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NS_E_UNCOMP_COMP_COMBINATION
Where the Encoder produces this result
0xC00D1BB6 (NS_E_UNCOMP_COMP_COMBINATION) identifies one session mixes compressed and uncompressed streams in an unsupported profile combination. The important diagnostic boundary is the Encoder object that validates this state; a later “cannot start encoding” dialog can hide that more precise origin.
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.
What has already succeeded
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. In a representative uncomp comp combination case, one audience uses uncompressed video while the others use Windows Media Video. The result observation should be tested at the producing object instead of being treated as a general codec or operating-system failure.
State snapshot to capture
| Field | What to preserve |
|---|---|
| Decisive values | codec/compression state for every stream and 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 uncomp comp combination boundary |
How to read the next observation
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is codec/compression state for every stream and audience. It confirms one session mixes compressed and uncompressed streams in an unsupported profile combination in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the uncomp comp combination 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 (one session mixes compressed and uncompressed streams in an unsupported profile combination), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: make the session consistently compressed or uncompressed as required. The original uncomp comp combination 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 one session mixes compressed and uncompressed streams in an unsupported profile combination. In the representative case where one audience uses uncompressed video while the others use Windows Media Video, keep the first failing call and its object identity so a later wrapper cannot replace the uncomp comp combination evidence.
A controlled diagnostic sequence
- Record
0xC00D1BB6, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture codec/compression state for every stream and 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: make the session consistently compressed or uncompressed as required.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier uncomp comp combination state.
Nearby HRESULTs that mean something else
| Result | Why it is a different boundary |
|---|---|
NS_E_MULTIPLE_VBR_AUDIENCES | multiple-bit-rate audiences are combined with a VBR profile mode not supported by that topology |
NS_E_MULTIPLE_AUDIO_CODECS | audiences choose different audio codecs for the same audio source |
NS_E_NO_PROFILE_NAME | saving or validating a custom profile without a profile name |
Corrective action at the right layer
The focused correction is to make the session consistently compressed or uncompressed as required. A retry is useful only after the recorded uncomp comp combination precondition changes.
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.
Technical references
- Adding an audience to an encoder profile.
- IWMEncAudienceObj.TotalBitrate.
- Retrieving the profile assigned to a source group.
- Detecting profile compatibility.
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