Annex 1 to AVC-598R

Documents for the Daejeon/Seoul meeting
(27 October - 5 November 1993)

Normal Documents

AVC number	MPEG93/???	Pur-pose	
Title (Source)	
AVC-578R	880	R	Report of the thirteenth Experts Group meeting in Brussels (September 2-10, 1993) - Part I and Part II (Rapporteur)	
AVC-579R	-	R	Report of the thirteenth Experts Group meeting in Brussels (September 2-10, 1993) - Part III (Rapporteur)	
AVC-580	N0532	R	Fourth Working Draft - Video (WD Editing Committee)	
AVC-581	-	I/D	Additional comments on video combining from 4QCIFs to CIF (Bellcore)	
AVC-582	N0531	R	Fourth Working Draft - Systems (WD Editing Committee)	
AVC-583	-	R	Meeting report - Part 1 (Working Party 1/15)	
AVC-584	-	R	Guidance to the Rapporteur for the study of video coding and systems in ATM and other network environments (Chairman of Working Party 1/15)	
AVC-585	931	D	ATM network adaptation performance parameters (Australian UVC consortium)	
AVC-586	-	R	Report of Discussion group on MPEG-2 Systems and ATM (Stuart Dunstan)	
AVC-587	-	D	Packetisation of H.221 frames for LANs (Australian UVC consortium)	
AVC-588	940	P	Modification to VBV for VBR in WD is incorrect (AT&T)	
AVC-589	-	P	Field trial of H.32X ATM video codec interconnection (Japan)	
AVC-590	-	P	Picture format for H.32X (Japan)	
AVC-591	898	D	Comments on vbv_delay description in variable bitrate operation (Japan)	
AVC-592	-	I	Bitrate representation for VBR operation for ATM transmission (Japan)	
AVC-593	-	P	AAL for hardware verification (Japan)	
AVC-594	958	D	Cell loss correction method for MPEG 2 System Streams transmission (Japan)	
AVC-595	-	D	Video and audio communication system for CSMA/CD LAN (NTT)	
AVC-596	885	I	Clarification for the use of VBV for low delay applications (BT)	
AVC-597	884	P	Proposal for modified syntax, semantics and decoding process for spatial scalability (BT)	

Abstract

[???] indicates MPEG Document Number MPEG93/???.

AVC-578R	[880]	Report of the thirteenth Experts Group meeting in Brussels (September 		2-10, 1993) - Part I and Part II (Rapporteur)

This document records the outcome of the Brussels sole sessions held in July 1993.

AVC-579R	[-]	Report of the thirteenth Experts Group meeting in Brussels (September 		2-10, 1993) - Part III (Rapporteur)

This document records the outcome of the Brussels joint sessions held in July 1993, covering Requirements, Video, Implementation Study and Systems sub-groups.

AVC-580	[N0532]	Fourth Working Draft - Video (WD Editing Committee)

This document gives frozen specifications for video coding part which were updated at the Brussels meeting.

AVC-581	[-]	Additional comments on video combining from 4QCIFs to CIF
		(Bellcore)

The second approach to achieve asynchronous video channels by reducing the operational transfer rate in a full capacity is described.  An implementation example by use of this second approach is reported.  Some clarifications are also given to the misunderstanding contained in the Brussels output report on this matter.  It is concluded that the Experts Group should not recommend either of the video combiner and transcoding approaches, but leave the choice to the market since both can co-exist.

AVC-582	[N0531]	Fourth Working Draft - Systems (WD Editing Committee)

This document gives frozen specifications for systems coding part which were updated at the Brussels meeting.

AVC-583	[-]	Meeting report - Part 1 (Working Party 1/15)

This document gives the outcome of the first WP1/15 meeting in this study period which made progress, among other things, in clarifying the standardization plan in the area of audiovisual communication systems.  It also gave guidance to the work of this Experts Group which is now in charge of drafting Recommendations for video coding as well as systems aspects.

AVC-584	[-]	Guidance to the Rapporteur for the study of video coding and systems 		in ATM and other network environments 
		(Chairman of Working Party 1/15)

The work area and the work methods of the Experts Group have been redefined eith the following target Recommendations;

H.26X	Video coding for ATM environments	
H.22X	Multimedia multiplex and synchronization for ATM environments	
H.32X	Broadband audiovisual communication (or visual telephone?) systems and terminal equipment	
H.32Y	Adaptation of H.320 terminals to B-ISDN	
H.32Z	Adaptation of H.320 terminals to LANs	

AVC-585	[931]	ATM network adaptation performance parameters
		(Australian UVC consortium)

This document discusses performance parameters in ATM network adaptation of real time audio and video signals with respect to delay, error performance, and packing efficiency.  "Pipelining" and "user data alignment" modes of operation are considered.  Two network adaptation modes of operation are discussed; one is based upon AAL type 3/4 SAR and the other is based on MPEG-2 Systems Transport Stream.  It is concluded that the former outperfoms the latter, particularly if the bit rate is low.

