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NS_E_NO_MEDIAFORMAT_IN_SOURCE
Diagnostic meaning beyond the standard text
For NS_E_NO_MEDIAFORMAT_IN_SOURCE (0xC00D1B6F), the actionable event is preparation of a source whose plug-in has not exposed a media format. 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 custom source plug-in is instantiated but never receives its input URL. 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 | source input, plug-in object, GetInput result and negotiated major/subtype before PrepareToEncode |
| 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 no mediaformat in source boundary |
Decision matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is source input, plug-in object, GetInput result and negotiated major/subtype before PrepareToEncode. It confirms preparation of a source whose plug-in has not exposed a media format in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the no mediaformat in source 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 (preparation of a source whose plug-in has not exposed a media format), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: complete source configuration and force format discovery before preparing the group. The original no mediaformat in source 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 preparation of a source whose plug-in has not exposed a media format. In the representative case where a custom source plug-in is instantiated but never receives its input URL, keep the first failing call and its object identity so a later wrapper cannot replace the no mediaformat in source evidence.
Decision path
- Record
0xC00D1B6F, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture source input, plug-in object, GetInput result and negotiated major/subtype before PrepareToEncode. - 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: complete source configuration and force format discovery before preparing the group.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier no mediaformat in source state.
Codes with similar symptoms but different owners
| Result | Why it is a different boundary |
|---|---|
NS_E_NO_PROFILE_IN_SOURCEGROUP | preparation of a source group that has no IWMEncProfile assignment |
NS_E_NO_VALID_OUTPUT_STREAM | mapping source media to at least one output stream declared by the profile |
NS_E_MISMATCHED_MEDIACONTENT | comparison of source-group media content with the assigned profile content type |
Safe recovery
Resolve the producing condition by ensuring that you complete source configuration and force format discovery before preparing the group. 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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