What does HRESULT 0x000D61AF (MF_S_SEQUENCER_SEGMENT_AT_END_OF_STREAM) mean?

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Topology flags cannot be updated because the sequencer segment is at end of stream.

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MF_S_SEQUENCER_CONTEXT_CANCELED	MF_S_TRANSFORM_DO_NOT_PROPAGATE_EVENT

MF_S_SEQUENCER_SEGMENT_AT_END_OF_STREAM

MF_S_SEQUENCER_SEGMENT_AT_END_OF_STREAM is a Sequencer Source status for a late topology-flag update. The operation targets a segment that has already reached end of stream, so its queued topology flags can no longer be changed for that completed segment.

Apply last-segment flag changes while the segment is still queued

Keep the MFSequencerElementId returned by AppendTopology and pass that identifier to UpdateTopologyFlags.
When extending a playlist, remove SequencerTopologyFlags_Last from the previous last segment before it reaches end of stream.
Serialize playlist edits with sequencer/session event handling so a delayed UI, network, or worker-thread update does not target an already completed segment.

Microsoft's playlist example performs the previous-last-segment flag update before appending the new segment. Repeating the same flag update after this status does not change the already completed segment; the application must reconcile the current sequence state instead.

Microsoft: IMFSequencerSource::UpdateTopologyFlags · Microsoft: adding topologies to the Sequencer Source · Microsoft: Sequencer Source example code

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