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RTP Payload Format for BT.656 Video Encoding (RFC2431)

IP.com Disclosure Number: IPCOM000003009D
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 8 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Tynan: AUTHOR

Abstract

This document specifies the RTP payload format for encapsulating ITU Recommendation BT.656-3 video streams in the Real-Time Transport Protocol (RTP). Each RTP packet contains all or a portion of one scan line as defined by ITU Recommendation BT.601-5, and includes fragmentation, decoding and positioning information.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group D. Tynan

Request for Comments: 2431 Claddagh Films

Category: Standards Track October 1998

RTP Payload Format for BT.656 Video Encoding

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 Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

Abstract

This document specifies the RTP payload format for encapsulating ITU

Recommendation BT.656-3 video streams in the Real-Time Transport

Protocol (RTP). Each RTP packet contains all or a portion of one

scan line as defined by ITU Recommendation BT.601-5, and includes

fragmentation, decoding and positioning information.

1. Introduction

This document describes a scheme to packetize uncompressed, studio-

quality video streams as defined by BT.656 for transport using RTP

[1]. A BT.656 video stream is defined by ITU-R Recommendation

BT.656-3 [2], as a means of interconnecting digital television

equipment operating on the 525-line or 625-line standards, and

complying with the 4:2:2 encoding parameters as defined in ITU-R

Recommendation BT.601-5 (formerly CCIR-601) [3], Part A.

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. The complete specification of RTP for a particular

application requires the RTP protocol document [1], a profile

specification document [4], and a payload format specification. This

document is intended to serve as the payload format specification for

studio-quality video streams.

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 [5].

2. Definitions

For the purposes of this document, the following definitions apply:

Y: An 8-bit or 10-bit coded "luminance" sample. Luminance in this

context refers to the BT.601-5 [3] definition which is not the same

as a true CIE luminance value. The value of "luminance" refers

specifically to video luma. However, in order to avoid confusion with

the BT.656 and BT.601 standards, the video luma value is referenced

in this document as luminance. Each value has 220 quantization

levels with the black level corresponding to level 16 and the peak

white level corresponding to 235.

Cb, Cr: An 8-bit or 10-bit coded color-difference sample (as per

BT.601-5). Each color-difference value has 225 quantization levels

in the ce...