HRESULT 0x000D36D8 (MF_S_MULTIPLE_BEGIN): meaning and diagnosis

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BeginGetEvent was repeated with the same callback and state while pending.

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NS_S_CHANGENOTICE	MF_S_ACTIVATE_REPLACED

MF_S_MULTIPLE_BEGIN

MF_S_MULTIPLE_BEGIN is the idempotent case of a repeated IMFMediaEventGenerator::BeginGetEvent call. The generator already has a pending request with the same callback pointer and the same state object, so it keeps the existing request rather than creating a second subscription.

Keep one outstanding asynchronous event request

Call EndGetEvent from the callback before requesting the next event.
Re-arm BeginGetEvent once per completed callback, not from several control paths.
Log callback and state pointer identities when duplicate registrations are hard to reproduce.

This success status differs from MF_E_MULTIPLE_BEGIN, where the callback matches but the state object differs, and from MF_E_MULTIPLE_SUBSCRIBERS, where another callback is already registered.

Microsoft: IMFMediaEventGenerator::BeginGetEvent · Microsoft: media event generators · Wine mfplat source

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