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NS_E_NO_SMPTE_WITH_MULTIPLE_SOURCEGROUPS
NS_E_NO_SMPTE_WITH_MULTIPLE_SOURCEGROUPS: the failing boundary
NS_E_NO_SMPTE_WITH_MULTIPLE_SOURCEGROUPS (0xC00D1BA9) means It is not possible to generate a time code when there are multiple sources in a session. The important boundary is time-code topology; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that time-code generation is incompatible with a session that contains multiple source groups. It does not, by itself, prove a codec, permissions, network, device, or media problem outside that boundary. Preserve the first lower-level result when one exists, because later Player or Encoder errors can hide the original cause.
Evidence and focused verification
Record source-group count and time-code settings; reduce to one source group or disable generated time code, then revalidate the same session. Keep the media object, endpoint, profile, or device identity fixed while changing only that rejected precondition. A successful retest should pass this exact boundary; a different HRESULT from a later stage is new evidence, not recurrence of NS_E_NO_SMPTE_WITH_MULTIPLE_SOURCEGROUPS.
Technical references
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