Re: [rtcweb] Consensus vs. Voting (was Re: Call for Consensus Regarding Selecting Recommended Audio Codecs) (UNCLASSIFIED)
Andrew Allen <aallen@rim.com> Thu, 17 January 2013 12:54 UTC
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From: Andrew Allen <aallen@rim.com>
To: "radhika.r.roy.civ@mail.mil" <radhika.r.roy.civ@mail.mil>, "roman@telurix.com" <roman@telurix.com>, "martin.thomson@gmail.com" <martin.thomson@gmail.com>
Thread-Topic: [rtcweb] Consensus vs. Voting (was Re: Call for Consensus Regarding Selecting Recommended Audio Codecs) (UNCLASSIFIED)
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Date: Thu, 17 Jan 2013 12:54:03 +0000
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Subject: Re: [rtcweb] Consensus vs. Voting (was Re: Call for Consensus Regarding Selecting Recommended Audio Codecs) (UNCLASSIFIED)
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As I recall during the MTI discussion it was claimed that OPUS was intended for interoperability between RTCweb endoints and G.711 for interoperability with legacy. That's why we selected 2 MTI Codecs. Transcoding between G.711 and something else like G.722 will not have anything like the transcoding cost as between OPUS and G.722 - basically the complexity of a media gateway. Of course you will not get the full fidelity of either OPUS or G.722 but basic audio communications will work fine which is all I think we can guarantee with legacy. If platforms already have other codecs (such as AMR on mobile devices) that are usable by the browser then it makes perfect sense that they be included in the offer but I don't think IETF should start recommending other codecs to implement other than the 2 MTI. This should be left as product decisions based on commercial needs and not recommendations made by IETF the driver for which I suspect has more to do with the interests of some legacy products/deployments than those of RTCweb. Since almost every computing platform has a browser (including most mobile phones) within a few years every computing platform will have RTCweb and OPUS so the need for high fidelity legacy codec interoperability will I think become a mute point. I think the inteoperability concerns should be more focussed on the video issue where we seem to have a real problem. Andrew ----- Original Message ----- From: Roy, Radhika R CIV USARMY (US) [mailto:radhika.r.roy.civ@mail.mil] Sent: Thursday, January 17, 2013 06:13 AM Central Standard Time To: Roman Shpount <roman@telurix.com>; Martin Thomson <martin.thomson@gmail.com> Cc: rtcweb@ietf.org <rtcweb@ietf.org> Subject: Re: [rtcweb] Consensus vs. Voting (was Re: Call for Consensus Regarding Selecting Recommended Audio Codecs) (UNCLASSIFIED) Classification: UNCLASSIFIED Caveats: NONE Hi, all: A good assessment - thanks to Roman. So, the transcoding cost is enormous from both performance and HW/SW implementation point of view. In the end it may so appear that we are not hearing each other. BR/Radhika -----Original Message----- From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Roman Shpount Sent: Thursday, January 17, 2013 5:32 AM To: Martin Thomson Cc: rtcweb@ietf.org Subject: Re: [rtcweb] Consensus vs. Voting (was Re: Call for Consensus Regarding Selecting Recommended Audio Codecs) On Wed, Jan 16, 2013 at 7:03 PM, Martin Thomson <martin.thomson@gmail.com> wrote: If we don't say "webrtc implementations SHOULD implement G.722/AMR/AMR-WB", what is the failure mode for your application? Keeping in mind that - because this isn't 2119 MUST - you have to expect that some non-negligible proportion of clients will not support this no matter how much extra ink we using in printing large letters, how much pain does this really cause you? I expect that the transcoding costs are what this come down to. Does anyone care to quantify this? If common codecs are not implemented in the browser this would mean transcoding will need to be performed on some sort of server-side media gateway. There are three distinct issues we need to take into account when dealing with transcoding. I would list them in what, at least from my point of view, is the order of importance: 1. If you need to do trancoding, you will need to implement a jitter buffer on the transcoding media gateway. ICE processing and SRTP en/decoding can be performed on out of order packets as they are received. You cannot transcode out of order audio. This means audio packets would need to be delayed by the jitter buffer size. In cases of good internet connection this means 40 ms jitter buffer delay. In cases of consumer internet in US (somebody sitting on a DSL connection at home behind a WiFi router) you are typically looking at 60-80 ms jitter buffer delay. If you are dealing with international internet connections jitter of 150 ms to 200 ms is not unheard of. This means an additional delay due to jitter buffering of 40 ms (best case) to 200 ms. This is in addition to any other delays that are already present on the audio path. Adding an extra 100 ms of delay can make audio conversions very awkward or unusable. On the other hand, if the gateway were performing just ICE and SRTP, it would introduce 1-2 ms of delay at most (In this case I am talking about a software based implementation running on generic server hardware. A dedicated DSP solution would probably be even faster). 2. Audio artifacts due to transcoding. Apart from usual audio degradation due to transcoding (OPUS transcoded to AMR would sound worse then OPUS or AMR), we would also deal with double packet loss concealment. Media gateway will conceal lost packets when transcoding. Client will conceal lost packet received from the gateway. This would actually sound worse then PLC performed in one place. 