WebRTC Video Processing and Codec Requirements
RFC 7742

Document Type RFC - Proposed Standard (March 2016; No errata)
Last updated 2016-03-24
Replaces draft-cbran-rtcweb-codec
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Sean Turner
Shepherd write-up Show (last changed 2015-04-16)
IESG IESG state RFC 7742 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Alissa Cooper
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                        A.B. Roach
Request for Comments: 7742                                       Mozilla
Category: Standards Track                                     March 2016
ISSN: 2070-1721

             WebRTC Video Processing and Codec Requirements

Abstract

   This specification provides the requirements and considerations for
   WebRTC applications to send and receive video across a network.  It
   specifies the video processing that is required as well as video
   codecs and their parameters.

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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7742.

Copyright Notice

   Copyright (c) 2016 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
   (http://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.

Roach                        Standards Track                    [Page 1]
RFC 7742                      WebRTC Video                    March 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Pre- and Post-Processing  . . . . . . . . . . . . . . . . . .   3
     3.1.  Camera-Source Video . . . . . . . . . . . . . . . . . . .   3
     3.2.  Screen-Source Video . . . . . . . . . . . . . . . . . . .   4
   4.  Stream Orientation  . . . . . . . . . . . . . . . . . . . . .   4
   5.  Mandatory-to-Implement Video Codec  . . . . . . . . . . . . .   5
   6.  Codec-Specific Considerations . . . . . . . . . . . . . . . .   6
     6.1.  VP8 . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.2.  H.264 . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   One of the major functions of WebRTC endpoints is the ability to send
   and receive interactive video.  The video might come from a camera, a
   screen recording, a stored file, or some other source.  This
   specification provides the requirements and considerations for WebRTC
   applications to send and receive video across a network.  It
   specifies the video processing that is required as well as video
   codecs and their parameters.

   Note that this document only discusses those issues dealing with
   video-codec handling.  Issues that are related to transport of media
   streams across the network are specified in [WebRTC-RTP-USAGE].

2.  Terminology

   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 [RFC2119].

   The following definitions are used in this document:

   o  A WebRTC browser (also called a WebRTC User Agent or WebRTC UA) is
      something that conforms to both the protocol specification and the
      Javascript API (see [RTCWEB-OVERVIEW]).

Roach                        Standards Track                    [Page 2]
RFC 7742                      WebRTC Video                    March 2016

   o  A WebRTC non-browser is something that conforms to the protocol
      specification, but it does not claim to implement the Javascript
      API.  This can also be called a "WebRTC device" or "WebRTC native
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