What does HRESULT 0xC00D36FC (MF_E_SESSION_PAUSEWHILESTOPPED) mean?

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IMFMediaSession::Pause was called while the Media Session was stopped.

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MF_E_BYTESTREAM_UNKNOWN_LENGTH	MF_E_FORMAT_CHANGE_NOT_SUPPORTED

MF_E_SESSION_PAUSEWHILESTOPPED

MF_E_SESSION_PAUSEWHILESTOPPED is specific to the Media Session transport contract. IMFMediaSession::Pause pauses the presentation clock and completes asynchronously with MESessionPaused, but the method is not valid while the session is stopped.

Start the presentation before pausing it

Track the last completed session state from Media Session events, not only the last method that application code called.
Disable or queue Pause while the session is stopped or while a Start command is still pending.
When implementing UI controls, update the transport state after MESessionStarted and MESessionPaused rather than optimistically on button press.

This HRESULT is more precise than a generic wrong-state error. Recreating the topology or installing a decoder will not make Pause valid from the stopped state.

Microsoft: IMFMediaSession::Pause · Microsoft: controlling presentation states

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