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NS_E_NOSOURCEGROUPS
Diagnostic meaning beyond the standard text
For NS_E_NOSOURCEGROUPS (0xC00D1B80), the actionable event is starting an Encoder session with an empty source-group collection. Keep the result producing boundary attached to the original Encoder callback or COM call.
Why the session can reach this point
The Encoder object model groups audio, video and script inputs in an IWMEncSourceGroup, associates one profile with that group, and asks a source plug-in to expose a media format that can feed the selected output streams in a session that returns this result.
Successful creation of the COM objects does not prove that the source group is complete; profile assignment, source discovery and format negotiation are later checkpoints in a session that returns this result. One concrete way to reach the condition is that a.wme load failure is ignored and Start is called on a new empty Encoder object. The result test should therefore preserve the object generation and numeric settings, not just a screenshot of the final dialog.
Trace fields with diagnostic value
| Field | What to preserve |
|---|---|
| Decisive values | SourceGroupCollection.Count, configuration-load result and any failed Add calls |
| Producing object | source-group collection index and name, active/prepared state, stream type, input scheme and stream name, source plug-in CLSID, negotiated media type and assigned profile |
| 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 nosourcegroups boundary |
Decision matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is SourceGroupCollection.Count, configuration-load result and any failed Add calls. It confirms starting an Encoder session with an empty source-group collection in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the nosourcegroups 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 (starting an Encoder session with an empty source-group collection), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: add at least one complete source group with sources and a profile. The original nosourcegroups call should then advance past the same checkpoint. |
The operational impact of it is limited to the source groups, streams and plug-ins transition that owns starting an Encoder session with an empty source-group collection. In the representative case where a.wme load failure is ignored and Start is called on a new empty Encoder object, keep the first failing call and its object identity so a later wrapper cannot replace the nosourcegroups evidence.
Decision path
- Record
0xC00D1B80, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture SourceGroupCollection. - verify the source groups, streams and plug-ins precondition without changing the source, profile and output sink at the same time.
- Run one controlled comparison in which only this condition changes: add at least one complete source group with sources and a profile.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier nosourcegroups state.
Codes with similar symptoms but different owners
| Result | Why it is a different boundary |
|---|---|
NS_E_NO_SCRIPT_STREAM | submission of script data when the current source group has no script source |
NS_E_SOURCE_NOTSPECIFIED | final source-group validation finds an incompletely configured source |
NS_E_NO_VALID_OUTPUT_STREAM | mapping source media to at least one output stream declared by the profile |
Safe recovery
Resolve the producing condition by ensuring that you add at least one complete source group with sources and a profile. Then rebuild only the portion of the Encoder graph affected by it and verify the original call.
Do not delete and recreate every source group before exporting the.wme configuration and recording the active group; otherwise the failing object relation is lost in a session that returns it.
Source material
- Preparing a source group for encoding.
- Retrieving the profile assigned to a source group.
- Retrieving the configured encoder input.
- Saving a Windows Media Encoder configuration.
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