Re: [rtcweb] [avtext] Fwd: New Version Notification for draft-fineberg-avtext-temporal-layer-ext-00.txt

"Mo Zanaty (mzanaty)" <> Wed, 31 July 2013 15:12 UTC

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From: "Mo Zanaty (mzanaty)" <>
To: Adam Fineberg <>
Thread-Topic: [avtext] [rtcweb] Fwd: New Version Notification for draft-fineberg-avtext-temporal-layer-ext-00.txt
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Date: Wed, 31 Jul 2013 15:12:01 +0000
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Subject: Re: [rtcweb] [avtext] Fwd: New Version Notification for draft-fineberg-avtext-temporal-layer-ext-00.txt
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Hi Adam,

Why do you include PictureID? I can understand how the "Y" bit for base layer sync can be useful to include. But how does including PictureID help identify temporal layers?


Date: Wed, 17 Jul 2013 17:09:46 -0700
Subject: [rtcweb] Fwd: New Version Notification for draft-fineberg-avtext-temporal-layer-ext-00.txt


I'm working on WebRTC services and have found that while developing services that forward VP8 video streams if we want to take advantage of the VP8 temporal scaling we must get the temporal layer information from the RTP header which requires us to decrypt the SRTP packets. This is undesirable both because the middle-box needs to have access to the keys as well as the because of the added overhead of the decrypt/encrypt cycle. This draft proposes an RTP header extension that will allow us to use the VP8 temporal layer information included in the header extension and therefore do forwarding without SRTP decryption. Comments welcome.

Adam Fineberg
fineberg at

-------- Original Message -------- 
New Version Notification for draft-fineberg-avtext-temporal-layer-ext-00.txt
Tue, 09 Jul 2013 10:02:05 -0700
internet-drafts at
Adam Fineberg <fineberg at>

A new version of I-D, draft-fineberg-avtext-temporal-layer-ext-00.txt
has been successfully submitted by Adam Fineberg and posted to the
IETF repository.

Filename:	 draft-fineberg-avtext-temporal-layer-ext
Revision:	 00
Title:		 A Real-Time Transport Protocol (RTP) Header Extension for VP8 Temporal Layer Information
Creation date:	 2013-07-08
Group:		 Individual Submission
Number of pages: 6

   This document defines a mechanism by which packets of Real-Time
   Tranport Protocol (RTP) video streams encoded with the VP8 codec can
   indicate, in an RTP header extension, the temporal layer information
   about the frame encoded in the RTP packet.  This information can be
   used in a middlebox performing bandwidth management of streams
   without requiring it to decrypt the streams.