Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-jb-02.txt
Glen Zorn <glenzorn@gmail.com> Thu, 20 December 2012 10:21 UTC
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Date: Thu, 20 Dec 2012 17:20:55 +0700
From: Glen Zorn <glenzorn@gmail.com>
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To: Qin Wu <bill.wu@huawei.com>
References: <50CAF991.8050508@gmail.com> <A58F079A8D804929AA28B535FAB72BAC@china.huawei.com> <50CC10DF.4030403@gmail.com> <A7B4A1EEC74F4B5788CE4568D1EA280F@china.huawei.com> <50D2BD3C.10507@gmail.com> <2240AA3806904019953BBA7AC49177B6@china.huawei.com>
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Subject: Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-jb-02.txt
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On 12/20/2012 03:48 PM, Qin Wu wrote: >> On 12/17/2012 09:04 AM, Qin Wu wrote: >> ... >> >>>>>> *Section 3.2* The description of the "jitter buffer nominal delay" >>>>>> says that "It is calculated based on the time for packets spent in >>>>>> the jitter buffer." How is it calculated? >>>>> [Qin]:It will be calculate based on the difference between the time >>>>> when the packet enter into the jitter buffer and the time when the >>>>> packet come out from jitter buffer. It is mostly up to specific >>>>> implementation and doesn't need to spell out. >>>> So it's OK if two different implementations produce different numbers >>>> from the same data? That doesn't seem very interoperable, somehow. >>>> Maybe one problem I'm having with this is that the way the word >>>> "nominal" is used doesn't map to any definition of which I'm aware. >>> [Qin]: Suppose a lot of packets are receieved in one measurement interval. Some packets arrive very earlier, some packets arrive very late. >>> some packets arrive extractly on time. Nominal packet are referred to the packet that arrives exactly on time >>> Since they have the same reference measurement point, usually they will get the same result. >> Usually? > [Qin]: one update (-05) was done to clear this ambiguity based on recent comment > from Kevin who has the similar concern as you. The change is > replace "It is calculated based on the time for packets spent in the jitter buffer." > with "It is calculated based on the difference between the receipt time and the > playout time for the packet that arrives exactly on time." > > With this justification text, you will see different implementations will not produce different numbers. Doesn't that depend upon what the application defines "exactly on time" to mean? > >>> For the definition, you also can see the metric "jitter buffer nominal delay " defined in RFC3611,section4.7.7. >> Thanks for the reference, but it raises more questions than it answers >> for me. The draft appears to duplicate most, but not all, of the >> fields related to jitter buffers included in the VoIP Metrics Report >> Block defined in RFC 3611, but says nothing about its relationship to >> that RFC (i.e., if it obsoletes or updates RFC 3611). So as it stands >> it looks like if "jitter buffer absolute maximum delay" is to be >> reported the VoIP Metrics Report Block needs to be sent anyway. I'm >> assuming that this is intentional but I don't recall any discussion of >> it on the list. Was I just not paying attention? Is there a plan to >> obsolete RFC 3611 at some point in the future (say, when all the XR >> blocks defined therein have been sliced & diced into the currently >> fashionable tiny hunks)? It's not in the charter... > [Qin]: The metric has been defined in RFC3611. However the block format to carry > this metric need to be re-specified so that we can make such metric block can be > applicable to more other RTP applications rather than VOIP application since VOIP metric > report doesn't look reusable for video application. I don't think RFC3611 needs to be obseleted. So this block is for use with any real-time application _except_ VOIP?' > >>>> ... >>>> > >
- [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-jb-02… Romascanu, Dan (Dan)
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Claire Bi(jiayu)
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Colin Perkins
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Colin Perkins
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Glen Zorn
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Colin Perkins
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Varun Singh
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Romascanu, Dan (Dan)
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Romascanu, Dan (Dan)
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Glen Zorn
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Glen Zorn
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Claire Bi(jiayu)
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Glen Zorn
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Glen Zorn
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Glen Zorn
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Kevin Gross
- Re: [xrblock] WGLC - draft-ietf-xrblock-rtcp-xr-j… Qin Wu