title: DirectShow Compile issue
body: <p>I am working with vs2010 on 64bit platform and Windows SDKv 7.1. I built the baseclasses for the 64 bit platform and configured it in my project.
  but i am facing the following issue.I am trying to interface a logitech 910 HD camera.</p>
  
  <pre><code>1&gt;LogitechC910Interface.obj : error LNK2001: unresolved external symbol __imp_VariantClear
  1&gt;LogitechC910Interface.obj : error LNK2001: unresolved external symbol __imp_CoCreateInstance
  1&gt;LogitechC910Interface.obj : error LNK2001: unresolved external symbol __imp_CoUninitialize
  1&gt;LogitechC910Interface.obj : error LNK2001: unresolved external symbol __imp_VariantInit
  1&gt;LogitechC910Interface.obj : error LNK2001: unresolved external symbol __imp_CoInitializeEx
  1&gt;C:\PMD\windows\windows64bit\PMDSDK\examples\Release\simple.exe : fatal error LNK1120: 5 unresolved externals
  ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
  </code></pre>