bento4Bento4 SDK Documentation – 314. 1. WHY USE BENTO4? 1.1 Overview (README.txt). Bento4AP4 is a C++ class library desned to read and writeBento4 is a fast, modern, and cross-platform library and tools for reading and writing ISO-MP4 files and related formats. It supports H.264, H.265, AAC, Dolby Vision, DRM, and more