In reference to: http://trac.pjsip.org/repos/wiki/Getting-Started/Windows Additional Requirements: 3: ffmpeg To use ffmpeg with VS, inttypes.h and stdint.h will be needed, check ?here. This statement is not clear enough. The way it is written it means if you want to "USE" ffmpeg with a project you want to compile, then you must include both of those headers. It took some looking through errors to find out this is not true. What it needs to say is "To COMPILE ffmpeg with VS..." Thanks