In order to build this splitter the source of Bento4 has to be extracted into the AP4 directory. Location: http://sourceforge.net/projects/bento4/ !!!IMPORTANT!!! There are a few necessary changes need to be done before it can be compiled. Just overwrite the original library files with what you can find at .\AP4\Update\. There are only project files for vc2k5b2 because I don't have vc2k3 anymore. So if you want to build with that you have to create them yourself. (just decreasing the version number of sln/vcproj works usually...)