Error 0x80040293

Value: -2147220845 | 0x80040293 | 2147746451

What does it mean ?

VFW_E_PIN_ALREADY_BLOCKED_ON_THIS_THREAD  
This thread has already blocked this output pin. There is no need to call IPinFlowControl::Block() again.%0
Value: 659 | 0x0293 | 0b0000001010010011

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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