Annex 1 to AVC-578R

Documents for the Brussles meeting (2-10 September 1993)

Normal Documents

AVC number	MPEG93/???	Pur-pose	
Title (Source)	
AVC-552	N0491	R	Test Model 6 (Test Model Editing Committee)	
AVC-553R	802	R	Report of the twelfth meeting in Boston and New York (July 7-16, 1993) - Part I and Part II (Chairman)	
AVC-554R	802	R	Report of the twelfth meeting in Boston and New York (July 7-16, 1993) - Part III (Chairman)	
AVC-555	N0502	R	Third Working Draft - Video (WD Editing Committee)	
AVC-556	N0501	R	Third Working Draft - Systems (WD Editing Committee)	
AVC-557	-	R	Liaison statements to SG15 Experts Group for ATM Video Coding (SG13)	
AVC-558	-	R	Report of drafting meeting on the Terms of Reference for JCG on B-ISDN (D. Dorman)	
AVC-559	-	D	Comments on Bellcore continuous presence multipoint proposal (BT)	
AVC-560	-	I/D	Some comments on video combining from 4 QCIFs to CIF (Bellcore)	
AVC-561	-	P	Proposal for work plan of ITU-T WP1/15 (BT)	
AVC-562	747	I	Experiments on asynchronous video clock (Japan)	
AVC-563	748	P/D	Modification to the current VBV specification (Japan)	
AVC-564	-	D	Backward compatibility with H.261 using NEXT Profile (Japan)	
AVC-565	746	D	Problems in Data Partitioning (Japan)	
AVC-566	-	P	Proposal for field trial of H.32X ATM video codec (Japan)	
AVC-567	749	D	Bit error consideration on H.22X/AAL (Japan)	
AVC-568	750	D	MPEG2 Transport packet transmission over ATM (Japan)	
AVC-569	751	D	Consideration on the diagonal interleaving method for cell loss correction (Japan)	
AVC-570	730	P	PES packet length semantics (Siemens)	
AVC-571	-	P	H.261 backward compatibility (Telecom Australia)	
AVC-572	-	P	Proposal for a profile incorporating minimum complexity scalability (Telecom Australia)	
AVC-573	745		The effect of up-sampling on two-layered coding (BT?)	
AVC-574	787	I	NEXT Profile Level Parameters for 4:2:0 formats (PTT Research)	
AVC-575	-		Video Coding Aspects of the Bellcore 4 QCIF to CIF mixing proposal (PTT Research)	
AVC-576	-	D/I	Error resilience based on Data Partitioning (BELGACOM, UCL)	
AVC-577	-	P	Data partitioning addition to Working Draft (DSRC)	

Abstracts

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

AVC-552	[N0491]	Test Model 6 (Test Model Editing Committee)

Three remaining experiments are described, optimization of the upconversion filter for spatial scalability, optimization of macroblock type tables for scalability, and verification of temporal scalability.

AVC-553R	[802]	Report of the twelfth meeting in Boston and New York (July 7-16, 1993) - Part I 		and Part II (Chairman)

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

AVC-554R	[802]	Report of the twelfth meeting in Boston and New York (July 7-16, 1993) - 
		Part III (Chairman)

This document records the outcome of the joint sessions with MPEG held in New York in July 1993.

AVC-555	[N0502]	Third Working Draft - Video (WD Editing Committee)

This document gives frozen specifications for video coding part which were obtained at the New York meeting.

AVC-556	[N0501]	Third Working Draft - Systems (WD Editing Committee)

This document gives frozen specifications for systems coding part which were obtained at the New York meeting.

AVC-557	[-]	Liaison statements to SG15 Experts Group for ATM Video Coding (SG13)

This document contains the following liaison statements from SG13 which met during 5-16 July 1993 in Geneva;

•	Open issues for AAL Type 1 timing recovery; impacts of Plesiochronous Network Operation, jitter absorbing capability of the Adaptive Clock method
•	SG13's choice of the error correction method for delay sensitive signal transport of AAL Type 1 and an open issue - selection of the polynomial
•	continuation of IVS Baseline Document activities

AVC-558	[-]	Report of drafting meeting on the Terms of Reference for JCG on B-ISDN 
		(D. Dorman)

Mandate, working methods, terms of reference, issues of immediate attention, etc., are described for a new joint coordination group "JCG on B-ISDN".  Annex contains the release time table for B-ISDN standardization as a management tool for aligning B-ISDN related Recommendations.

