ISO/IEC JTC 1/SC 29 N 3290 DATE: 1999-10-21 REPLACES: --

DOC. TYPE	Outgoing Liaison Statement
TITLE	Liaison Statement from SC 29/WG 11 to IETF on MPEG-4 on the Internet [SC 29/WG 11 N 2987, Attachment: WG 11 N 3021]
SOURCE	ISO/IEC JTC 1/SC 29/WG 11
PROJECT NO.	--
STATUS	In accordance with Resolution 2.8.3 taken at the forty-ninth WG 11 meeting, 1999-10-04/08, Melbourne, Australia, the SC 29 Secretariat has forwarded this liaison statement to the liaison organization with WG 11 N 3021, Study on Internet draft for the carriage of MPEG-4 on IP.
REFERENCES	SC 29 N 3265 [WG 11 N 2903]: Resolutions, 49th SC 29/WG 11 Meeting
ACTION ID.	FYI
REQUESTED ACT.	For SC 29's information
DUE DATE	--
NO. of PAGES FILE SIZE (KB) DISKETT NO. ISSUE NO. FILE NAMES ACCESS LEVEL LANGUAGE USED	6(doc) 52.9 (except isoiec.gif) 29D367 29F272 isoiec.gif, 29n3290c.htm, 29n32901.doc Def English
DISTRIBUTION	SC 29 P, O and L-members; SC 29 Officers; JTC 1 Secretariat; ISO/IEC ITTF

Narumi Hirose, Secretariat, ISO/IEC JTC 1/SC 29
IPSJ/ITSCJ*, Room 308-3, Kikai-Shinko-Kaikan Bldg., 3-5-8, Shiba-Koen, Minato-Ku Tokyo 105-0011 Japan
Telephone: +81-3-3431-2808; Facsimile: +81-3-3431-6493; E-mail: hirose@itscj.ipsj.or.jp
* Information Processing Society of Japan/Information Technology Standards Commission of Japan (A standards organization accredited by JISC)

Title:	Liaison to IETF
Source:	Convenor of MPEG

Thank you for your continuing interest in making MPEG-4 technology available on the Internet. We had several discussions of technical topics, which culminated in a joint conference call with interested parties from your group.

Several issues were clarified. In particular, MPEG recommends that the simple RTP MPEG-4 payload format be used initially. If this approach is found to have deficiencies in certain scenarios and under certain conditions, then improvements may be considered.

In order to facilitate possible future improvements, MPEG approved the inclusion of the degradation priority field in all SL packets, not just at the start of access units. However, its use remains non-normative for the present.

We started to consider an extension of the RTP payload format specification for MPEG-4 so that MPEG-4 Audio/Visual streams may as well be directly mapped into RTP packets. Such RTP payload formats would be used in applications that only require the use of individual audiovisual coding tools as defined in ISO/IEC 14496-2 and -3. Examples include Internet (TV) phone and mobile multimedia terminals. We believe that these are important applications of MPEG-4. A draft specification for this RTP payload format is attached (N 3021). We would like to continue the discussion jointly with your group.

We look forward to further collaboration and cooperation on these matters.

Attachment

WG 11 N 3021: Study on Internet draft for the carriage of MPEG-4 on IP

• File name: 29n32901.doc
  
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