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NS_E_INVALID_FOLDDOWN_COEFFICIENTS
The failing boundary in the Encoder object model
The useful reading of NS_E_INVALID_FOLDDOWN_COEFFICIENTS (0xC00D1BD4) is not merely the standard message shown above. It locates multichannel fold-down coefficients fall outside the accepted dB interval 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, linear gain values are written directly to a field expecting decibels. 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 | every coefficient in dB, channel mapping and source layout |
| 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 folddown coefficients boundary |
Interpret the next measurement
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is every coefficient in dB, channel mapping and source layout. It confirms multichannel fold-down coefficients fall outside the accepted dB interval in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the invalid folddown coefficients 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 (multichannel fold-down coefficients fall outside the accepted dB interval), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: clamp or recalculate coefficients within -144 through 0 dB while preserving channel intent. The original invalid folddown coefficients 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 multichannel fold-down coefficients fall outside the accepted dB interval. In the representative case where linear gain values are written directly to a field expecting decibels, keep the first failing call and its object identity so a later wrapper cannot replace the invalid folddown coefficients evidence.
Test the condition without rewriting the session
- Record
0xC00D1BD4, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture every coefficient in dB, channel mapping and source layout. - 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: clamp or recalculate coefficients within -144 through 0 dB while preserving channel intent.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier invalid folddown coefficients state.
Interpret neighboring results carefully
| Result | Why it is a different boundary |
|---|---|
NS_E_INVALID_AUDIO_BUFFERMAX | maximum audio buffer setting is outside the accepted range or unit |
NS_E_INVALID_AUDIO_PEAKRATE_2 | audio peak bitrate does not exceed the configured average bitrate when constrained VBR requires it |
NS_E_INVALID_AUDIO_PEAKRATE | audio peak bitrate is outside the codec or mode's valid range |
Resolution and verification
The direct repair for this occurrence is to clamp or recalculate coefficients within -144 through 0 dB while preserving channel intent. 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 invalid folddown coefficients 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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