RTP Payload Format for VC-2 High Quality (HQ) Profile
RFC 8450

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06
• 07
• 08

Internet Engineering Task Force (IETF)                         J. Weaver
Request for Comments: 8450                                           BBC
Category: Standards Track                                   October 2018
ISSN: 2070-1721

         RTP Payload Format for VC-2 High Quality (HQ) Profile

Abstract

   This memo describes an RTP payload format for the High Quality (HQ)
   profile of Society of Motion Picture and Television Engineers
   Standard ST 2042-1, known as VC-2.  This document describes the
   transport of HQ Profile VC-2 in RTP packets and has applications for
   low-complexity, high-bandwidth streaming of both lossless and lossy
   compressed video.

   The HQ profile of VC-2 is intended for low-latency video compression
   (with latency potentially on the order of lines of video) at high
   data rates (with compression ratios on the order of 2:1 or 4:1).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8450.

Weaver                       Standards Track                    [Page 1]
RFC 8450                   VC-2 HQ RTP Payload              October 2018

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions, Definitions, and Acronyms  . . . . . . . . . . .   3
   3.  Media Format Description  . . . . . . . . . . . . . . . . . .   3
   4.  Payload Format  . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  RTP Header Usage  . . . . . . . . . . . . . . . . . . . .  10
     4.2.  Payload Header  . . . . . . . . . . . . . . . . . . . . .  11
     4.3.  The Choice of Parse Codes (Informative) . . . . . . . . .  13
     4.4.  Stream Constraints  . . . . . . . . . . . . . . . . . . .  14
     4.5.  Payload Data  . . . . . . . . . . . . . . . . . . . . . .  15
       4.5.1.  Reassembling the Data . . . . . . . . . . . . . . . .  16
   5.  Forward Error Correction (FEC) Considerations . . . . . . . .  18
   6.  Congestion Control Considerations . . . . . . . . . . . . . .  18
   7.  Payload Format Parameters . . . . . . . . . . . . . . . . . .  19
     7.1.  Media Type Definition . . . . . . . . . . . . . . . . . .  19
     7.2.  Mapping to the Session Description Protocol (SDP) . . . .  21
     7.3.  Offer/Answer Considerations . . . . . . . . . . . . . . .  21
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  22
     10.2.  Informative References . . . . . . . . . . . . . . . . .  23
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  24

Weaver                       Standards Track                    [Page 2]
RFC 8450                   VC-2 HQ RTP Payload              October 2018

1.  Introduction

   This memo specifies an RTP payload format for the video coding
   standard Society of Motion Picture and Television Engineers ST
   2042-1:2017 [VC2], also known as VC-2

   The VC-2 codec is a wavelet-based codec intended primarily for
   professional video use with high bit-rates and only low levels of
   compression.  It has been designed to have a low level of complexity
   and potentially a very low latency through both encoder and decoder:
   with some choices of parameters, this latency may be as low as a few
   lines of video.

   The low level of complexity in the VC-2 codec allows for this low-
   latency operation but also means that it lacks many of the more
   powerful compression techniques used in other codecs.  As such, it is
   suitable for low compression ratios that produce coded data rates
   around half to a quarter of that of uncompressed video, at a similar