HRESULT 0xC00D1B8A (NS_E_INPUTSOURCE

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Description:

One or all of the specified sources are not working properly. Check that the sources are configured correctly.%0

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NS_E_NO_AUDIODATA	NS_E_WME_VERSION_MISMATCH

NS_E_INPUTSOURCE_PROBLEM

How to interpret the code in a real encoding session

0xC00D1B8A is named NS_E_INPUTSOURCE_PROBLEM. Its practical scope is aggregate source-group health check reports one or more inputs unable to supply data, which belongs to source groups, streams and plug-ins rather than to every part of Windows Media playback or Windows itself.

Mechanism and point of failure

The Encoder object model groups audio, video and script inputs in an IWMEncSourceGroup, associates one profile with that group, and asks a source plug-in to expose a media format that can feed the selected output streams.

Successful creation of the COM objects does not prove that the source group is complete; profile assignment, source discovery and format negotiation are later checkpoints. A typical reproduction is: one device in an audio/video group disconnects while the other continues. This makes the first result from the Encoder more valuable than a later generic message.

Minimal experiment

Record 0xC00D1B8A, the Encoder version and the exact API call or property access that returned it.
Export the current .wme or .prx configuration, then capture per-source state and HRESULT, active group, last sample time and disconnect events.
Verify the source groups, streams and plug-ins precondition without changing the source, profile and output sink at the same time.
Run one controlled comparison that changes only the identified precondition: identify and repair the first failing source rather than changing the output profile.

Do not collapse these results together

Result	Why it differs
`NS_E_SOURCE_NOTSPECIFIED`	final source-group validation finds an incompletely configured source
`NS_E_WME_VERSION_MISMATCH`	loading a `.wme` configuration whose schema or feature set is unsupported by this Encoder version
`NS_E_NOSOURCEGROUPS`	starting an Encoder session with an empty source-group collection

What to change—and what to leave alone

Do not delete and recreate every source group before exporting the .wme configuration and recording the active group; otherwise the failing object relation is lost.

Authoritative documentation

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