Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 13: MMT implementation guidance

This document provides guidance for implementing and deploying systems based on ISO/IEC 23008‑1.

Technologies de l'information — Codage à haute efficacité et livraison des medias dans des environnements hétérogènes — Partie 13: Titre manque

General Information

Status
Published
Publication Date
14-Dec-2020
Current Stage
6060 - International Standard published
Start Date
15-Dec-2020
Completion Date
15-Dec-2020
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TECHNICAL ISO/IEC TR
REPORT 23008-13
Third edition
2020-12
Information technology — High
efficiency coding and media delivery
in heterogeneous environments —
Part 13:
MMT implementation guidance
Reference number
ISO/IEC TR 23008-13:2020(E)
ISO/IEC 2020
---------------------- Page: 1 ----------------------
ISO/IEC TR 23008-13:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC TR 23008-13:2020(E)
Contents Page

Foreword ......................................................................................................................................................................................................................................vii

Introduction ................................................................................................................................................................................................................................ix

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General overview of MPEG media transport ........................................................................................................................... 1

4.1 System overview .................................................................................................................................................................................... 1

4.2 Tools specified in ISO/IEC 23008-1 ...................................................................................................................................... 2

5 MMT function deployments ...................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Object reconstruction ........................................................................................................................................................................ 3

5.2.1 General...................................................................................................................................................................................... 3

5.2.2 Recovery in MPU mode .............................................................................................................................................. 4

5.2.3 Recovery in GFD mode ................................................................................................................................................ 6

5.3 Default assets ........................................................................................................................................................................................... 6

5.4 Low-delay live streaming ............................................................................................................................................................... 7

5.5 Parallel processing in MMT sending and receiving entities ............................................................................. 9

5.5.1 Processing in MMT sending entity ................................................................................................................... 9

5.5.2 Processing in MMT receiving entity .............................................................................................................11

5.6 MPU streaming for live services ............................................................................................................................................13

5.6.1 MPU packetization.......................................................................................................................................................13

5.6.2 Sending of MPU and signalling message ..................................................................................................16

5.6.3 MPU generation for SHVC-encoded video in real-time streaming .....................................17

5.7 Fast MMT session acquisition .................................................................................................................................................19

5.8 Referencing and processing non-timed data .............................................................................................................20

5.8.1 General...................................................................................................................................................................................20

5.8.2 Resource grouping and referencing .............................................................................................................20

5.8.3 Receiver handling .........................................................................................................................................................21

5.9 Media adaptation for quality control in MMTP ........................................................................................................21

5.9.1 General...................................................................................................................................................................................21

5.9.2 Parameters for media adaptation ..................................................................................................................21

5.9.3 Adaptation operation of MMT entity ...........................................................................................................21

5.10 Hybrid delivery in MMT ...............................................................................................................................................................22

5.10.1 General...................................................................................................................................................................................22

5.10.2 Classification of hybrid delivery ......................................................................................................................22

5.10.3 Technical elements for hybrid delivery .....................................................................................................23

5.11 Example of detailed implementation of MMT ...........................................................................................................24

5.11.1 Use case: Combination of MMT and MPEG-2 TS for synchronized presentation .24

5.11.2 Use case: Combination of MMT and HTTP streaming for synchronized

decoding ...............................................................................................................................................................................24

5.11.3 Use case: Content request in advance for synchronized play-out ......................................25

5.12 HRBM signalling for hybrid delivery .................................................................................................................................26

5.12.1 Hybrid delivery from the single MMT sending entity ...................................................................26

5.12.2 Hybrid delivery from the multiple MMT sending entities ........................................................27

5.13 Error resilience in MMT protocol ........................................................................................................................................29

5.14 Delay constrained ARQ .................................................................................................................................................................30

5.14.1 General...................................................................................................................................................................................30

5.14.2 Delivery-time constrained ARQ........................................................................................................................30

5.14.3 Arrival-deadline constrained ARQ .................................................................................................................31

5.15 Delivery of encrypted MPUs .....................................................................................................................................................33

5.16 HRBM message updating ............................................................................................................................................................33

5.16.1 General...................................................................................................................................................................................33

© ISO/IEC 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/IEC TR 23008-13:2020(E)

5.16.2 HRBM message sending schedule ..................................................................................................................34

5.16.3 Use case.................................................................................................................................................................................34

