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Technical Paper


(3 June 2016)

Infrastructure of audiovisual services ‑ Communication procedures

Media coding toolbox for IPTV: Audio and video codecs

International Telecommunication Union


This ITU-T Technical Paper addresses the use of audio and video coding in services delivered over Internet Protocols (IP). This document describes specific codecs for use within an IPTV environment. For audio coding, it describes the use of MPEG-1 Layer II, AC-3, E-AC3, HE AAC v2 audio, Extended AMR WB (AMR WB+) audio, MPEG 2 AAC, MPEG-4 HE AAC, MPEG-4 HE AAC v2, MPEG Surround, MPEG-4 ALS, G719, G.722, G.722.1, G.722.1 Annex C, G.722.2, G.729.1, G.711.1 and G.718. For video coding, it recommends support for ITU-T H.265 | ISO/IEC 23008-2 HEVC and H.264 | 14496-10 AVC, and also lists some additional video coding technologies that have been identified in member contributions as potentially relevant to the application (ITU-T H.262 | ISO/IEC 13818-2 MPEG-2 Video, AVS, H.263, MPEG-1, MPEG-4 Part 2, and VC-1). This document adopts a "toolbox" approach for the general case of IPTV applications delivered directly over IP and MPEG2 -TS. This document is not a specification for the use of audio or video codecs in IPTV Services.


Media coding; IPTV; Audio codecs; Speech codecs; video codecs; audiovisual media; captions; subtitles; descriptive audio

Change log

This document contains the 3rd edition of the ITU-T Technical Paper on "Media coding toolbox for IPTV: Audio and Video codecs" approved at the ITU-T Study Group 16 meeting held in Geneva, 23 May – 3 June 2016.

The 2nd edition of this ITU-T Technical Paper on "Media coding toolbox for IPTV: Audio and Video codecs" was approved at the ITU-T Study Group 16 Working Party 3/16 meeting held in Geneva, 10 July 2009.

The 1st edition of this ITU-T Technical Paper was entitled "Media coding toolbox for IPTV: Audio codecs" and was approved at the ITU-T Study Group 16 meeting held in Geneva, 27 January – 6 February 2009.


Jill Boyce

Tel: +1 503 712 2977

Gary J. Sullivan

Tel: +1 425 703-5308



International Telecommunication Union 1

1Scope 1

2References 1

3Definitions 3

4Abbreviations 3

5Document structure 5

5.1Available audio and speech codecs 5

6Audio codecs 6

6.1AC-3 6

6.1.1Overview of AC-3 6

6.1.2Transport of AC-3 7

6.1.3Enhanced AC-3 8

6.1.4Overview of Enhanced AC-3 8

6.1.5Transport of Enhanced AC-3 8

6.1.6Storage of AC-3 and Enhanced AC-3 bitstreams 9

6.1.7AC-3 and Enhanced AC-3 track definition 9

6.1.8Sample definition for AC-3 and Enhanced AC-3 9

6.1.9Details of AC3SpecificBox 9

6.1.10Details of EC3SpecificBox 11

6.2Extended AMR‑WB (AMR‑WB+) 12

6.2.1Overview of AMR-WB+ codec 12

6.2.2Transport and storage of AMR-WB+ 13

6.3MPEG‑4 High Efficiency AAC v2 15

6.3.1Overview of HE AAC v2 15

6.3.2Transport and storage of HE AAC v2 17

6.3.3HE AAC v2 Levels and Main Parameters for DVB 17

6.3.4Methods for signalling of SBR and/or PS 18

6.4MPEG-1 Layer 2 Audio 18

6.5MPEG-2 AAC 19

6.5.1Overview of MPEG-2 AAC 19

6.5.2Overview of Encoder 20

6.5.3Overview of decoder 22

6.6MPEG Surround 23

6.6.1Introduction 23

6.6.2MPEG Surround features 24

6.6.3Introduction to MPEG Surround Baseline profile 25

6.6.4Binaural Decoding 25

6.6.5External stereo mix 25

6.6.6Enhanced Matrix Mode 26

6.6.7MPEG Surround for MPEG-1 Layer II‑- Baseline Profile 27

6.6.8MPEG Surround for MPEG 4 AAC, HE AAC and HE AAC v2‑- Baseline Profile 27

6.7ITU-T G.719 27

6.7.1Overview of the G.719 encoder 28

6.7.2Overview of the G.719 decoder 28

6.7.3Transport and storage of ITU-T G.719 29

6.8MPEG-4 ALS lossless coding 29

6.8.1Performance 30

6.8.2Related standardization 31

7Speech Codecs 32

7.1ITU-T G.722 32

7.1.1Overview of main functional features 32

7.1.2Overview of G.722 SB-ADPCM encoder 32

7.1.3Lower sub-band ADPCM encoder 33

7.1.4Higher sub-band ADPCM encoder 33

7.1.5Overview of G.722 SB-ADPCM decoder 33

7.1.6Packet loss concealment algorithms for G.722 34

7.2ITU-T G.722.1 and G.722.1 Annex C 35

7.3ITU-T G.722.2 (3GPP AMR-WB) 38

7.3.1Overview of AMR-WB codec 38

7.3.2Transport and storage of AMR-WB 41

7.4ITU-T G.729.1 41

7.4.1Overview of the encoder 41

7.4.2Overview of the decoder 42

7.4.3RTP payload 43

7.5ITU-T G.711.1 44

7.5.1Overview of G.711.1 algorithm 44

7.5.2Transport of G.711.1 46

7.5.3Transcoding with G.711 46

7.6ITU-T G.718 46

7.6.1Overview of the G.718 encoder 47

7.6.2Overview of the G.718 decoder 49

8Video codecs 51

List of Tables

List of Figures

ITU-T Technical Paper HSTP-MCTB

Media coding toolbox for IPTV: Audio and video codecs

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