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 MP4 SDK · Table of contents · Menu · Table of contents · Get in touch. Submit feedback about this site to: helpdocs@. © documentation.help.