RTP Payload Format for BT.656 Video Encoding (RFC2431)
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
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.
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 (C) The Internet Society (1998). All Rights Reserved.
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 document describes a scheme to packetize uncompressed, studio-
quality video streams as defined by BT.656 for transport using RTP
. A BT.656 video stream is defined by ITU-R Recommendation
BT.656-3 , 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) , 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 , a profile
specification document , 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 .
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  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...