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NS_E_INVALID_AUDIO_BUFFERMAX
Diagnostic meaning beyond the standard text
For NS_E_INVALID_AUDIO_BUFFERMAX (0xC00D1BBC), the actionable event is maximum audio buffer setting is outside the accepted range or unit. Keep the result producing boundary attached to the original Encoder callback or COM call.
Why the session can reach this point
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.
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. One concrete way to reach the condition is that milliseconds are supplied to a field populated from bytes in a custom profile tool. 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 | audio buffer value, units, codec and audience bitrate |
| 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 invalid audio buffermax boundary |
Decision matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is audio buffer value, units, codec and audience bitrate. It confirms maximum audio buffer setting is outside the accepted range or unit in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the invalid audio buffermax 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 (maximum audio buffer setting is outside the accepted range or unit), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: set a supported buffer duration/size using the API's expected units. The original invalid audio buffermax 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 maximum audio buffer setting is outside the accepted range or unit. In the representative case where milliseconds are supplied to a field populated from bytes in a custom profile tool, keep the first failing call and its object identity so a later wrapper cannot replace the invalid audio buffermax evidence.
Decision path
- Record
0xC00D1BBC, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture audio buffer value, units, codec and audience bitrate. - 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: set a supported buffer duration/size using the API's expected units.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier invalid audio buffermax state.
Codes with similar symptoms but different owners
| Result | Why it is a different boundary |
|---|---|
NS_E_INVALID_AUDIO_PEAKRATE_2 | audio peak bitrate does not exceed the configured average bitrate when constrained VBR requires it |
NS_E_INVALID_FOLDDOWN_COEFFICIENTS | multichannel fold-down coefficients fall outside the accepted dB interval |
NS_E_INVALID_AUDIO_PEAKRATE | audio peak bitrate is outside the codec or mode's valid range |
Safe recovery
Resolve the producing condition by ensuring that you set a supported buffer duration/size using the API's expected units. Then rebuild only the portion of the Encoder graph affected by it and verify the original call.
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.
Source material
- WAVEFORMATEX structure.
- IWMEncProfile2.VBRMode.
- Adding an audience to an encoder profile.
- Choosing an encoding method.
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