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NS_E_EXPECT_MONO_WAV_INPUT
The failing boundary in the Encoder object model
The useful reading of NS_E_EXPECT_MONO_WAV_INPUT (0xC00D1BA1) is not merely the standard message shown above. It locates voice-analysis or optimization input requires a single-channel WAV source inside audio stream and audience settings.
The audio part of an encoder profile combines source format, codec, bitrate mode, average and peak rates, buffer limits and channel layout in a session that returns this result. Multiple audiences impose cross-audience consistency rules in addition to per-field ranges.
Evidence that separates this code from a wrapper error
A codec can be installed and still reject the selected format or bitrate combination; codec presence and profile validity are different tests in a session that returns this result. For example, a stereo music WAV is used as the voice optimization source. 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 | WAVEFORMATEX channels, format tag and file identity |
| Producing object | source WAVEFORMATEX, audience index, audio codec and format indexes, VBR mode, average/peak bitrate, buffer size, channel count, language and compatibility target |
| 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 expect mono wav input boundary |
Interpret the next measurement
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is WAVEFORMATEX channels, format tag and file identity. It confirms voice-analysis or optimization input requires a single-channel WAV source in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the expect mono wav input 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 (voice-analysis or optimization input requires a single-channel WAV source), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: supply a mono WAV with the required codec-compatible format. The original expect mono wav input call should then advance past the same checkpoint. |
The operational impact of it is limited to the audio stream and audience settings transition that owns voice-analysis or optimization input requires a single-channel WAV source. In the representative case where a stereo music WAV is used as the voice optimization source, keep the first failing call and its object identity so a later wrapper cannot replace the expect mono wav input evidence.
Test the condition without rewriting the session
- Record
0xC00D1BA1, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture WAVEFORMATEX channels, format tag and file identity. - verify the audio stream and audience settings precondition without changing the source, profile and output sink at the same time.
- Run one controlled comparison in which only this condition changes: supply a mono WAV with the required codec-compatible format.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier expect mono wav input state.
Interpret neighboring results carefully
| Result | Why it is a different boundary |
|---|---|
NS_E_INPUT_WAVFORMAT_MISMATCH | multiple WAV inputs used together do not share one WAVEFORMATEX |
NS_E_INVALID_VBR_WITH_UNCOMP | VBR mode is combined with an uncompressed audio or video stream |
NS_E_AUDIO_BITRATE_STEPDOWN | audio bitrate ordering is inconsistent with ascending total audience bitrate |
Resolution and verification
The direct repair for this occurrence is to supply a mono WAV with the required codec-compatible format. 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 expect mono wav input checkpoint.
Do not substitute a different codec before saving the exact profile values rejected by validation; otherwise the incompatible combination cannot be identified in a session that returns it.
References for the boundary
- WAVEFORMATEX structure.
- IWMEncProfile2.VBRMode.
- Adding an audience to an encoder profile.
- Choosing an encoding method.
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