What does HRESULT 0xC00D1B9C (NS_E_LANGUAGE_MISMATCH) mean?

Status / error code:

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Description:

The same source index in different audiences should have the same languages.%0

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NS_E_NUM_LANGUAGE_MISMATCH	NS_E_VBRMODE_MISMATCH

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.

Why the session can reach this point

Individual fields may be syntactically valid while the complete profile is inconsistent across audiences or does not match the source group. One concrete way to reach the condition is that English and German streams are swapped in only the lowest-bitrate audience.

Decision path

Record 0xC00D1B9C, the Encoder version and the exact API call or property access that returned it.
Export the current .wme or .prx configuration, 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 that changes only the identified precondition: align the language identifiers and order across all audiences.

Codes with similar symptoms but different owners

Result	Why it differs
`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

Align the language identifiers and order across all audiences.

Do not repair a profile by deleting arbitrary audiences; export the .prx profile first and compare the same source index across every audience.

Source material

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