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MF_E_MEDIA_SOURCE_NOT_STARTED
MF_E_MEDIA_SOURCE_NOT_STARTED means the failing operation depends on an active source presentation, but the media source has not reached started state. IMFMediaSource::Start uses a presentation descriptor to determine which streams are active and completes asynchronously.
Confirm Start and stream activation
- Wait for the source/session events that confirm the start operation instead of assuming success immediately after the Start call returns.
- Verify that the presentation descriptor passed to Start belongs to the source and contains the intended stream selection.
- Do not issue stream work from a stale callback after Stop has completed; a stopped source resets its position and requires another Start.
When the Media Session owns a source, Microsoft recommends controlling playback through the session rather than calling transport methods on the source directly. Mixing both control paths can create exactly this kind of state mismatch.
Microsoft: IMFMediaSource::Start · Microsoft: sources with the Media Session · Microsoft: IMFMediaSource::Stop
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