Re: [xrblock] ops-dir review of draft-ietf-xrblock-rtcp-xr-loss-conceal-10
Kevin Gross <kevin.gross@avanw.com> Wed, 26 March 2014 13:25 UTC
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Date: Wed, 26 Mar 2014 07:23:33 -0600
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From: Kevin Gross <kevin.gross@avanw.com>
To: Qin Wu <bill.wu@huawei.com>
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Subject: Re: [xrblock] ops-dir review of draft-ietf-xrblock-rtcp-xr-loss-conceal-10
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Seems like 0:8 as it appears to be used here can support a range *0.0* to 25.5%. 5% would be exactly represented as 50 or 0x32. Kevin Gross - AVA Networks On Tue, Mar 25, 2014 at 8:44 PM, Qin Wu <bill.wu@huawei.com> wrote: > Hi, > In the OPS-DIR review, our reviewer asked to provide the hex value of the > default threshold setting and one rounding issue was brought up. > The related paragraph in the draft is: > " > > > SCS Threshold: 8 bits > > > > > > The SCS Threshold is defined as the percentage of packets > > > corresponding to lost or discarded frames that must occur within > a > > > one second period in order for the second to be classified as a > > > Severely Concealed Second. This is expressed in numeric format > > > 0:8 and hence can represent a range of 0.1 to 25.5 percent loss > or > > > discard. > > > > > > A default threshold of 5% effective frame loss (50ms effective > > > frame loss ) per second is suggested. > " > The SCS threshold is represented in percentage. When we use numeric format > 0:8 > to represent the default value of SCS threshold, we only can represent > 0.05078125 > rather than 0.05 or 5% (which is set as the default value of threshold in > the draft). > > If we change the default threshold value into 0.05078125 and the hex value > of 0.05078125 is 0x0D, > This rounding issue can be resolved. > > Alternatively, we can change unit of SCS threshold back into millisecond, > we can precisely represent 5% > frame loss per second or the default threshold value 0.05. The range of > 0.1 to 25.5 percentage can be > represented into the range from 1ms effective frame loss to 255ms > effective frame loss. > > Regards! > -Qin > > _______________________________________________ > xrblock mailing list > xrblock@ietf.org > https://www.ietf.org/mailman/listinfo/xrblock >