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NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED
Diagnostic meaning beyond the standard text
For NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED (0xC00D1BA6), the actionable event is the control device for the active source group disconnects while capture is active. Keep the NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED producing boundary attached to the original Encoder callback or COM call.
Why the session can reach this point
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 NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED. The capture device and the control device must refer to the same usable hardware path at the active sg device control disconnected checkpoint.
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 NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED. One concrete way to reach the condition is that the DV deck control interface disappears while its video stream remains briefly available. The NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED 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 | control-device identifier, plug-in state, transport event and capture-device state |
| 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 NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED |
| Lower-level evidence | the first COM, driver, file-system or codec HRESULT observed before the Encoder mapped the condition to NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED |
| Controlled comparison | a known-good session that changes only the setting named in the active sg device control disconnected boundary |
Decision matrix
| Observation | How to interpret it |
|---|---|
| Observation that supports this result | The decisive evidence is control-device identifier, plug-in state, transport event and capture-device state. It confirms the control device for the active source group disconnects while capture is active in the same object generation. |
| Observation that points to an earlier failure | The recorded values satisfy the active sg device control disconnected 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 (the control device for the active source group disconnects while capture is active), but a codec, archive or broadcast sink then fails in a subsequent stage. |
| Verification after correction | Apply this isolated change: stop device-controlled capture and reconnect or replace the control path before resuming. The original active sg device control disconnected call should then advance past the same checkpoint. |
The operational impact of NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED is limited to the tape-device control and edit decision lists transition that owns the control device for the active source group disconnects while capture is active. For NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED, it does not, by itself, prove that every input is corrupt, every codec is missing or the complete Windows Media installation is unusable. In the representative case where the DV deck control interface disappears while its video stream remains briefly available, keep the first failing call and its object identity so a later wrapper cannot replace the active sg device control disconnected evidence.
Decision path
- Record
0xC00D1BA6,NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED, the Encoder version and the exact API call or property access that returned it. - Export the current
.wmeor.prxconfiguration, then capture control-device identifier, plug-in state, transport event and capture-device state. - For
NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED, 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: stop device-controlled capture and reconnect or replace the control path before resuming.
- After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier active sg device control disconnected state.
Codes with similar symptoms but different owners
| Result | Why it is a different boundary |
|---|---|
NS_E_TOO_MANY_DEVICECONTROL | more than one control plug-in attempts to own the same encoding device |
NS_E_END_OF_TAPE | tape transport reaches the recorded end or no usable tape is present |
NS_E_DEVCONTROL_FAILED_SEEK | device-control plug-in cannot position tape at the requested EDL mark-in |
Safe recovery
Resolve the producing condition by ensuring that you stop device-controlled capture and reconnect or replace the control path before resuming. Then rebuild only the portion of the Encoder graph affected by NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED and verify the original call.
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 NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED.
Source material for NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED
- WMEncEditDecisionList.Item.
- WMTIMECODE device-control structure.
- IWMEncSource.MarkOut.
- Preparing a source group for encoding.
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