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 isI want to output fragmented mp4 file format for live streaming. So, how to write a fragmented mp4 file programmatically using Bento4?