AVC-586	[-]	Report of Discussion group on MPEG-2 Systems and ATM
		(Stuart Dunstan)

Correspondence work after the Brussels meeting is reported which has addressed identifying a suitable interworking point for MPEG-2 systems on packet oriented networks.  It is pointed out that a clear statement is required on the use of PES without support of PS or TS.  Functionalities and their allocation in the network adaptation is the issue.

AVC-587	[-]	Packetisation of H.221 frames for LANs (Australian UVC consortium)

A means of adapting H.320 terminals for use on packet switched LANs, in which the H.221 frame structure is retained, is discussed with respect to protocol stack, H.221 multiplexed data alignment with the packet, packet size, impact of a packet loss and timing recovery.  The advantage of this approach is the maximum use of exiting component/equipment, but the subjective impact of packet loss is unknown, requiring further study.

AVC-588	[940]	Modification to VBV for VBR in WD is incorrect (AT&T)

It is proposed that the definition of vbv_delay and bit_rate for VBR should be reverted back to "3FFFFFFF" and "FFFF", because the current definition can not be satisfied by the encoder.  It is reminded that correct operation of a video decoder in the case of VBR can be ensured at the systems layer.

AVC-589	[-]	Field trial of H.32X ATM video codec interconnection (Japan)

In order to make effective the field trial which is planned in the middle of 1995,  it is proposed that many members in the Experts Group should give their planned specifications of the experimental codecs for the basis of further discussions.  An example of codec specifications is provided as a stimulus for further consideration.

AVC-590	[-]	Picture format for H.32X (Japan)

It is proposed that H.32X picture formats should include respective local formats for high quality intra-regional services and some mandatory common format(s) for inter-regional communications.

AVC-591	[898]	Comments on vbv_delay description in variable bitrate operation
		(Japan)

It is suggested to add description indicating that the delay needed to start decoding in VBR operation should be calculated from the vbv_delay and bit_rate values and that the illustration should be modified to correspond to a realistic case.  It is also raised whether indication to distinguish CBR and VBR is needed, and possible solutions are provided. 

AVC-592	[-]	Bitrate representation for VBR operation for ATM transmission (Japan)

Implications of the current definition of bit rate for VBR are considered in the light of ATM network VBR services.  It is hinted that traffic descriptors at the user/network interface may be rather loosely coupled with this VBR bit rate definition.

AVC-593	[-]	AAL for hardware verification (Japan)

This document first discusses error strategy for the H.22X/AAL and indicates a choice for a given network QoS in terms of bit error and cell loss characteristics.  Then, several alternative solutions for H.22X/AAL are compared regarding packetizing delay, packing efficiency, implementation, error recovery time.  Finally two service classes are assumed; one for higher transmission efficiency and easy implementation and another for high quality.  In conclusion, it is suggested to take the first service and employ AAL type 5 or AAL type 1 (cell interleave) for the hardware trial being planned.

AVC-594	[958]	Cell loss correction method for MPEG 2 System Streams transmission 		(Japan)

The following two methods are provided for discussion to deliver TS packets over ATM networks with its alignment with ATM cells;

	• AAL Type 1: use of RS(192,190) and CRC for a group of 47 TS packets
	• AAL new Type: use of RS(4m+4,4m) and CRC for a group of m TS packets

AVC-595	[-]	Video and audio communication system for CSMA/CD LAN (NTT)

Information is provided on an implementation of audiovisual communication system over CSMA/CD LAN which uses H.261 and G.728 source coding but packet multiplex and Internet protocol TCP/IP and UDP/IP.  A design of gateway between LAN and N-ISDN is also informed.

AVC-596	[885]	Clarification for the use of VBV for low delay applications (BT)

This document provides information on the use and operation of VBV in low delay mode applications and rationales for use of skipped pictures after a "big picture"; to keep low steady state delay by occasionally allowing temporal distortion.

AVC-597	[884]	Proposal for modified syntax, semantics and decoding process for 
		spatial scalability (BT)

This document provides the syntax, semantics and decoding process used for bitstream exchange for spatial scalability.  It is proposed to replace the current WD text with this description.

Temporary Documents

TD-1	Rapporteur	Agenda for the sole sessions	
TD-2	Rapporteur	Available documents for the Daejeon/Seoul meeting	
TD-3	Rapporteur	List of tape demonstrations	
TD-4	Rapporteur	List of open issues - October 1993	
TD-5	Rapporteur	Network adaptation functions and their allocation to different layers	
TD-6	S. Okubo	Organization of ITU-T SG15 (1993-1996)	
TD-7	ITU-T SG15 EG	Spatial scalability when the base layer includes picture skipping	
TD-8	ITU-T SG15 EG	Decoding start-up algorithm for VBR coded bitstream	
TD-9	T. Tanaka	Clarification for AVC-581 and a comment	
TD-10	S. Dunstan	Report of meeting to discuss ATM Network Adaptation - H.22X/AAL	
TD-11	ITU-T SG15 EG	Use of Packetized Elementary Stream as an interface point	
TD-12	Rapporteur	Draft report of the Daejeon sole sessions	

END