The official title of MPEG-B is MPEG systems technologies. After developing MPEG-1, -2, -4 and -7, MPEG realised that there were specific systems technologies that did not fit naturally into any part 1 of those standards. Thus, after using the letter A in MPEG-A, MPEG decided to use the letter B for this new family of specifications.MPEG-B is composed of 13 parts, some of which are

1. Part 1 – Binary MPEG format for XML, also called Binary MPEG format for XML or BiM, specifies a set of generic technologies for encoding XML documents adding to and integrating the specifications developed in MPEG-7 Part 1 and MPEG-21 part 16 (link)
2. Part 4 – Codec configuration representation specifies a framework that enables a terminal to build a new video or 3D Graphics decoder by assembling standardised tools expressed in the RVC CAL language (link)
3. Part 5 – Bitstream Syntax Description Language (BSDL) specifies a language to describe the syntax of a bitstream
4. Part 7 – Common encryption format for ISO base media file format files specifies elementary stream encryption and encryption parameter storage to enable a single MP4 file to be used on different devices supporting different content protection systems (link)
5. Part 9 – Common Encryption for MPEG-2 Transport Streams is a similar specification as Part 7 for MPEG-2 Transport Stream
6. Part 11 – Green metadata specifies metadata to enable a decoder to consume less energy while still providing a good quality video (link)
7. Part 12 – Sample Variants defines a Sample Variant framework to identify the content protection system used in the client (link)
8. Part 13 – Media Orchestration contains tools for orchestrating in time (synchronisation) and space the automated combination of multiple media sources (i.e. cameras, microphones) into a coherent multimedia experience rendered on multiple devices simultaneously
9. Part 14 – Partial File Format enables the description of an MP4 file partially received over lossy communication channels by providing tools to describe reception data, the received data and document transmission information
10. Part 15 – Carriage of Web Resource in MP4 FF specifies how to use MP4 File Format tools to enrich audio/video content, as well as audio-only content, with synchronised, animated, interactive web data, including overlays.