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NS_E_MISSING_SOURCE_INDEX
Diagnostic meaning beyond the standard text
For NS_E_MISSING_SOURCE_INDEX (0xC00D1B9A), the actionable event is an audience stream lacks a source index mapping.
Why the session can reach this point
A Windows Media Encoder profile declares content types and one or more audiences. 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. One concrete way to reach the condition is that a manually edited.prx contains a video stream node without its source index.
Decision path
- Record
0xC00D1B9A, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture audience and stream type, source index property and available source streams. - 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: assign the stream to a valid source index consistently across audiences.
Codes with similar symptoms but different owners
| Result | Why it differs |
|---|---|
NS_E_AUDIENCE_CONTENTTYPE_MISMATCH | audiences in one output tree declare different overall media content types |
NS_E_NUM_LANGUAGE_MISMATCH | the same source index exposes different language counts across audiences |
NS_E_MISSING_AUDIENCE | an output-tree reference points to an audience that is absent |
Safe recovery
Assign the stream to a valid source index consistently across audiences.
Do not repair a profile by deleting arbitrary audiences; export the .prx profile first and compare the same source index across every audience.
Discriminating evidence: Map every audience stream back to its source-group index and identify the first reference to an index that is absent. The critical artifact is the missing source mapping, not the stream's bitrate, pixel mode, quality setting, or codec choice.
Source material
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