These filters have been developed under Visual Studio 2005 SP1. With installed Vista Platform SDK which contains baseclasses for DirectShow filters. All filters link against 2 libraries which need to be compiled first from platform SDK: 1. strmbasdu.lib - debug version of baseclasses. compiled with unicode support. 2. strmbaseu.lib - release version of baseclasses. also compiled with unicode support. I have decided to include the libs I use, which also have patched support for MFC. In time I will add patched files as well as projects for VS 2003. Igor.