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Annex 6 to Doc. AVC-22R
Annex 6 to Doc. AVC-22R


SOURCE : CCITT SGXV Experts Group for ATM Video Coding
TITLE  : Letter to Dr. L. Chiariglione, Convenor ISO/IEC JTC1/SC2/WG11
PURPOSE: Liaison statementœ


In its liaison letter to ISO/IEC JTCI/SC2/WG11, CCITT SGXV Working Party XV/1 
has stated its recognition of the importance of close collaboration between 
the two groups as invited in the liaison letter of July 1990 from the WG11 
convenor.

At its first meeting, 13 - 16 November 1990, the CCITT Experts Group for ATM 
Video Coding discussed this further, in particular the exact manner in which 
this collaboration could be best achieved.

The scope of work of the Experts Group will initially cover video coding at 
bit rates between 64 kbit/s and several tens of Mbit/s, for transmission over 
Asynchronous Transfer Mode networks.  This range encompasses that of the 
next phase of ISO/MPEG.  Furthermore as already envisaged by MPEG in its 
preliminary requirements documents, the transmission of MPEG-2 encoded 
signals over telecommunications networks, especially ATM based ones will be 
very important.  Consequently it would indeed be of great mutual benefit if 
commonality of standards or parts of standards could be achieved.

To this end the CCITT group proposes that joint meeting sessions be 
arranged in the areas of overlapping interest and responsibility, namely:

     - source video coding algorithm and video multiplexing,
     - system issues concerning multimedia multiplexing and synchronisation,
     - implementation considerations.

The aim would be to maximize the effort applied to common areas while 
recognizing that other aspects will remain the sole responsibility of the 
individual organisations, for example matters relating solely to storage 
media or telecommunications networks.

The exact nature of the joint meetings will require joint consultation and 
it is suggested that this be accomplished so that the first joint meeting 
would occur at the beginning of March 1991.  Both MPEG and CCITT have 
meetings scheduled at this time.

The CCITT work plan is attached and it shows a high degree of consistency 
with the MPEG work plan.  As an early input to the joint effort, a document 
is also appended listing some provisional recommended requirements for the 
proposed joint activity.


END

Attachments: Annex 5 (work plan) and Annex 9 (provisional requirements) of 
this meeting report