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NS_E_MULTIPLE_AUDIO_CODECS
The failing boundary in the Encoder object model
The useful reading of NS_E_MULTIPLE_AUDIO_CODECS (0xC00D1BB7) is not merely the standard message shown above. It locates audiences choose different audio codecs for the same audio source inside profile, audience and stream topology.
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.
Evidence that separates this code from a wrapper error
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. For example, low bitrate uses the voice codec while high bitrate uses Windows Media Audio. Preserve the result distinction before a UI layer converts the result into a broad start, capture or profile failure.
| Field | What to preserve |
|---|---|
| Decisive values | audio codec identity/index per 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 multiple audio codecs boundary |
Interpret the next measurement
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is audio codec identity/index per audience. It confirms audiences choose different audio codecs for the same audio source in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the multiple audio codecs 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 (audiences choose different audio codecs for the same audio source), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: select the same audio codec across all audiences. The original multiple audio codecs 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 audiences choose different audio codecs for the same audio source. In the representative case where low bitrate uses the voice codec while high bitrate uses Windows Media Audio, keep the first failing call and its object identity so a later wrapper cannot replace the multiple audio codecs evidence.
Test the condition without rewriting the session
- Record
0xC00D1BB7, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture audio codec identity/index per 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: select the same audio codec across all audiences.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier multiple audio codecs state.
Interpret neighboring results carefully
| Result | Why it is a different boundary |
|---|---|
NS_E_UNCOMP_COMP_COMBINATION | one session mixes compressed and uncompressed streams in an unsupported profile combination |
NS_E_MULTIPLE_VIDEO_CODECS | audiences choose different video codecs for the same source |
NS_E_MULTIPLE_VBR_AUDIENCES | multiple-bit-rate audiences are combined with a VBR profile mode not supported by that topology |
Resolution and verification
The direct repair for this occurrence is to select the same audio codec across all audiences. Recreate the affected source group, profile or output object, repeat the same operation, and confirm that the first failing HRESULT no longer comes from the multiple audio codecs checkpoint.
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.
References for the boundary
- Adding an audience to an encoder profile.
- IWMEncAudienceObj.TotalBitrate.
- Retrieving the profile assigned to a source group.
- Detecting profile compatibility.
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