RFC 2354 (rfc2354) - Page 1 of 12

Options for Repair of Streaming Media

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Network Working Group                                         C. Perkins
Request for Comments: 2354                                     O. Hodson
Category: Informational                        University College London
                                                               June 1998


                 Options for Repair of Streaming Media

Status of this Memo

   This memo provides information for the Internet community.  This memo
   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 summarizes a range of possible techniques for the
   repair of continuous media streams subject to packet loss.  The
   techniques discussed include redundant transmission, retransmission,
   interleaving and forward error correction.  The range of
   applicability of these techniques is noted, together with the
   protocol requirements and dependencies.

1  Introduction

   A number of applications have emerged which use RTP/UDP transport to
   deliver continuous media streams.  Due to the unreliable nature of
   UDP packet delivery, the quality of the received stream will be
   adversely affected by packet loss.  A number of techniques exist by
   which the effects of packet loss may be repaired.  These techniques
   have a wide range of applicability and require varying degrees of
   protocol support.  In this document, a number of such techniques are
   discussed, and recommendations for their applicability made.

   It should be noted that this document is introductory in nature, and
   does not attempt to be comprehensive.  In particular, we restrict our
   discussion to repair techniques which require the involvement of the
   sender of a media stream, and do not discuss possibilities for
   receiver based repair.

   For a more detailed survey, the reader is referred to [5].






Perkins & Hodson             Informational
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