Re: [xrblock] FW: New Version Notification for draft-huang-xrblock-rtcp-xr-video-lc-00.txt

Alan Clark <> Thu, 03 July 2014 10:32 UTC

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Date: Thu, 03 Jul 2014 06:32:00 -0400
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Subject: Re: [xrblock] FW: New Version Notification for draft-huang-xrblock-rtcp-xr-video-lc-00.txt
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Hi Rachel

A few quick comments:

(i) I would avoid the use of the term "lossless" to mean video with no 
packet losses - "lossless" is usually used to mean that the video 
encoding and decoding process introduces no distortion or error. You 
could use "Loss Free Seconds" or be consistent with the other loss 
concealment draft and use the terms concealed/ unconcealed.

(ii) I would suggest changing

"Interactive repairs need the communication between receiver and sender. 
The receiving side using interactive repairs usually provides feedback 
message to the sending side for specific help. Retransmission is an 
effective interactive packet loss recovery technique for real-time 
applications with relaxed delay bounds. The sender resends packets when 
the sender notices the packets have been either damaged or lost. 
Protocols which provide such technique use a combination of 
acknowledgments, retransmission of missing and/or damaged packets. For 
example, RTP retransmission [4588]. Besides retransmission, there are 
two major feedback messages for asking for sender side repair FIR 
(RFC5104) or PLI (RFC4585)."


"Error concealment may involve feedback from the receiver to the sender. 
Retransmission may be used on connections with low delay or in 
delay-insensitive applications; the receiver detects missing packets or 
missing content and sends retransmission requests to the sender, 
typically using RTCP messages (RFC 4585, RFC 4588, RFC 5105 ). Other 
forms of feedback include control of the rate of forward error 
correction (FEC) codes and encoder parameters."

(iii) I would tend to use the term Retransmission rather than 
Interactive Repair for Video Loss Concealment Method as other forms of 
interactive repair would overlap with other terms (e.g. dynamic control 
of FEC rate would be an Error Resilient method).

(iv) Some of the language in the draft was reused word-for-word from 
other documents (e.g. Section 3 incorporates wording from my email to 
the XRBLOCK on 10/10/12) - you should attribute this appropriately.



On 7/3/14, 5:19 AM, Huangyihong (Rachel) wrote:
> Dear all,
> I have just submitted a new draft about extending RTCP XR to include video loss concealment metrics. Your review and comments are highly appreciated.
> BR,
> Rachel
> -----Original Message-----
> From: []
> Sent: Thursday, July 03, 2014 5:17 PM
> To: Huangyihong (Rachel); Huangyihong (Rachel)
> Subject: New Version Notification for draft-huang-xrblock-rtcp-xr-video-lc-00.txt
> A new version of I-D, draft-huang-xrblock-rtcp-xr-video-lc-00.txt
> has been successfully submitted by Rachel Huang and posted to the IETF repository.
> Name:		draft-huang-xrblock-rtcp-xr-video-lc
> Revision:	00
> Title:		RTCP XR Report Block for Loss Concealment Metrics Reporting on Video Applications
> Document date:	2014-07-03
> Group:		Individual Submission
> Pages:		10
> URL:  
> Status:
> Htmlized:
> Abstract:
>     This draft defines a new video loss concealment block type to augment
>     those defined in [RFC3611] and [i.d-ietf-xrblock-rtcp-xr-loss-
>     concealment] for use in a range of RTP video applications.
> Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at
> The IETF Secretariat
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