5.16.4 HRBM buffer operation in unicast environment ...............................................................................35

5.17 MMTP packet with padded data ...........................................................................................................................................37

5.18 Constraints on signalling splicing points ......................................................................................................................39

5.18.1 General...................................................................................................................................................................................39

5.18.2 Constraints on Case 1 – Asset change at the start of MPU ........................................................39

5.18.3 Constraints on Case 2 – Asset change at a point in MPU ............................................................39

5.18.4 Signal the splicing point for target assets in Case 1 and Case 2 ...........................................40

6 Use cases for MMT deployment ..........................................................................................................................................................40

6.1 General ........................................................................................................................................................................................................40

6.2 Delivery of DASH presentations using MMT ..............................................................................................................40

6.2.1 General...................................................................................................................................................................................40

6.2.2 Delivery of the MPD ........................................................................................................................................... .........41

6.2.3 Delivery of the data segments ...........................................................................................................................41

6.3 Client operation for DASH service delivered through MMT protocol ...................................................42

6.3.1 Delivery of MPD with MMTP ..............................................................................................................................42

6.3.2 Delivery and consumption of DASH segments with MMTP .....................................................42

6.4 Hybrid of MMT and DASH over heterogeneous network ................................................................................44

6.5 MMT caching for effective bandwidth utilization ..................................................................................................45

6.5.1 Overview of MMT caching middlebox architecture ........................................................................45

6.5.2 Content-based caching of MMT media .......................................................................................................46

6.5.3 MPU sync protocol between server and caching middlebox ..................................................48

6.5.4 MMT cache manifest ..................................................................................................................................................53

6.6 Usage of ADC signalling message .........................................................................................................................................55

6.6.1 General...................................................................................................................................................................................55

6.6.2 Operation in MMT sending entity ..................................................................................................................55

6.6.3 Operation in MANE router ...................................................................................................................................55

6.6.4 Example operation in MMT-receiving entities ....................................................................................55

6.6.5 QoE multiplexing gain and bottleneck coordination .....................................................................55

6.7 MMT deployment in Japanese broadcasting systems ........................................................................................58

6.7.1 General...................................................................................................................................................................................58

6.7.2 Broadcasting systems using MMT .................................................................................................................59

6.7.3 Media transport protocol ......................................................................................................................................61

6.7.4 Signalling information..............................................................................................................................................66

6.7.5 Start-up procedure of broadcasting service .................. ........................................................................74

6.7.6 Actual packet structure ...........................................................................................................................................77

6.8 MMT deployment in ATSC 3.0 systems ...........................................................................................................................79

6.9 Implementation of MMT based on D-TMB in China .............................................................................................81

6.9.1 Background........................................................................................................................................................................81

6.9.2 MMT over legacy DTMB infrastructure .....................................................................................................81

6.9.3 Use cases ..............................................................................................................................................................................81

6.10 Conversion of MMTP stream to MPEG-2 TS ................................................................................................................83

6.10.1 Overview of conversion operation ................................................................................................................83

6.10.2 Restrictions to MMTP packets ...........................................................................................................................83

6.10.3 Calculation of PTS, DTS ...........................................................................................................................................83

6.10.4 Restriction related to MPEG-2 T-STD ..........................................................................................................84

6.10.5 Packet field conversion rule ................................................................................................................................85

6.10.6 PSI Conversion rule ....................................................................................................................................................86

6.11 MMT service provisioning at conventional broadcast environment .....................................................87

6.12 Usage of multimedia configuration for interface switching management .......................................89

6.13 MMT signalling for multiple timed text assets .........................................................................................................89

6.13.1 Multiple timed text assets within an MMT presentation ...........................................................89

6.13.2 Selective spatial assignment for multiple timed text assets ....................................................90

6.13.3 Example of multiple timed text assets signalling in MMT .................. .......................................92

6.13.4 Carriage of TTML based timed text in MMT ..........................................................................................92

6.14 Viewport-dependent baseline media profile with packed streaming for VR ................................94

iv © ISO/IEC 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/IEC TR 23008-13:2020(E)

7 Application layer forward error correction (AL-FEC) .................................................................................................97

7.1 FEC decoding method for ssbg_mode2 ...........................................................................................................................97

7.1.1 General...................................................................................................................................................................................97

