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Annex 8 to Doc. AVC-65R
Annex 8 to Doc. AVC-65R

INPUT TO THE JOINT SESSIONS WITH MPEG

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INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANIZATION INTERNATIONALE DE NORMALISATION

ISO-IEC JTC1/SC2/WG11

CODING OF MOVING PICTURES AND ASSOCIATED AUDIO INFORMATION

								ISO-IEC JTC1/SC2/WG11
								MPEG91/60      
								May 27, 1991

Title  : Discussion results of the second meeting in Paris
Source : CCITT Experts Group for ATM Video Coding
Purpose: Report/Proposal 

The experts Group for for ATM Video Coding held its independent sessions of 
the second meeting at CNET during May 23-24.  Here are described a brief 
report of those sessions and some points for consideration of the joint 
sessions.

1. Report

We have discussed mainly on the following items;

   a.	Report of the meetings relevant to the Experts Group: CCITT SGXV, 
SGXVIII, TG CMTT/2, MPEG
   b.	Picture format, particularly possibility of a single format for the 
high quality video coding
   c.	Framework for H.26X: requirements and video coding architecture, cell 
loss consideration, layered coding
   d.	VBR vs CBR: comparison study in picture quality and network usage, 
statistical multiplex gain, network model
   e.	Video coding algorithms: new coding elements
   f.	Compatibility issue: definition, specific methods using H.261/MPEG1 as 
the base layer
   g.	Multimedia multiplexing: Cell based multiplexing as a reference
   h.	Network issues: coordination in SGXVIII, clarification of network 
characteristics

2. Requirements for the high quality video coding standard

We propose the following items be included in the requirements for the high 
quality video coding standard;

   a.	Resilience for cell loss encountered in ATM networks
   b.	Short coding/decoding delay (≦～150ms) for conversational services
   c.	Multipoint consideration taking into account the B-ISDN capabilities 
such as listed in §3/AVC-37
   d.	Intraframe codec which uses only intra mode be allowed 
(see §3/AVC-51) 
   e.	Provision for backward/forward compatibility and adaptability to 
future extension by means of syntax structure (see §4/AVC-51) or 
additional bit stream component 
   f.	When compatible coding is tested, the base layer bit rate should be 
set as guidance to a value lower than the primary rate (1.5/2 Mbit/s), 
otherwise there is no way to transport the base layer for 
interworking with the existing systems.

3. Test sequences of progressively scanned materials

We propose to consider provision of progressively scanned test materials.  
There may be a danger that coding algorithms are optimized only for 
interlaced materials.

4. Definition of terms concerning the compatibility issue

We recommend the terminology contained in AVC-32 be used for the discussion 
of compatibility issue, where the following terms are defined;

    -	Upward/downward, forward/backward compatibilities
    -	Methods to implement the compatibility - simulcasting, embedded bit 
stream, syntactic extension, switchable encoder, standard families

5. Representatives to MPEG Sub-groups

The following persons act as representative of the Experts Group in the 
joint session with the MPEG sub-group:

	MPEG-VIDEO 			G. Bjoentegaard
MPEG-SYSTEM 			B.G. Haskell
MPEG-REQUIREMENTS 		S. Okubo
MPEG-TESTS 			S. Okubo
MPEG-IMPLEMENTATION 		D.G. Morrison

6. Documents submitted from the Experts Group

The following 8 documents are submitted for information and discussion 
purposes;

AVC-30 (MPEG91/078) IMPROVEMENTS OF HYBRID DCT CODING (NORWAY)
AVC-32 (MPEG91/081) COMPATIBILITY METHODS FOR VIDEO CODING SYSTEMS 
                    (THE NETHERLANDS, FRG, NORWAY, ITALY, UK, SWEDEN, FRANCE,
                     BELGIUM)
AVC-33 (MPEG91/051) SET UP OF CCIR 601 MULTI-PURPOSE CODING SCHEME 
                    (PTT RESEARCH, THE NETHERLANDS) 
AVC-34 (MPEG91/079) FRAMEWORK FOR STANDARDISATION OF VIDEO SERVICES ON THE 
                    B-ISDN (AUSTRALIA)
AVC-35 (MPEG91/076) ARCHITECTURE OF VIDEO SERVICE INTEGRATION ON THE B-ISDN
                    (AUSTRALIA)
AVC-51 (MPEG91/075) REQUIREMENTS OF THE HIGH QUALITY VIDEO CODING STANDARD
                    H.26X - CONSIDERATION OF MULTIPOINT SYSTEMS, DISTRIBUTION
                    SERVICES AND FUTURE ENHANCEMENT (JAPAN)
AVC-56 (MPEG91/064) CONSTRAINTS ON VARIABLE BIT-RATE VIDEO FOR ATM NETWORKS 
                    (AT&T BELL LABS)
AVC-58 (MPEG91/077) SIMULATION RESULTS FROM A SUBBAND SPLITTING CODING SCHEME
                    COMPATIBLE WITH MPEG1/H261 (CNET)


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