RFC 2190 (rfc2190) - Page 1 of 12

RTP Payload Format for H

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Network Working Group                                             C. Zhu
Request for Comments: 2190                                   Intel Corp.
Category: Standards Track                                 September 1997


               RTP Payload Format for H.263 Video Streams

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 document specifies the payload format for encapsulating an H.263
   bitstream in the Real-Time Transport Protocol (RTP). Three modes are
   defined for the H.263 payload header. An RTP packet can use one of
   the three modes for H.263 video streams depending on the desired
   network packet size and H.263 encoding options employed. The shortest
   H.263 payload header (mode A) supports fragmentation at Group of
   Block (GOB) boundaries. The long H.263 payload headers (mode B and C)
   support fragmentation at Macroblock (MB) boundaries.

1. Introduction

   This document describes a scheme to packetize an H.263 video stream
   for transport using RTP [1]. H.263 video stream is defined by ITU-T
   Recommendation H.263 (referred to as H.263 in this document) [4] for
   video coding at very low data rates. RTP is defined by the Internet
   Engineering Task Force (IETF) to provide end-to-end network transport
   functions suitable for applications transmitting real-time data over
   multicast or unicast network services.

2. Definitions

   The following definitions apply in this document:

   CIF: Common Intermediate Format. For H.263, a CIF picture has 352 x
   288 pixels for luminance, and 176 x 144 pixels for chrominance.

   QCIF: Quarter CIF source format with 176 x 144 pixels for luminance
   and 88 x 72 pixels for chrominance.

   Sub-QCIF:  picture source format with 128 x 96 pixels for luminance
   and 64 x 48 pixels for chrominance.



Zhu                         Standards Track
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