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NS_E_LANGUAGE_MISMATCH
Diagnostic meaning beyond the standard text
For NS_E_LANGUAGE_MISMATCH (0xC00D1B9C), the actionable event is language identifiers differ across audiences for the same source index. Keep the result producing boundary attached to the original Encoder callback or COM call.
Why the session can reach this point
A Windows Media Encoder profile declares content types and one or more audiences in a session that returns this result. Each audience maps source indexes to audio, video, script or file streams and must remain structurally consistent with the other audiences in a multiple-bit-rate profile.
Individual fields may be syntactically valid while the complete profile is inconsistent across audiences or does not match the source group in a session that returns this result. One concrete way to reach the condition is that English and German streams are swapped in only the lowest-bitrate audience. The result test should therefore preserve the object generation and numeric settings, not just a screenshot of the final dialog.
Trace fields with diagnostic value
| Field | What to preserve |
|---|---|
| Decisive values | ordered language tags/LCIDs for the source index in each audience |
| Producing object | profile name and content type, audience count and total bitrate, source indexes, stream types, language identifiers, selected audiences and result of IWMEncProfile2.Validate |
| Session correlation | the same source-group generation, audience index, object identity and callback sequence that produced this result |
| Lower-level evidence | the first COM, driver, file-system or codec HRESULT observed before the Encoder mapped the condition to this result |
| Controlled comparison | a known-good session that changes only the setting named in the language mismatch boundary |
Decision matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is ordered language tags/LCIDs for the source index in each audience. It confirms language identifiers differ across audiences for the same source index in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the language mismatch rule, but a source, driver, COM activation or file operation returns a different HRESULT first. |
| Observation that points to a later failure | The Encoder passes this boundary (language identifiers differ across audiences for the same source index), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: align the language identifiers and order across all audiences. The original language mismatch call should then advance past the same checkpoint. |
The operational impact of it is limited to the profile, audience and stream topology transition that owns language identifiers differ across audiences for the same source index. In the representative case where English and German streams are swapped in only the lowest-bitrate audience, keep the first failing call and its object identity so a later wrapper cannot replace the language mismatch evidence.
Decision path
- Record
0xC00D1B9C, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture ordered language tags/LCIDs for the source index in each audience. - verify the profile, audience and stream topology precondition without changing the source, profile and output sink at the same time.
- Run one controlled comparison in which only this condition changes: align the language identifiers and order across all audiences.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier language mismatch state.
Codes with similar symptoms but different owners
| Result | Why it is a different boundary |
|---|---|
NS_E_NUM_LANGUAGE_MISMATCH | the same source index exposes different language counts across audiences |
NS_E_VBRMODE_MISMATCH | the same source index uses different rate-control modes across audiences |
NS_E_MISSING_SOURCE_INDEX | an audience stream lacks a source index mapping |
Safe recovery
Resolve the producing condition by ensuring that you align the language identifiers and order across all audiences. Then rebuild only the portion of the Encoder graph affected by it and verify the original call.
Do not repair a profile by deleting arbitrary audiences; export the.prx first and compare the same source index across every audience in a session that returns it.
Source material
- Adding an audience to an encoder profile.
- IWMEncAudienceObj.TotalBitrate.
- Retrieving the profile assigned to a source group.
- Detecting profile compatibility.
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