HRESULT 0xC00D4E24 (MF_E_VIDEO_DEVICE

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The shared Direct3D video device is already locked by another component or thread.

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MF_E_VIDEO_REN_SURFACE_NOT_SHARED	MF_E_NEW_VIDEO_DEVICE

MF_E_VIDEO_DEVICE_LOCKED

MF_E_VIDEO_DEVICE_LOCKED is a synchronization result from the shared video-device path used by the EVR and DXVA components. The Direct3D Device Manager serializes access to the shared Direct3D 9 device.

Find the unmatched or long-held device lock

Log every device-manager LockDevice and corresponding UnlockDevice with thread ID and handle.
Measure how long the lock is held and avoid running blocking I/O, callbacks, or unrelated decoding work while owning it.
When using nonblocking locking, handle the locked result as contention rather than immediately resetting the graphics device.

Microsoft documents that LockDevice returns immediately with a video-device-locked error when the device is already locked and waiting was not requested. Retrying may be reasonable only after the current owner releases the device; a permanent failure usually indicates broken lock ownership or teardown ordering.

Microsoft: IDirect3DDeviceManager9::LockDevice · Microsoft: Direct3D Device Manager · Microsoft: EVR device sharing

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