Requirements: !DirectShow SDK, included in [http://www.microsoft.com/downloads/en/details.aspx?FamilyID=c17ba869-9671-4330-a63e-1fd44e0e2505&displaylang=en Windows SDK], tested with Windows SDK for Windows 7 and .NET Framework 3.5 SP1 [http://www.libsdl.org/release/SDL-devel-1.2.14-VC8.zip SDL 1.2 Win32 Development Libraries]. Unzip and add the include and lib directories path to Visual Studio configuration. ffmpeg dev lib from http://www.pjsip.org/tmp/ffmpeg-dev-gcc4.zip config_site.h: {{{ #define PJMEDIA_HAS_FFMPEG 1 #define PJMEDIA_VIDEO_DEV_HAS_SDL 1 #define PJMEDIA_VIDEO_DEV_HAS_DSHOW 1 }}}