RTP Payload Format for JPEG-compressed Video (RFC2435)
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
L. Berc: AUTHOR [+5]
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.
Network Working Group L. Berc
Request for Comments: 2435 Digital Equipment Corporation
Obsoletes: 2035 W. Fenner
Category: Standards Track Xerox PARC
Lawrence Berkeley Laboratory
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 (C) The Internet Society (1998). All Rights Reserved.
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-
email@example.com 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.
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 .
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
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