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RTP Payload Format for Bundled MPEG (RFC2343)

IP.com Disclosure Number: IPCOM000002912D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 6 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Civanlar: AUTHOR [+3]

Abstract

This document describes a payload type for bundled, MPEG-2 encoded video and audio data that may be used with RTP, version 2. Bundling has some advantages for this payload type particularly when it is used for video-on-demand applications. This payload type may be used when its advantages are important enough to sacrifice the modularity of having separate audio and video streams.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 19% of the total text.

Network Working Group M. Civanlar

Request for Comments: 2343 G. Cash

Category: Experimental B. Haskell

AT&T Labs-Research

May 1998

RTP Payload Format for Bundled MPEG

Status of this Memo

This memo defines an Experimental Protocol for the Internet

community. This memo does not specify an Internet standard of any

kind. Discussion and suggestions for improvement are requested.

Distribution of this memo is unlimited.

Copyright Notice

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

Abstract

This document describes a payload type for bundled, MPEG-2 encoded

video and audio data that may be used with RTP, version 2. Bundling

has some advantages for this payload type particularly when it is

used for video-on-demand applications. This payload type may be used

when its advantages are important enough to sacrifice the modularity

of having separate audio and video streams.

1. Introduction

This document describes a bundled packetization scheme for MPEG-2

encoded audio and video streams using the Real-time Transport

Protocol (RTP), version 2 [1].

The MPEG-2 International standard consists of three layers: audio,

video and systems [2]. The audio and the video layers define the

syntax and semantics of the corresponding "elementary streams." The

systems layer supports synchronization and interleaving of multiple

compressed streams, buffer initialization and management, and time

identification. RFC 2250 [3] describes packetization techniques to

transport individual audio and video elementary streams as well as

the transport stream, which is defined at the system layer, using the

RTP.

The bundled packetization scheme is needed because it has several

advantages over other schemes for some important applications

including video-on-demand (VOD) where, audio and video are always

used together. Its advantages over independent packetization of

audio and video are:

1. Uses a single port per "program" (i.e. bundled A/V). This may

increase the number of streams that can be served e.g., from a VOD

server. Also, it eliminates the performance hit when two ports are

used for the separate audio and video streams on the client side.

2. Provides implicit synchronization of audio and video. This is

particularly convenient when the A/V data is stored in an

interleaved format at the server.

3. Reduces the header overhead. Since using large packets increases

the effects of losses and delay, audio only packets need to be

smaller increasing the overhead. An A/V bundled format can provide

about 1% overall overhead reduction. Considering the high bitrates

used for MPEG-2 encoded material, e.g. 4 Mbps, the number of ...