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NS_E_VIDEO_BITRATE_STEPDOWN
The failing boundary in the Encoder object model
The useful reading of NS_E_VIDEO_BITRATE_STEPDOWN (0xC00D1BC0) is not merely the standard message shown above. It locates video bitrate decreases when total audience bitrate increases inside video stream and audience settings.
The video profile selects a codec and rate-control mode, then supplies bitrate, peak rate, frame rate, frame size, key-frame spacing, quality, buffer and optional interlace or pixel-aspect settings in a session that returns this result. The codec validates both values and combinations.
Evidence that separates this code from a wrapper error
A source preview does not prove that the output profile is accepted; output dimensions and rate-control settings are validated by the selected encoder codec in a session that returns this result. For example, the medium audience receives a larger video allocation than the high audience. 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 | audiences sorted by total bitrate and their video bitrate values |
| Producing object | audience index, codec FOURCC/index, VBR mode, width and height, frame rate, average and peak bitrate, buffer values, key-frame interval, quality values, interlace mode and pixel aspect ratio |
| 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 video bitrate stepdown boundary |
Interpret the next measurement
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is audiences sorted by total bitrate and their video bitrate values. It confirms video bitrate decreases when total audience bitrate increases in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the video bitrate stepdown 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 (video bitrate decreases when total audience bitrate increases), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: make video bitrate nondecreasing across ascending audiences. The original video bitrate stepdown call should then advance past the same checkpoint. |
The operational impact of it is limited to the video stream and audience settings transition that owns video bitrate decreases when total audience bitrate increases. In the representative case where the medium audience receives a larger video allocation than the high audience, keep the first failing call and its object identity so a later wrapper cannot replace the video bitrate stepdown evidence.
Test the condition without rewriting the session
- Record
0xC00D1BC0, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture audiences sorted by total bitrate and their video bitrate values. - verify the video 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: make video bitrate nondecreasing across ascending audiences.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier video bitrate stepdown state.
Interpret neighboring results carefully
| Result | Why it is a different boundary |
|---|---|
NS_E_INVALID_VIDEO_BITRATE | video average bitrate is rejected by the selected codec or audience configuration |
NS_E_INVALID_VIDEO_PEAKRATE | video peak bitrate lies outside the codec or VBR mode's accepted range |
NS_E_INTERLACE_REQUIRE_SAMESIZE | interlace-preserving output is configured with dimensions different from the input |
Resolution and verification
The direct repair for this occurrence is to make video bitrate nondecreasing across ascending audiences. 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 video bitrate stepdown checkpoint.
Do not rely on the UI label alone; record the numeric profile fields and codec identity before changing presets in a session that returns it.
References for the boundary
- Selecting a video codec for an audience.
- IWMEncProfile2.VBRMode.
- IWMEncVideoSource2.Width and live capture sizing.
- Non-square pixel mode in an encoder profile.
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