RFC 2448 (rfc2448) - Page 1 of 7

AT&T's Error Resilient Video Transmission Technique

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Network Working Group                                        M. Civanlar
Request for Comments: 2448                                       G. Cash
Category: Informational                                       B. Haskell
                                                      AT&T Labs-Research
                                                           November 1998


          AT&T's Error Resilient Video Transmission Technique

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

Abstract

   This document describes a set of techniques for packet loss resilient
   transmission of compressed video bitstreams based on reliable
   delivery of their vital information-carrying segments. The described
   techniques can be used over packet networks without packet
   prioritization. These techniques are related to AT&T/Lucent patents
   [1, 2].

1. Introduction

   It is well known that every bit in a compressed video bitstream is
   not equal. Some bits belong to segments defining vital information
   such as picture types, quantization values, parameter ranges, average
   intensity values for image blocks, etc. When transporting compressed
   video bitstreams over packet networks, packet losses from such
   segments cause a much longer lasting and severe degradation on the
   output of a decoder than that caused by packet losses from other
   segments. We will call the vital information-carrying segments "High
   Priority (HP)" segments. The rest of the bitstream consists of "Low
   Priority (LP)" segments. Clearly, the video outputs resulting from
   transport techniques that protect the HP segments against packet
   losses are more resilient to packet losses in general.

   Protection of the HP segments can be accomplished in many ways. These
   include:

      - redundant transmission of the HP segments as described
        in [3] for MPEG RTP payloads



Civanlar, et. al.            Informational
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