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RTP Payload Format for JPEG-compressed Video (RFC2035)

IP.com Disclosure Number: IPCOM000002589D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 13 page(s) / 28K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

L. Berc: AUTHOR [+4]

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 11% of the total text.

Network Working Group L. Berc

Request for Comments: 2035 Digital Equipment Corporation

Category: Standards Track W. Fenner

Xerox PARC

R. Frederick

Xerox PARC

S. McCanne

Lawrence Berkeley Laboratory

October 1996

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.

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).

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

scan, there are one to four components,which represent the three

components of a color signal (e.g., "red, green, and blue", or a

luminance signal and two chromanince signals). These components can

be encoded as separate scans or interleaved into a single scan.

Each frame and scan is preceded with a header containing optional

definitions for compression parameters like quantization tables and

Huffman coding tables. The headers and optional parameters are

identified with "markers" and comprise a marker segment; each scan

appears as an entropy-coded bit...