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RTP Payload Format for JPEG-compressed Video (RFC2435)

IP.com Disclosure Number: IPCOM000003013D
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 21 page(s) / 50K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

L. Berc: AUTHOR [+5]

Abstract

This memo describes the RTP payload format for JPEG video streams. The packet format is optimized for real-time video streams where codec parameters change rarely from frame to frame.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group L. Berc

Request for Comments: 2435 Digital Equipment Corporation

Obsoletes: 2035 W. Fenner

Category: Standards Track Xerox PARC

R. Frederick

Xerox PARC

S. McCanne

Lawrence Berkeley Laboratory

P. Stewart

Xerox PARC

October 1998

RTP Payload Format for JPEG-compressed Video

Status of this Memo

This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for

improvements. Please refer to the current edition of the "Internet

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

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

Abstract

This memo describes the RTP payload format for JPEG video streams.

The packet format is optimized for real-time video streams where

codec parameters change rarely from frame to frame.

This document is a product of the Audio-Video Transport working group

within the Internet Engineering Task Force. Comments are solicited

and should be addressed to the working group's mailing list at rem-

conf@es.net and/or the author(s).

Changes from RFC 2035

Most of this memo is identical to RFC 2035. The changes made to the

protocol are summarized in Appendix D.

Key Words

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

document are to be interpreted as described in RFC 2119 [9].

1. Introduction

The Joint Photographic Experts Group (JPEG) standard [1,2,3] defines

a family of compression algorithms for continuous-tone, still images.

This still image compression standard can be applied to video by

compressing each frame of video as an independent still image and

transmitting them in series. Video coded in this fashion is often

called Motion-JPEG.

We first give an overview of JPEG and then describe the specific

subset of JPEG that is supported in RTP and the mechanism by which

JPEG frames are carried as RTP payloads.

The JPEG standard defines four modes of operation: the sequential DCT

mode, the progressive DCT mode, the lossless mode, and the

hierarchical mode. Depending on the mode, the image is represented

in one or more passes. Each pass (called a frame in the JPEG

standard) is further broken down into one or more scans. Within each

sc...