CONTENTS

         U.1     Introduction
        U.2     Video source coding algorithm
        U.3     Forward-channel syntax
                  U.3.1     Syntax of the picture, GOB, and slice layer
                  U.3.2     Macroblock layer syntax
        U.4     Decoder process
                  U.4.1     Decoder process for short‑/long-term picture management
                  U.4.2     Decoder process for reference picture buffer mapping
                  U.4.3     Decoder process for sub-picture removal
                  U.4.4     Decoder process for multi-picture motion compensation
                  U.4.5     Decoder process for reference picture buffering
        U.5     Back-channel messages
                  U.5.1     BCM separate logical channel layer
                  U.5.2     Back-channel message layer syntax