Help! IStreamSample::Update() returns E_ABORT - what does it mean?

[alven]

Can someone from DirectShow gurus help me?

I have a code which feeds audio PCM exporting graph with sound data buffers. Loop iterates, but suddenly (not at first iteration) IStreamSample::Update() method returns E_ABORT. Why? And what does it mean?

Can someone explain to me what E_ABORT error means at all? It is translated as Operation aborted. What operation? Aborted by whom?

Thanks in advance,
alven