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The Layer Refresh Request (LRR) RTCP Feedback Message

Approval announcement
Draft of message to be sent after approval:


From: The IESG <>
To: IETF-Announce <>
Cc:,,,, The IESG <>,, Rachel Huang <>,
Subject: Protocol Action: 'The Layer Refresh Request (LRR) RTCP Feedback Message' to Proposed Standard (draft-ietf-avtext-lrr-07.txt)

The IESG has approved the following document:
- 'The Layer Refresh Request (LRR) RTCP Feedback Message'
  (draft-ietf-avtext-lrr-07.txt) as Proposed Standard

This document is the product of the Audio/Video Transport Extensions Working

The IESG contact persons are Adam Roach, Alexey Melnikov and Ben Campbell.

A URL of this Internet Draft is:

Ballot Text

Technical Summary:

This document specifies a new RTCP payload-specific feedback mssage to allow a receiver of a layered media stream to request one or more of its substreams to be refereshed without requiring the entire stream to be refreshed. This new message can be used for both temporally and spatially scaled streams. This document also defines its use with several RTP payloads for scalable media formats.

Working Group Summary:

The WG is happy with current version. No technical comments are received. 

Document Quality:

The document got some reviews from AVT experts, and enough discussions during the meetings. There exist widely deployed implementations of the FIR message specified in RFC5104. This draft introduces a new request for layered codecs either spatially or temporally to avoid unnecessary information obtained by FIR. This is expected to be a very useful implementation when used with scaled streams, for example, streams with H.264 SVC. 


Document Shepherd: Rachel Huang
Responsible AD: Ben Campell

RFC Editor Note