Recommendation ITU-R BS.2088-2 (11/2025) Long-form file format for the
international exchange of audio
programme materials with metadata
Foreword
Policy on Intellectual Property Right (IPR)
Scope
Annex 1 (normative)  Specification of the BW64 File Format
1 Introduction
2 BW64 format description
     2.1 Contents of a BW64 format file
     2.2 Existing chunks defined as part of the RIFF/WAVE standard
     2.3 New Chunks and Structs in the BW64 format
     2.4 Using the  chunk to enable the use of files greater than 4 Gbytes in size
     2.5 Achieving compatibility between RIFF/WAVE and BW64
     2.6 Existing Chunks and Structs in the RIFF/WAVE format
          2.6.1 Elements of the  chunk
          2.6.2 Elements of the  chunk
          2.6.3 Elements of the  chunk
3 BW64 top level chunk
     3.1 Definition
     3.2 Elements of the  chunk
4 DS64 and JUNK chunks
     4.1 Definitions
     4.2 Elements of the  chunk
     4.3 Elements of the  chunk
5 AXML chunk
     5.1 Definition
     5.2 Elements of the  chunk
6 BXML chunk
     6.1 Definition
     6.2 Elements of the  chunk
7 SXML chunk
     7.1 Definition
     7.2 Elements of the  chunk
8 CHNA chunk
     8.1 Definition
     8.2 Elements of the  chunk
     8.3 Informative examples
          8.3.1 Simple stereo file
          8.3.2 Simple object-based example
          8.3.3 Multi-content example
9 Rules for XML Chunks
10 Compatibility with Recommendation ITU-R BS.1352
11 Generating XML broadcast metadata
12 File Extension of the BW64 format file
13 Bibliography
Annex 2 (informative)  RIFF WAVE (.WAV) file format
1 Waveform audio file format (WAVE)
     1.1 WAVE format chunk
     1.2 WAVE format categories
     1.3 Fact chunk
     1.4 Other optional chunks
2 PCM format
     2.1 Data packing for PCM WAVE files
     2.2 Data format of the samples
     2.3 Examples of PCM WAVE files
     2.4 Storage of WAVE data
     2.5 Fact chunk
     2.6 Other optional chunks
3 WAVE format extension
Annex 3  (normative)  Definitions of primitive data types
Annex 4 (informative)  Changes in specifications in Annex 1
1 Changes from Recommendation ITU-R BS.2088-0 to BS.2088-1
2 Changes from Recommendation ITU-R BS.2088-1 to BS.2088-2