AVC-559	[-]	Comments on Bellcore continuous presence multipoint proposal (BT)

The method of achieving 2x2 split-screen continuous presence multipoint videoconferencing is commented with respect to use of fill bit, full screen display of pictures coded at 20 kbit/s, picture quality, delay, implementation cost of header manipulation etc. other than pure picture coding, impacts of picture dropping, video clock synchronization among remote terminals, use of existing terminals.  It is concluded that the technique is not yet proven and may always suffer from disadvantages compared to the pel domain combining method.

AVC-560	[-]	Some comments on video combining from 4 QCIFs to CIF (Bellcore)

The following is presented;

•	There is a tradeoff between adding more MCU delay and violating the HRD sooner.
•	Frame synchronization can be maintained by mapping input QCIF Temporal Reference on to regular output CIF Temporal Reference with a certain rule.
•	Comparison between video combining and transcoding should carefully be studied in terms of picture quality, delay increase, cost and system complexity.

AVC-561	[-]	Proposal for work plan of ITU-T WP1/15 (BT)

Taking into account of uncertainty in ATM network performance and timescales, a dearth of real and viable applications, and increasing number of customers asking for H.320 over LANs, this document proposes that H.320 over LANs become a prime focus for the work of SG15 to meet the shorter term needs.

AVC-562	[747]	Experiments on asynchronous video clock (Japan)

Measurement and observation results are reported for asynchronous operation of a set of hardware HDTV coder and decoder where the decoder clock frequency is 10/20/30 ppm higher than the encoder one.  A field slip appears as one-line downward or upward shift of the reproduced picture.  Based on the fact that this one-line shift is seldom visible, it is concluded that asynchronous operation is of some practical use.

AVC-563	[748]	Modification to the current VBV specification (Japan)

For 3:2 pulldown VBV operation, a missing specification is provided for the data removal timing at the start of sequence using vbv_delay values.  A note for attention is also given for the coding of number_of_field_display_code at M > 1.

AVC-564	[-]	Backward compatibility with H.261 using NEXT Profile (Japan)

Necessary provisions are discussed to implement H.261 backward compatibility by using the spatial scalability in Next Profile; parameter setting in the video syntax, layer indication in the H.22X multimedia multiplex, H.24X capability exchange for the combination of upper layer and lower layer.  Some video issues are also listed; VBV, 5 bit TR in H.261, upsampling filter description and indication of progressive/interlace and chroma format for the lower layer.  It is concluded that at least he following should be clarifies;

•	handling of picture skipping in the lower layer,
•	VBV specifications for the upper layer,
•	identification of the layer by Systems.

AVC-565	[746]	Problems in Data Partitioning (Japan)

Three alternatives for Data Partitioning syntax are compared; 1) DP elements in Sequence, Picture and Slice headers, 2) Extension syntax, 3) Informative description.  Necessity of fine rate control in each layer leads to the first alternative.  This document also points out possible start code emulation for which inhibition of the layer consisting of priority class 4 is concluded as the most reasonable.  Issues of VBV_delay and bit_rate are also raised.

AVC-566	[-]	Proposal for field trial of H.32X ATM video codec (Japan)

A field trial of H.32X terminal interconnection through ATM transmission lines is proposed to verify related draft Recommendations and to encourage early development of such products.  Middle of 1995 is suggested for performing the field trial.  Specifications looking at the early realistic applications and test methods needing special tools for ATM transmission are also discussed.

AVC-567	[749]	Bit error consideration on H.22X/AAL (Japan)

Impacts of bit error are raised to reconsider H.22X/AAL for audiovisual services.  Three strategies are discussed; 1) bit error detection and cell loss detection, 2) bit error correction and cell loss detection, 3) bit error correction and cell loss correction.  A suggestion is given that the second strategy is preferable to the first one in some situations, though the Boston discussion was based on the first strategy.

