The PROPSETID_EXT_TRANSPORT property set controls the transport of data to and from an external device.
The KSPROPERTY_EXTXPORT enumeration in ksmedia.h specifies the properties of this set.
Support for this property set is optional and should be implemented only by minidrivers that support external video capture devices.
The DirectShow IAMExtTransport interface (see the DirectShow documentation in the Microsoft Windows SDK). provides access to the properties of this set. The interface defines many methods, but only a subset for external device control are implemented.
Build date: 10/26/2012