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MF_E_UNSUPPORTED_CHARACTERISTICS
Where the result originates
MF_E_UNSUPPORTED_CHARACTERISTICS means the media source exposes characteristics that the selected consumer or operation does not support.
The result comes from the source resolver, session, or operation checking source capabilities. A representative case is an operation requires a seekable finite source but receives a live, nonseekable network source.
Read the call sequence as a timeline. First, the application reaches the source resolver, session, or operation checking source capabilities. Next, the component evaluates the media source exposes characteristics that the selected consumer or operation does not support. A wrapper, user interface, or fallback path can report a less specific message afterward.
Evidence that survives retries
- Exact request: method name, all identifiers, units, flags, stream number, requested action, and this result.
- Object state: the MF_SOURCE_READER_MEDIASOURCE_CHARACTERISTICS or source flags, seekability, live/static status, pause and rate support, and stream topology.
- Correlation: callback cookie, object instance, URL or file identity, device identity, and timestamps from the same attempt.
- Underlying cause: the first Win32, COM, network, driver, policy, or component error reported before
0xC00D3E9E.
A controlled verification sequence
Use one controlled experiment: compare with a source whose characteristics differ in only one capability, such as seekable versus live. A useful comparison for this result changes exactly that variable; changing content, account, proxy, device, components, and version together makes attribution impossible.
| Outcome | Interpretation |
|---|---|
| The same operation now succeeds | The changed precondition was relevant to the failure. |
| A more specific earlier HRESULT appears | Preserve it; this result was probably a wrapper or terminal state. |
| The operation advances and fails later | The condition is fixed even though the complete workflow still has another defect. |
| No behavior changes | Restore the original baseline and test another documented prerequisite instead of stacking workarounds. |
Nearby results that mean something else
| Related code | Why it is not interchangeable |
|---|---|
MF_E_CANNOT_FIND_KEYFRAME_SAMPLE | No key frame sample was found. |
MF_E_NOT_PROTECTED | The file is not protected. |
MF_E_NETWORK_RESOURCE_FAILURE | An attempt to acquire a network resource failed. |
The important distinction is this: MF_E_INVALIDTYPE concerns media type negotiation, not source lifecycle capabilities. Use the symbolic constant and 0xC00D3E9E value to distinguish states that share a similar visible message.
Repair at the owning layer
Apply the narrow remedy: choose an operation compatible with the source or insert a supported buffering/recording stage. Then discard stale media objects, pending callbacks, cached provider sessions, or installer state as appropriate and rerun the exact request that originally returned it.
References
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