bento4Bento4 SDK Documentation – 314 1 WHY USE BENTO4? 1.1 Overview (README.txt) Bento4AP4 is a C++ class library desned to read and write ISO-MP4 files. This format isBento4 is an open source project that provides a portable C++ class library and tools for parsing and creating various types of media files, such as MP4, iTunes, Quicktime,