DSHOW编译错误：strmbasd.lib(dllentry.obj) : error LNK2001: unresolved external symbol "class CFactoryTemplate * g_Templates" (?g_Templates@@3PAVCFactoryTemplate@@A)

需要添加如下代码：
CFactoryTemplate g_Templates[] = {
  { L"My ActiveX"
  , &CLSID_SystemClock
  , CSystemClock::CreateInstance
 }
};
int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);