RFC 2035 (rfc2035) - Page 1 of 16

RTP Payload Format for JPEG-compressed Video

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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-
    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



Berc, et. al.               Standards Track
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