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NS_E_MISSING_AUDIENCE
How to interpret the code in a real encoding session
0xC00D1B98 is named NS_E_MISSING_AUDIENCE. Its practical scope is an output-tree reference points to an audience that is absent, which belongs to profile, audience and stream topology rather than to every part of Windows Media playback or Windows itself.
Mechanism and point of failure
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. A typical reproduction is: profile editing removes an audience but leaves a child stream node pointing to it. This makes the first result from the Encoder more valuable than a later generic message.
Reproduction matrix
| Field | What to preserve |
|---|---|
| Decisive values | audience indexes, output-tree nodes and AudienceCount before profile validation |
| 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 missing audience boundary |
Evidence matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is audience indexes, output-tree nodes and AudienceCount before profile validation. It confirms an output-tree reference points to an audience that is absent in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the missing audience 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 (an output-tree reference points to an audience that is absent), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: restore the referenced audience or repair the index mapping. The original missing audience 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 an output-tree reference points to an audience that is absent. In the representative case where profile editing removes an audience but leaves a child stream node pointing to it, keep the first failing call and its object identity so a later wrapper cannot replace the missing audience evidence.
Minimal experiment
- Record
0xC00D1B98, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture audience indexes, output-tree nodes and AudienceCount before profile validation. - 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: restore the referenced audience or repair the index mapping.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier missing audience state.
Do not collapse these results together
| Result | Why it is a different boundary |
|---|---|
NS_E_PROFILE_MISMATCH | switching or combining sources whose assigned profiles are not equivalent for the session |
NS_E_AUDIENCE_CONTENTTYPE_MISMATCH | audiences in one output tree declare different overall media content types |
NS_E_MISSING_SOURCE_INDEX | an audience stream lacks a source index mapping |
What to change—and what to leave alone
Change the smallest responsible precondition: restore the referenced audience or repair the index mapping. While retesting it, keep all unrelated source, audience and output values fixed until the same call is repeated.
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.
Authoritative documentation
- Adding an audience to an encoder profile.
- IWMEncAudienceObj.TotalBitrate.
- Retrieving the profile assigned to a source group.
- Detecting profile compatibility.
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