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E_PROP_SET_UNSUPPORTED
E_PROP_SET_UNSUPPORTED — 0x80070492
This result belongs to unsupported kernel-streaming property set not to a generic restart checklist, because the target object does not implement the requested property-set GUID at all.
Start at the returning layer
DirectShow and kernel-streaming property access is negotiated by property-set GUID, property ID, target object, operation type, instance data, and buffer sizes. In the context of unsupported kernel-streaming property set, QuerySupported is the correct capability boundary; display names and device family assumptions are not. Locate the first component changing state in this condition and distinguish later summary errors.
Important boundary. A supported set with one unknown property should return E_PROP_ID_UNSUPPORTED instead. Record the exact constant and returning API.
Minimum useful evidence
| Capture | Diagnostic question |
|---|---|
| Property-set GUID, target pin/filter/device, interface used, and QuerySupported result | Provides a stable before/after comparison for feature negotiation. |
| Driver/filter version and whether the request reached the intended object | Shows whether the set, the individual property, or the requested access mode is unsupported. |
| Get/Set operation, instance data, and media graph topology | Ties the result to one property-set GUID, property ID, and target object. |
| A property set known to be implemented by the same target | Separates capability discovery from buffer, driver, and graph-topology problems. |
Preserve the smallest reproducible property-call trace and redact device serials or private media before sharing it.
Separate state from data
- Query support on the exact pin or filter before access. Record the exact QuerySupported, Get, or Set result that changes.
- Compare with the same property set on a device documented to support it. Keep the property-set GUID, property ID, target object, and access flags fixed.
- Verify that the caller did not confuse the incompatible IKsPropertySet interfaces from different headers. Use a disposable graph or test device when probing this condition could reconfigure streaming state.
Stop after the first comparison that changes QuerySupported, Get, or Set behavior and diagnose that new capability boundary independently.
Nearby states and false leads
When a minimal control succeeds, the failure is tied to the original object or its state rather than to the whole Windows subsystem. When the control fails identically, preserve host-level evidence first. If a different code appears, that is a moved boundary, not automatic success.
Capability discovery belongs before Get or Set; an unsupported capability is not repaired by enlarging buffers or rebuilding the filter graph.
Verification after correction
Correction: Select a supported interface/property set, correct the target object, or disable the optional feature through capability discovery. Keep the original property-set GUID, property ID, target object, driver version, and graph topology so the change can be reversed and explained.
Accept the repair only when the application negotiates capabilities per object and never issues unsupported set operations during normal graph construction. Repeat the original supported operation under the original identity and object state; another device model, different pin, or simplified filter graph is useful comparison evidence but not final regression proof.
Technical references
These sources describe the API, service architecture, and status values relevant to this diagnosis: Check version-specific behavior against the DirectShow, kernel-streaming, and driver generation that returned the result.
- Microsoft: IKsPropertySet Set contract — defines the formal status or component boundary.
- Microsoft: IKsPropertySet Get contract — documents the relevant API or lifecycle.
- Microsoft: IKsPropertySet QuerySupported — provides the architecture, format, or protocol context.
- Microsoft: DirectShow capture-pin property-set requirements — supports the controlled verification criteria.
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