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NS_E_SOURCEGROUP_NOTPREPARED
The source group has not completed preparation
NS_E_SOURCEGROUP_NOTPREPARED (0xC00D1B7A) is a lifecycle sequencing result. The caller tries to activate/start a source group that has not successfully passed the encoder's preparation phase.
Trace configuration to preparation
Record source-group creation, profile assignment, PrepareToEncode call/result, asynchronous callbacks, and the subsequent activation/start call. Do not assume a successful preview implies preparation completed.
Correction
Finish configuration, wait for successful preparation, then start the group. If preparation itself fails, diagnose that earlier HRESULT rather than retrying Start.
Technical references
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