Re: [xrblock] WGLC for draft-ietf-xrblock-rtcp-xr-discardand xrblock-rtcp-xr-discard-rle-metrics

----- Original Message ----- 
From: "Roni Even" <ron.even.tlv@gmail.com>
To: "'Shida Schubert'" <shida@ntt-at.com>; "'xrblock'" <xrblock@ietf.org>
Cc: <draft-ietf-xrblock-rtcp-xr-discard@ietf.org>; <draft-ietf-xrblock-rtcp-xr-discard-rle-metrics@ietf.org>
Sent: Saturday, June 16, 2012 4:12 AM
Subject: Re: [xrblock] WGLC for draft-ietf-xrblock-rtcp-xr-discardand xrblock-rtcp-xr-discard-rle-metrics

> Hi,
> I read draft-ietf-xrblock-rtcp-xr-discard. In general it is ready.
> 
> One nit is in figure 1 it says BT=NBGD while elsewhere it says BT=ND

[Qin]: Good catch and will fix this in the update.

> As for the number of packet discarded I was wondering if the relevant
> information is the number of packet or in the case of video for example
> where a couple of packet constitute one frame and have the same time stamp
> they should count as one packet (or one video frame)

[Qin]: It is former since it rely on time window and is still calculated based on sequence number of RTP packet.
Also it is used with "Packets Expected " to calculate "Gap Discard Rate" in draft-zorn-xrblock-rtcp-xr-al-stat.
As described in draft-zorn-xrblock-rtcp-xr-al-stat, 

"Packets Expected is calculated as the
 difference between "extended last sequence number" and "extended
 first sequence number" (Interval or Cumulative) provided in the
 Measurement Information block [MEASIDENT].
"

Regarding a couple of packet constituting a frame, I think you refer to 
"the number of frame discarded", this metric is actually not specified in the Discard draft but in 
"Frame Impairment Statistics Summary Block " defined in draft-zorn-xrblock-rtcp-xr-al-stat.
That is to say, Frame Impairment Statistics Summary Block can be used to report "the 
number of frame discarded".

> Roni
> 
>> -----Original Message-----
>> From: xrblock-bounces@ietf.org [mailto:xrblock-bounces@ietf.org] On
>> Behalf Of Shida Schubert
>> Sent: Monday, June 11, 2012 9:27 AM
>> To: xrblock
>> Cc: draft-ietf-xrblock-rtcp-xr-discard-rle-metrics@ietf.org; draft-
>> ietf-xrblock-rtcp-xr-discard@ietf.org
>> Subject: [xrblock] WGLC for draft-ietf-xrblock-rtcp-xr-discard and
>> xrblock-rtcp-xr-discard-rle-metrics
>> 
>> All;
>> 
>>  We have had very little feedback (actually none) on WGLC for xrblock-
>> rtcp-xr-discard-rle-metrics, which is ending on the 14th.
>> 
>>  As xrblock-rtcp-xr-discard-rle-metrics references draft-ietf-xrblock-
>> rtcp-xr-discard, we will try to run WGLC for these two drafts in
>> parallel to hope for more feedbacks.
>> 
>>  We will carry this WGLC until June 28th.
>> 
>>  If you are interested in one of the draft, please try to read through
>> both drafts and provide some comments on the list. If there are no
>> issues, please indicate that on the list as well to show that you have
>> read and happy with the document(s).
>> 
>>  Many Thanks & Regards
>>   Shida Schubert as co-chair
>> 
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> 
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