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MF_E_NO_INDEX
Interpret the result in the pipeline
MF_E_NO_INDEX (0xC00D4656) 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 the operation requires media index data, but the source does not provide a usable index.
The producer is the parser, ASF source, seek or frame lookup operation before sample retrieval, 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 an incompletely finalized ASF file plays sequentially but cannot perform an index-dependent seek.
Checkpoint map
| Checkpoint | Question to answer |
|---|---|
| Input | What exact name, type, index, URL, position, media item, account, device, or setup package reached the parser, ASF source, seek or frame lookup operation before sample retrieval? |
| State | Was the object initialized, connected, started, stopped, committed, authorized, or ready when it evaluated the operation requires media index data, but the source does not provide a usable index? |
| Evidence | index-object presence, index type, stream number, file finalization status, target time, and whether iterative seek is enabled. |
| Completion | Which event, callback, output sample, provider result, or installer action should have followed this result? |
Decisive observations
Collect this result data before automatic retries, Player navigation, device reconnection, source shutdown, or setup rollback destroys it. The minimum useful record contains the exact returning API, object identity, input identity, current lifecycle state, and the first lower-level failure.
A this result trace must not store credentials, license payloads, private keys, authorization headers, or unrelated library contents. Record identifiers, hashes, lengths, status values, and redacted endpoint information sufficient to correlate the event.
Minimal experiment
- Reproduce once with tracing enabled and preserve
0xC00D4656before any fallback. - Verify the decisive observation: index-object presence, index type, stream number, file finalization status, target time, and whether iterative seek is enabled.
- Run the controlled comparison: inspect the file for index objects and compare normal seek with documented iterative seek behavior.
- Return to the result baseline, apply the supported correction, and create a new object generation if the old one entered a terminal state.
- Repeat the result test until the original call advances past this checkpoint and the expected output is validated.
Similar messages, different checkpoints
| HRESULT | Boundary indicated by its standard description |
|---|---|
MF_E_ALREADY_INITIALIZED | This object has already been initialized and cannot be re-initialized at this time; compare this boundary specifically with it. |
MF_E_OFFLINE_MODE | The requested URL is not available in offline mode; compare this boundary specifically with it. |
MF_E_NET_REQUIRE_INPUT | Internal; Entry cannot complete operation without input; compare this boundary specifically with it. |
The codes compared with it can lead to the same user-facing “cannot play,” “operation failed,” or “setup failed” dialog. They remain technically different. Here, MF_E_CANNOT_FIND_KEYFRAME_SAMPLE can occur after an index or scan is available but no clean point is found.
Targeted recovery
For this occurrence, re-index or remux the file, enable supported iterative seeking, or avoid index-dependent operations. Avoid generic cleanup until the original artifact is copied and the producing state is known. A destructive reset during it diagnosis can remove evidence while leaving the actual policy, device, network, format, or lifecycle error unchanged.
Verification of it must use the same input and action that failed. Confirm the expected state transition and check that the workflow does not merely substitute another error after it disappears.
Authoritative references
- Media Foundation architecture — reference used for the checkpoint.
- Media Foundation error codes — reference used for the checkpoint.
- ASF media source — reference used for the checkpoint.
- Sample attributes and clean points — reference used for the checkpoint.
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