7.1.2 Source symbol block format for ssbg_mode2 ......................................................................................97

7.1.3 Regionalization of source symbol Block for FEC decoding ......................................................98

7.1.4 How to choose a proper unit of data for FEC decoding ............................................................102

7.2 Usage of two stage FEC coding structure ...................................................................................................................102

7.2.1 General................................................................................................................................................................................102

7.2.2 Use case: Hybrid content delivery ..............................................................................................................103

7.2.3 Use case: Streaming multicasting (or broadcasting) to two different end-

user groups which is under two different channel conditions each other ..............104

7.3 Usage of layer-aware FEC coding structure .............................................................................................................104

7.3.1 General................................................................................................................................................................................104

7.3.2 Use case 1: Layered multicast streaming ..............................................................................................105

7.3.3 Use case 2: Hybrid delivery ..............................................................................................................................106

7.3.4 Use case 3: Fast zapping with long time interleaving (LA-FEC UI) ................................107

7.3.5 Use case 4: Prioritized transmission ........................................................................................................107

7.4 MPU mapping to source packet block ...........................................................................................................................108

7.4.1 General................................................................................................................................................................................108

7.4.2 Aligned MPU mapping method to source packet block ............................................................108

7.5 FEC for hybrid service ................................................................................................................................................................109

7.6 Usage of rate-adaptive AL-FEC ............................................................................................................................................111

7.6.1 General................................................................................................................................................................................111

7.6.2 AL-FEC rate control .................................................................................................................................................112

7.7 FEC scheme for interleaved source symbol block ..............................................................................................115

7.7.1 General................................................................................................................................................................................115

7.7.2 Re-order buffer for interleaved source symbol block ................................................................115

8 MMT developments in mobile environments ..................................................................................................................115

8.1 True realtime video streaming over a lossy channel .......................................................................................115

8.1.1 General................................................................................................................................................................................115

8.1.2 Main features ................................................................................................................................................................115

8.1.3 Ring buffer in the client........................................................................................................................................116

8.1.4 FEC/deFEC performance and delay ..........................................................................................................116

8.1.5 Characteristics of UDP based multi-path and multi-session transmitting

for true real-time video streaming .............................................................................................................116

8.2 Dynamic asset change .................................................................................................................................................................119

8.3 Media adaptation for quality control .............................................................................................................................121

8.3.1 Use cases of QoS management for adaptive video service ....................................................121

8.3.2 Advanced adaptation operation of MMT entity: selective transmission ...................125

8.4 Transition time decision using MTR and MTN ......................................................................................................129

8.5 Usage of DRI and DSI message ............................................................................................................................................130

8.5.1 Overview ...........................................................................................................................................................................130

8.5.2 Operation in MMT sending entity or MANE .......................................................................................130

8.5.3 Operation in MMT receiving entity ............................................................................................................131

8.6 Usage of dynamic media resource identification information update ..............................................131

8.6.1 General................................................................................................................................................................................131

8.6.2 Classification of dynamic media resource allocation .................................................................131

8.6.3 Operation in MMT sending entity ...............................................................................................................131

8.6.4 Operation in MMT receiving entity ............................................................................................................132

8.6.5 Example operation in MANE proxy ...........................................................................................................132

8.7 MMT service list ...............................................................................................................................................................................134

8.8 Usage of DNS message for MMT URL resolution .................................................................................................135

8.8.1 General................................................................................................................................................................................135

8.8.2 Example on DNS resolution procedure ..................................................................................................135

8.9 Usage of guide information for dynamic media resource allocation ..................................................137

8.9.1 General................................................................................................................................................................................137

8.9.2 Classification of guide information ............................................................................................................137

8.9.3 Classification of dynamic media resource allocation .................................................................137

© ISO/IEC 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO/IEC TR 23008-13:2020(E)

8.9.4 Operation in MANEs ...............................................................................................................................................138

8.9.5 Operation in MMT sending entity ...............................................................................................................138

8.9.6 Example of dynamic media resource allocation using guide information ...............138

8.10 Usage of DARI for supporting DNS in MMT ..............................................................................................................139

8.10.1 General................................................................................................................................................................................139

8.10.2 Classification of DARI proxy .............................................................................................................................139

8.10.3 Operation in MANE DNS or DNS...................................................................................................................140

8.10.4 Operation in DARI proxy .....................................................................................................................................140

8.10.5 Relation between the media resource identification in MMT and DNS

message .............................................................................................................................................................................140

Bibliography ...................................................................................................................................

