why IBASICVIDEO2 BASE CALSS UNDEFINED ERROR, when I compiled samples in dxmedia

["jun wang" <seawan_wj@hotmail.com>]

When I tried to compile some samples inside direct media sdk 6.0 ,why 
display"
error C2504: 'IBasicVideo2' : base class undefined
d:\DXMEDIA\CLASSES\BASE\sysclock.h(23) : error C2504: 'IAMClockAdjust' : 
base class undefined"

tks.

Wang Jun
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