RFC 2190 (rfc2190) - Page 1 of 12
RTP Payload Format for H
Alternative Format: Original Text Document
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