...

TECHNICAL ISO/IEC TR
REPORT 23008-13
Third edition
Information technology — High
efficiency coding and media delivery
in heterogeneous environments —
Part 13:
MMT implementation guidance
PROOF/ÉPREUVE
Reference number
ISO/IEC TR 23008-13:2020(E)
ISO/IEC 2020
---------------------- Page: 1 ----------------------
ISO/IEC TR 23008-13:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO/IEC 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC TR 23008-13:2020(E)
Contents Page

Foreword ......................................................................................................................................................................................................................................vii

Introduction ................................................................................................................................................................................................................................ix

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General overview of MPEG media transport ........................................................................................................................... 1

4.1 System overview .................................................................................................................................................................................... 1

4.2 Tools specified in ISO/IEC 23008-1 ...................................................................................................................................... 2

5 MMT function deployments ...................................................................................................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Object reconstruction ........................................................................................................................................................................ 3

5.2.1 General...................................................................................................................................................................................... 3

5.2.2 Recovery in MPU mode .............................................................................................................................................. 4

5.2.3 Recovery in GFD mode ................................................................................................................................................ 6

5.3 Default assets ........................................................................................................................................................................................... 6

5.4 Low-delay live streaming ............................................................................................................................................................... 7

5.5 Parallel processing in MMT sending and receiving entities ............................................................................. 9

5.5.1 Processing in MMT sending entity ................................................................................................................... 9

5.5.2 Processing in MMT receiving entity .............................................................................................................11

5.6 MPU streaming for live services ............................................................................................................................................13

5.6.1 MPU packetization.......................................................................................................................................................13

5.6.2 Sending of MPU and signalling message ..................................................................................................16

5.6.3 MPU generation for SHVC-encoded video in real-time streaming .....................................17

5.7 Fast MMT session acquisition .................................................................................................................................................19

5.8 Referencing and processing non-timed data .............................................................................................................20

5.8.1 General...................................................................................................................................................................................20

5.8.2 Resource grouping and referencing .............................................................................................................20

5.8.3 Receiver handling .........................................................................................................................................................21

5.9 Media adaptation for quality control in MMTP ........................................................................................................21

5.9.1 General...................................................................................................................................................................................21

5.9.2 Parameters for media adaptation ..................................................................................................................21

5.9.3 Adaptation operation of MMT entity ...........................................................................................................21

5.10 Hybrid delivery in MMT ...............................................................................................................................................................22

5.10.1 General...................................................................................................................................................................................22

5.10.2 Classification of hybrid delivery ......................................................................................................................22

5.10.3 Technical elements for hybrid delivery .....................................................................................................23

5.11 Example of detailed implementation of MMT ...........................................................................................................24

5.11.1 Use case: Combination of MMT and MPEG-2 TS for synchronized presentation .24

5.11.2 Use case: Combination of MMT and HTTP streaming for synchronized

decoding ...............................................................................................................................................................................24

5.11.3 Use case: Content request in advance for synchronized play-out ......................................25

5.12 HRBM signalling for hybrid delivery .................................................................................................................................26

5.12.1 Hybrid delivery from the single MMT sending entity ...................................................................26

5.12.2 Hybrid delivery from the multiple MMT sending entities ........................................................27

5.13 Error resilience in MMT protocol ........................................................................................................................................29

5.14 Delay constrained ARQ .................................................................................................................................................................30

5.14.1 General...................................................................................................................................................................................30

5.14.2 Delivery-time constrained ARQ........................................................................................................................30

5.14.3 Arrival-deadline constrained ARQ .................................................................................................................31

5.15 Delivery of encrypted MPUs .....................................................................................................................................................33

5.16 HRBM message updating ............................................................................................................................................................33

5.16.1 General...................................................................................................................................................................................33

© ISO/IEC 2020 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO/IEC TR 23008-13:2020(E)

5.16.2 HRBM message sending schedule ..................................................................................................................34

5.16.3 Use case.................................................................................................................................................................................34

5.16.4 HRBM buffer operation in unicast environment ...............................................................................35

5.17 MMTP packet with padded data ...........................................................................................................................................37

5.18 Constraints on signalling splicing points ......................................................................................................................39

