| Previous | Next |
| NS_E_DRM_PASSWORD_TOO_LONG | NS_E_INTERLACE_REQUIRE_SAMESIZE |
NS_E_DEVCONTROL_FAILED_SEEK
The failing boundary in the Encoder object model
The useful reading of NS_E_DEVCONTROL_FAILED_SEEK (0xC00D1B94) is not merely the standard message shown above. It locates device-control plug-in cannot position tape at the requested EDL mark-in inside tape-device control and edit decision lists.
Windows Media Encoder device control coordinates a capture source with a control plug-in, tape transport, mark-in/mark-out entries and an edit decision list in a session that returns this result. The capture device and the control device must refer to the same usable hardware path.
Evidence that separates this code from a wrapper error
Video capture can remain available while the separate control plug-in loses transport control, so a device-control failure is not automatically a capture-format failure in a session that returns this result. For example, an EDL references a timecode earlier than the recorded tape segment. 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 | target mark-in, current raw timecode, tape limits, transport state and plug-in seek result |
| Producing object | control plug-in CLSID, controlled device identifier, transport state, tape presence, EDL entry count, mark-in/mark-out values, seek result, source-group binding and disconnect event |
| 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 devcontrol failed seek boundary |
Interpret the next measurement
| Observation | How to interpret it |
|---|---|
| Observation that supports it | The decisive evidence is target mark-in, current raw timecode, tape limits, transport state and plug-in seek result. It confirms device-control plug-in cannot position tape at the requested EDL mark-in in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the devcontrol failed seek 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 (device-control plug-in cannot position tape at the requested EDL mark-in), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: correct the EDL time and verify tape/device positioning before encoding. The original devcontrol failed seek call should then advance past the same checkpoint. |
The operational impact of it is limited to the tape-device control and edit decision lists transition that owns device-control plug-in cannot position tape at the requested EDL mark-in. In the representative case where an EDL references a timecode earlier than the recorded tape segment, keep the first failing call and its object identity so a later wrapper cannot replace the devcontrol failed seek evidence.
Test the condition without rewriting the session
- Record
0xC00D1B94, it, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture target mark-in, current raw timecode, tape limits, transport state and plug-in seek result. - verify the tape-device control and edit decision lists precondition without changing the source, profile and output sink at the same time.
- Run one controlled comparison in which only this condition changes: correct the EDL time and verify tape/device positioning before encoding.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier devcontrol failed seek state.
Interpret neighboring results carefully
| Result | Why it is a different boundary |
|---|---|
NS_E_INVALID_DEVICE | selected hardware lacks the tape-transport control capabilities required by the control plug-in |
NS_E_TOO_MANY_DEVICECONTROL | more than one control plug-in attempts to own the same encoding device |
NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED | the control device for the active source group disconnects while capture is active |
Resolution and verification
The direct repair for this occurrence is to correct the EDL time and verify tape/device positioning before encoding. 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 devcontrol failed seek checkpoint.
Do not rewind, eject or overwrite the tape before recording the failing EDL entry and current timecode; that changes the evidence used to reproduce the seek or end-of-tape condition in a session that returns it.
References for the boundary
- WMEncEditDecisionList.Item.
- WMTIMECODE device-control structure.
- IWMEncSource.MarkOut.
- Preparing a source group for encoding.
Looking for a different code? Search another status or error code.