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NS_E_INVALID_VIDEO_BUFFER
How to interpret the code in a real encoding session
0xC00D1BC9 is named NS_E_INVALID_VIDEO_BUFFER. Its practical scope is video buffer setting is invalid for the selected codec and bitrate mode, which belongs to video stream and audience settings rather than to every part of Windows Media playback or Windows itself.
Mechanism and point of failure
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.
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. A typical reproduction is: a configuration tool confuses seconds with milliseconds. This makes the first result from the Encoder more valuable than a later generic message.
Reproduction matrix
| Field | What to preserve |
|---|---|
| Decisive values | buffer value and units, average bitrate, codec and audience index |
| 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 invalid video buffer boundary |
Evidence matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is buffer value and units, average bitrate, codec and audience index. It confirms video buffer setting is invalid for the selected codec and bitrate mode in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the invalid video buffer 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 buffer setting is invalid for the selected codec and bitrate mode), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: choose a supported buffer duration/size using the correct API units. The original invalid video buffer 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 buffer setting is invalid for the selected codec and bitrate mode. In the representative case where a configuration tool confuses seconds with milliseconds, keep the first failing call and its object identity so a later wrapper cannot replace the invalid video buffer evidence.
Minimal experiment
- Record
0xC00D1BC9, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture buffer value and units, average bitrate, codec and audience index. - 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: choose a supported buffer duration/size using the correct API units.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier invalid video buffer state.
Do not collapse these results together
| Result | Why it is a different boundary |
|---|---|
NS_E_INVALID_VIDEO_CQUALITY | codec quality control is outside the supported range |
NS_E_INVALID_VIDEO_BUFFERMAX | maximum video buffer value is outside the accepted range |
NS_E_INVALID_VIDEO_IQUALITY | video image-quality/sharpness control is outside its permitted range |
What to change—and what to leave alone
Change the smallest responsible precondition: choose a supported buffer duration/size using the correct API units. While retesting it, keep all unrelated source, audience and output values fixed until the same call is repeated.
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.
Authoritative documentation
- 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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