5.18.1 General...................................................................................................................................................................................39

5.18.2 Constraints on Case 1 – Asset change at the start of MPU ........................................................39

5.18.3 Constraints on Case 2 – Asset change at a point in MPU ............................................................39

5.18.4 Signal the splicing point for target assets in Case 1 and Case 2 ...........................................40

6 Use cases for MMT deployment ..........................................................................................................................................................40

6.1 General ........................................................................................................................................................................................................40

6.2 Delivery of DASH presentations using MMT ..............................................................................................................40

6.2.1 General...................................................................................................................................................................................40

6.2.2 Delivery of the MPD ........................................................................................................................................... .........41

6.2.3 Delivery of the data segments ...........................................................................................................................41

6.3 Client operation for DASH service delivered through MMT protocol ...................................................42

6.3.1 Delivery of MPD with MMTP ..............................................................................................................................42

6.3.2 Delivery and consumption of DASH segments with MMTP .....................................................42

6.4 Hybrid of MMT and DASH over heterogeneous network ................................................................................44

6.5 MMT caching for effective bandwidth utilization ..................................................................................................45

6.5.1 Overview of MMT caching middlebox architecture ........................................................................45

6.5.2 Content-based caching of MMT media .......................................................................................................46

6.5.3 MPU sync protocol between server and caching middlebox ..................................................48

6.5.4 MMT cache manifest ..................................................................................................................................................53

6.6 Usage of ADC signalling message .........................................................................................................................................55

6.6.1 General...................................................................................................................................................................................55

6.6.2 Operation in MMT sending entity ..................................................................................................................55

6.6.3 Operation in MANE router ...................................................................................................................................55

6.6.4 Example operation in MMT-receiving entities ....................................................................................55

6.6.5 QoE multiplexing gain and bottleneck coordination .....................................................................55

6.7 MMT deployment in Japanese broadcasting systems ........................................................................................58

6.7.1 General...................................................................................................................................................................................58

6.7.2 Broadcasting systems using MMT .................................................................................................................59

6.7.3 Media transport protocol ......................................................................................................................................61

6.7.4 Signalling information..............................................................................................................................................66

6.7.5 Start-up procedure of broadcasting service .................. ........................................................................74

6.7.6 Actual packet structure ...........................................................................................................................................77

6.8 MMT deployment in ATSC 3.0 systems ...........................................................................................................................79

6.9 Implementation of MMT based on D-TMB in China .............................................................................................81

6.9.1 Background........................................................................................................................................................................81

6.9.2 MMT over legacy DTMB infrastructure .....................................................................................................81

6.9.3 Use cases ..............................................................................................................................................................................81

6.10 Conversion of MMTP stream to MPEG-2 TS ................................................................................................................83

6.10.1 Overview of conversion operation ................................................................................................................83

6.10.2 Restrictions to MMTP packets ...........................................................................................................................83

6.10.3 Calculation of PTS, DTS ...........................................................................................................................................83

6.10.4 Restriction related to MPEG-2 T-STD ..........................................................................................................84

6.10.5 Packet field conversion rule ................................................................................................................................85

6.10.6 PSI Conversion rule ....................................................................................................................................................86

6.11 MMT service provisioning at conventional broadcast environment .....................................................87

6.12 Usage of multimedia configuration for interface switching management .......................................89

6.13 MMT signalling for multiple timed text assets .........................................................................................................89

6.13.1 Multiple timed text assets within an MMT presentation ...........................................................89

6.13.2 Selective spatial assignment for multiple timed text assets ....................................................90

6.13.3 Example of multiple timed text assets signalling in MMT .................. .......................................92

6.13.4 Carriage of TTML based timed text in MMT ..........................................................................................92

6.14 Viewport-dependent baseline media profile with packed streaming for VR ................................94

iv PROOF/ÉPREUVE © ISO/IEC 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/IEC TR 23008-13:2020(E)

7 Application layer forward error correction (AL-FEC) .................................................................................................97

7.1 FEC decoding method for ssbg_mode2 ...........................................................................................................................97

7.1.1 General...................................................................................................................................................................................97

7.1.2 Source symbol block format for ssbg_mode2 ......................................................................................97

7.1.3 Regionalization of source symbol Block for FEC decoding ......................................................98

7.1.4 How to choose a proper unit of data for FEC decoding ............................................................102

