MP4Box is a multimedia packager, with a vast number of functionalities: conversion, splitting, hinting, dumping and others. It is a command-line tool whose major switches are documented here. MP4BOX HELP A rather complete description of MP4Box functionalities and various switches. MPEG-4 SYSTEMS Documentation of GPAC specific handling of MPEG-4 scene description textual formats: BT and XMT-A. NH