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MF_E_HW_MFT_FAILED_START_STREAMING
The practical meaning of this HRESULT
MF_E_HW_MFT_FAILED_START_STREAMING means a hardware Media Foundation transform was activated but could not acquire resources when streaming began.
The result comes from the selected hardware decoder, encoder, or processor at the start-streaming transition. A representative case is the GPU decoder supports the profile but all available decode surfaces or hardware sessions are already occupied.
Evidence to preserve
MFT CLSID, adapter LUID, input/output types, concurrent sessions, D3D device manager, driver version, and start-streaming event order.
A narrow diagnostic run
- Record and verify: MFT CLSID, adapter LUID, input/output types, concurrent sessions, D3D device manager, driver version, and start-streaming event order.
- Run the controlled comparison: force a software MFT for the same media types and then retry the hardware path after releasing competing sessions.
Distinguish the neighboring failures
| HRESULT | Meaning in the standard description |
|---|---|
MF_E_INVALID_CODEC_MERIT | The registered codec merit is not valid. |
MF_E_OPERATION_IN_PROGRESS | The operation is already in progress. |
MF_E_OUT_OF_RANGE | The value is not in the specified or valid range. |
Here, codec-not-found means no transform was selected; this code occurs after a hardware MFT exists but cannot start.
Finish with a repeatable fix
For this occurrence, release hardware sessions, correct device-manager binding, or update the driver; retain software fallback where appropriate.
Authoritative references
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