7.2 Usage of two stage FEC coding structure ...................................................................................................................102

7.2.1 General................................................................................................................................................................................102

7.2.2 Use case: Hybrid content delivery ..............................................................................................................103

7.2.3 Use case: Streaming multicasting (or broadcasting) to two different end-

user groups which is under two different channel conditions each other ..............104

7.3 Usage of layer-aware FEC coding structure .............................................................................................................104

7.3.1 General................................................................................................................................................................................104

7.3.2 Use case 1: Layered multicast streaming ..............................................................................................105

7.3.3 Use case 2: Hybrid delivery ..............................................................................................................................106

7.3.4 Use case 3: Fast zapping with long time interleaving (LA-FEC UI) ................................107

7.3.5 Use case 4: Prioritized transmission ........................................................................................................107

7.4 MPU mapping to source packet block ...........................................................................................................................108

7.4.1 General................................................................................................................................................................................108

7.4.2 Aligned MPU mapping method to source packet block ............................................................108

7.5 FEC for hybrid service ................................................................................................................................................................109

7.6 Usage of rate-adaptive AL-FEC ............................................................................................................................................111

7.6.1 General................................................................................................................................................................................111

7.6.2 AL-FEC rate control .................................................................................................................................................112

7.7 FEC scheme for interleaved source symbol block ..............................................................................................115

7.7.1 General................................................................................................................................................................................115

7.7.2 Re-order buffer for interleaved source symbol block ................................................................115

8 MMT developments in mobile environments ..................................................................................................................115

8.1 True realtime video streaming over a lossy channel .......................................................................................115

8.1.1 General................................................................................................................................................................................115

8.1.2 Main features ................................................................................................................................................................115

8.1.3 Ring buffer in the client........................................................................................................................................116

8.1.4 FEC/deFEC performance and delay ..........................................................................................................116

8.1.5 Characteristics of UDP based multi-path and multi-session transmitting

for true real-time video streaming .............................................................................................................116

8.2 Dynamic asset change .................................................................................................................................................................119

8.3 Media adaptation for quality control .............................................................................................................................121

8.3.1 Use cases of QoS management for adaptive video service ....................................................121

8.3.2 Advanced adaptation operation of MMT entity: selective transmission ...................125

8.4 Transition time decision using MTR and MTN ......................................................................................................129

8.5 Usage of DRI and DSI message ............................................................................................................................................130

8.5.1 Overview ...........................................................................................................................................................................130

8.5.2 Operation in MMT sending entity or MANE .......................................................................................130

8.5.3 Operation in MMT receiving entity ............................................................................................................131

8.6 Usage of dynamic media resource identification information update ..............................................131

8.6.1 General................................................................................................................................................................................131

8.6.2 Classification of dynamic media resource allocation .................................................................131

8.6.3 Operation in MMT sending entity ...............................................................................................................131

8.6.4 Operation in MMT receiving entity ............................................................................................................132

8.6.5 Example operation in MANE proxy ...........................................................................................................132

8.7 MMT service list ...............................................................................................................................................................................134

8.8 Usage of DNS message for MMT URL resolution .................................................................................................135

8.8.1 General................................................................................................................................................................................135

8.8.2 Example on DNS resolution procedure ..................................................................................................135

8.9 Usage of guide information for dynamic media resource allocation ..................................................137

8.9.1 General................................................................................................................................................................................137

8.9.2 Classification of guide information ............................................................................................................137

8.9.3 Classification of dynamic media resource allocation .................................................................137

© ISO/IEC 2020 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
ISO/IEC TR 23008-13:2020(E)

8.9.4 Operation in MANEs ...............................................................................................................................................138

8.9.5 Operation in MMT sending entity ...............................................................................................................138

8.9.6 Example of dynamic media resource allocation using guide information ...............138

8.10 Usage of DARI for supporting DNS in MMT ..............................................................................................................139

8.10.1 General................................................................................................................................................................................139

8.10.2 Classification of DARI proxy .............................................................................................................................139

8.10.3 Operation in MANE DNS or DNS...................................................................................................................140

8.10.4 Operation in DARI proxy .....................................................................................................................................140

8.10.5 Relation between the media resource identification in MMT and DNS

message .............................................................................................................................................................................140

Bibliography .........................................................................

...

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