Вот справка по DirectShow:
IMediaPosition::get_Duration
The get_Duration method retrieves the duration of the stream.
Syntax
HRESULT get_Duration(
REFTIME *plength
);
Parameters
plength
[out] Pointer to a variable that receives the total stream length, in seconds.
Return Values
Returns an HRESULT value. Possible values include the following.
Return code Description
S_OK Success.
E_NOTIMPL Not implemented.
E_POINTER NULL pointer argument.
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