RTP Control Protocol (RTCP) Extended Report (XR) Block for Loss Concealment Metrics for Video Applications
RFC 7867

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Internet Engineering Task Force (IETF)                          R. Huang
Request for Comments: 7867                                        Huawei
Category: Standards Track                                      July 2016
ISSN: 2070-1721

         RTP Control Protocol (RTCP) Extended Report (XR) Block
          for Loss Concealment Metrics for Video Applications

Abstract

   This document defines a new RTP Control Protocol (RTCP) Extended
   Report (XR) block that allows the reporting of loss concealment
   metrics for video applications of RTP.

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
   http://www.rfc-editor.org/info/rfc7867.

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.

Huang                        Standards Track                    [Page 1]
RFC 7867              Video LC Metrics for RTCP XR             July 2016

Table of Contents

   1. Introduction ....................................................2
      1.1. RTCP and RTCP XR Reports ...................................3
      1.2. Performance Metrics Framework ..............................3
      1.3. Applicability ..............................................3
   2. Terminology .....................................................3
   3. Video Loss Concealment Methods ..................................3
   4. Video Loss Concealment Report Block .............................4
   5. SDP Signaling ...................................................8
      5.1. SDP rtcp-xr-attrib Attribute Extension .....................8
      5.2. Offer/Answer Usage .........................................9
   6. Security Considerations .........................................9
   7. IANA Considerations .............................................9
      7.1. New RTCP XR Block Type Value ...............................9
      7.2. New RTCP XR SDP Parameter ..................................9
      7.3. Contact Information for Registrations .....................10
   8. References .....................................................10
      8.1. Normative References ......................................10
      8.2. Informative References ....................................11
   Appendix A. Metrics Represented Using the Template from RFC 6390 ..12
   Acknowledgements ..................................................16
   Authors' Addresses ................................................16

1.  Introduction

   Multimedia applications often suffer from packet losses in IP
   networks.  In order to get a reasonable degree of quality when there
   is packet loss, it is necessary to have loss concealment mechanisms
   at the decoder.  Video loss concealment is a range of techniques to
   mask the effects of packet loss in video communications.

   In some applications, reporting the information of receivers applying
   video loss concealment could give monitors or senders useful
   information on the Quality of Experience (QoE) of the application.
   One example is no-reference video quality evaluation.  Video probes
   located upstream from the video endpoint or terminal may not see loss
   occurring between the probe and the endpoint, and also may not be
   fully aware of the specific loss concealment methods being
   dynamically applied by the video endpoint.  Evaluating error
   concealment is important in this circumstance to estimate the
   subjective impact of impairments.

   This document defines one new block type for video loss concealment
   to augment those defined in [RFC3611] and [RFC7294] for use in a
   range of RTP video applications.  The metrics defined in this
   document belong to the class of transport-related terminal metrics
   defined in [RFC6792].

Huang                        Standards Track                    [Page 2]
RFC 7867              Video LC Metrics for RTCP XR             July 2016