current count, stream selection, object generation, and whether the collection changed asynchronously.
- Correlation for
MF_E_INVALIDINDEX: callback cookie, object generation, URL or file identity, device identity, and timestamps from the same attempt. - Underlying cause: the first Win32, COM, network, driver, policy, or component error reported before
0xC00D36BF.
A controlled verification sequence
Use one controlled experiment: query the current count and retry the last valid index without reusing a stale enumeration result. A useful MF_E_INVALIDINDEX comparison changes exactly that variable; changing content, account, proxy, device, components, and version together makes attribution impossible.
| Outcome | Interpretation |
|---|---|
| The same checkpoint now succeeds | The changed condition belongs to the producing boundary for MF_E_INVALIDINDEX. |
| A more specific earlier HRESULT appears | Preserve it; MF_E_INVALIDINDEX was probably a wrapper or terminal state. |
| The operation advances and fails later | The MF_E_INVALIDINDEX condition is fixed even though the complete workflow still has another defect. |
| No behavior changes | Restore the MF_E_INVALIDINDEX baseline and test another documented prerequisite instead of stacking workarounds. |
Nearby results that mean something else
| Related code | Why it is not interchangeable |
|---|---|
MF_E_INVALIDTYPE | Invalid type; compare this boundary specifically with MF_E_INVALIDINDEX. |
MF_E_INVALIDNAME | Invalid name; compare this boundary specifically with MF_E_INVALIDINDEX. |
MF_E_UNEXPECTED | An unexpected error has occurred in the operation requested; compare this boundary specifically with MF_E_INVALIDINDEX. |
The important distinction is this: MF_E_NOT_FOUND can occur when a valid key has no object, whereas this code rejects the numeric position itself. For MF_E_INVALIDINDEX, searching only for the visible English message collapses different states; the constant and 0xC00D36BF retain the boundary.
Repair at the owning layer
Apply the narrow remedy: refresh the collection and use an index below the current count; stable IDs are preferable across asynchronous changes. Then discard stale media objects, pending callbacks, cached provider sessions, or installer state as appropriate and rerun the exact request that originally returned MF_E_INVALIDINDEX.
A confirmed MF_E_INVALIDINDEX repair produces the requested stream, attribute, state transition, license decision, store callback, or setup result. Suppressing MF_E_INVALIDINDEX, broadly enabling legacy controls, or falling back to unrelated content is not proof of repair.
References
- Media Foundation architecture — reference used for the
MF_E_INVALIDINDEXcheckpoint. - Media Foundation error codes — reference used for the
MF_E_INVALIDINDEXcheckpoint. - Media sources — reference used for the
MF_E_INVALIDINDEXcheckpoint. - Media Foundation events — reference used for the
MF_E_INVALIDINDEXcheckpoint.
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