AVC-568	[750]	MPEG2 Transport packet transmission over ATM (Japan)

The following four methods are compared for transmission of TS packets over an ATM link;

•	Byte/bit data transfer (bit pipe approach, AAL Type 1)
•	structured data transfer (bit pipe approach, AAL Type 1)
•	FEC and interleaving (bit pipe approach, AAL Type 1)
•	alignment between a TS packet and ATM cells (packet approach, AAL Type 0 or new Type)

It is concluded that the third method would be a good solution if cell loss correction is necessary but the fourth method if bit error correction is sufficient.

AVC-569	[751]	Consideration on the diagonal interleaving method for cell loss correction 		(Japan)

This document discusses the use of Reed-Solomon code and interleaving for cell loss and/or bit error correction and proposes the following for AAL options;

•	RS(94,88) and diagonal interleaving with ring buffer (SG13 proposal) for the lowest delay - bit by bit delivery,
•	the same as above but with double buffer for application to the "stop-go" VBR operation - 752 Byte packet delivery,
•	RS(192,188) and vertical interleaving for TS packets - 192x47 Byte packet delivery.

AVC-570	[730]	PES packet length semantics (Siemens)

In order to achieve low delay, zero value of PES_packet_lentgh is proposed to be unspecified even if it is used without support from either the Program Stream or Transport Stream.  It is also proposed that this should be true for any elementary streams.

AVC-571	[-]	H.261 backward compatibility (Telecom Australia)

Due to the spatial scalable solution constraining the upper layer coding and other reasons, it is proposed that the ATM Video Coding Experts Group adopt a switchable/simulcast strategy to provide interworking between H.32X and H.320 terminals in those situation or at those times when this is required.

AVC-572	[-]	Proposal for a profile incorporating minimum complexity scalability 
		(Telecom Australia)

Considering that full support of Next Profile functionalities may be costly, this document proposes definition of a minimum scalability profile, incorporating those features currently in Main Profile, but also allowing 2-layer SNR scalability.

AVC-573	[745]	The effect of up-sampling on two-layered coding (BT)

Experimental results are reported for comparison between the TM up-sampling filtering and linear interpolation.  It is concluded that the up-sampling filtering process for the lower layer coded picture in a two-layer coder can be simplified to linear interpolation without any significant effect on the upper layer picture quality.

AVC-574	[787]	NEXT Profile Level Parameters for 4:2:0 formats (PTT Research)

Taking into account that the processing power and memory size do not differ between luminance and chrominance pels, this document suggests that the level parameter should address total pixel rate (= luminance pixel rate + chrominance pel rate).  It is also suggested that the level parameters for Next Profile should make distinction between 4:2:2 and 4:2:0 since progressive pictures are effective for high quality videoconferencing.

AVC-575	[-]	Video Coding Aspects of the Bellcore 4 QCIF to CIF mixing proposal 
		(PTT Research)

This document summarizes various comments to the Bellcore 4 QCIF to CIF video mixing proposal in AVC-500 and 501 which were obtained through correspondence.  The comments cover questions to be answered, service aspects, approaches to the continuous presence multipoint system, impact on equipment, buffering and delay, picture quality, etc.  It is concluded that the proposed method is simple in its basics and does not degrade picture quality, but there are some drawbacks.

AVC-576	[-]	Error resilience based on Data Partitioning (BELGACOM, UCL)

Experimental results for cell loss resilience are reported for two different sets of PBP in terms of information splitting ratio and picture quality.  It is raised whether we want the PBP information included in the H.26X bitstream at the slice level to allow constant bit rate mode in each of the two layers.

AVC-577	[-]	Data partitioning addition to Working Draft (DSRC)

This document proposes syntax and other descriptions for the use of Data Partitioning.

Temporary Documents

TD-1	Chairman	Agenda for the sole sessions	
TD-2	Chairman	Available documents for the Brussels meeting	
TD-3	Chairman	List of tape demonstrations	
TD-4	Chairman	List of open issues - August 1993	
TD-5	Chairman	Fifth progress report of the Experts Group (Draft)	
TD-6	S. Okubo	ITU-T approval process for Recommendation H.26X|MPEG-2 Standard (MPEG93/752)	
TD-7	Chairman	Skeleton of Recommendation H.32X	
TD-8	K. Sakai	Supplements to AVC-563	
TD-9	Chairman	Agreements	
TD-10	Chairman	Video coding aspects of the Bellcore 4 QCIF to CIF  mixing proposal	
TD-11	Chairman	Agreements and actions (substitute of the meeting report)	

END