3. Scalability of the transcoding gateway. Gateway which just deals with ICE processing and SRTP en/decoding can handle from 2000 to 10000 concurrent call when running on a generic server CPU (different scalability is due to differences in CPU performance and presence of AES specific instructions). Gateway that would do G.722 to OPUS transcoding would most likely handle from 500 to 1000 concurrent calls. We are looking at 10x difference in performance. If we need to transcode AMR to OPUS the difference would be even higher. This translates in 10x difference in hardware, data center, power, and operations costs. _____________ Roman Shpount Classification: UNCLASSIFIED Caveats: NONE --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. 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- Re: [rtcweb] Call for Consensus Regarding Selecti… Roman Shpount
- Re: [rtcweb] Call for Consensus Regarding Selecti… Burger Eric
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Emil Ivov
- [rtcweb] Call for Consensus Regarding Selecting R… Magnus Westerlund
- Re: [rtcweb] Call for Consensus Regarding Selecti… Markus.Isomaki
- Re: [rtcweb] Call for Consensus Regarding Selecti… Richard Shockey
- Re: [rtcweb] Call for Consensus Regarding Selecti… James Rafferty
- [rtcweb] 答复: Call for Consensus Regarding Selecti… 邓灵莉/Lingli Deng
- Re: [rtcweb] Call for Consensus Regarding Selecti… Timothy B. Terriberry
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Richard Shockey
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Roman Shpount
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Jean-Marc Valin
- Re: [rtcweb] Call for Consensus Regarding Selecti… Hutton, Andrew
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Gunnar Hellström
- Re: [rtcweb] Call for Consensus Regarding Selecti… Bernard Aboba
- Re: [rtcweb] Call for Consensus Regarding Selecti… Gunnar Hellström
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Roman Shpount
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Eric Burger
- Re: [rtcweb] Call for Consensus Regarding Selecti… Cullen Jennings (fluffy)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Cullen Jennings (fluffy)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Bernard Aboba
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Eric Burger
- Re: [rtcweb] Call for Consensus Regarding Selecti… Ken Fischer
- Re: [rtcweb] Call for Consensus Regarding Selecti… Cullen Jennings (fluffy)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Harald Alvestrand
- Re: [rtcweb] Call for Consensus Regarding Selecti… Steve Sokol
- Re: [rtcweb] Call for Consensus Regarding Selecti… Koen Vos
- Re: [rtcweb] Call for Consensus Regarding Selecti… Markus.Isomaki
- Re: [rtcweb] Call for Consensus Regarding Selecti… Markus.Isomaki
- Re: [rtcweb] Call for Consensus Regarding Selecti… Randell Jesup
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Andrew Allen
- Re: [rtcweb] Call for Consensus Regarding Selecti… Hutton, Andrew
- Re: [rtcweb] Call for Consensus Regarding Selecti… Rauschenbach, Uwe (NSN - DE/Munich)
- Re: [rtcweb] Call for Consensus Regarding Selecti… stephane.proust
- Re: [rtcweb] Call for Consensus Regarding Selecti… stephane.proust
- Re: [rtcweb] Call for Consensus Regarding Selecti… Harald Alvestrand
- Re: [rtcweb] Call for Consensus Regarding Selecti… Paul Coverdale
- Re: [rtcweb] Call for Consensus Regarding Selecti… Paul Coverdale
- Re: [rtcweb] Call for Consensus Regarding Selecti… Andrew Allen
- Re: [rtcweb] Call for Consensus Regarding Selecti… Bernard Aboba
- Re: [rtcweb] Call for Consensus Regarding Selecti… Romascanu, Dan (Dan)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Shida Schubert
- Re: [rtcweb] Call for Consensus Regarding Selecti… R.Jesske
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Roman Shpount
- Re: [rtcweb] Call for Consensus Regarding Selecti… Bernard Aboba
- [rtcweb] Consensus vs. Voting (was Re: Call for C… Adam Roach
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Tim Panton
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Tim Panton
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Adam Roach
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Jean-Marc Valin
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Adam Roach
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Harald Alvestrand
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Adam Roach
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Call for Consensus Regarding Selecti… Stefan Håkansson LK
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Rauschenbach, Uwe (NSN - DE/Munich)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Jean-Marc Valin
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Flynn, Gerry J
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Rauschenbach, Uwe (NSN - DE/Munich)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Martin Thomson
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Matthew Kaufman
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Burger Eric
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… DRAGE, Keith (Keith)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Martin Thomson
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Adam Roach
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roy, Radhika R CIV USARMY (US)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roy, Radhika R CIV USARMY (US)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Andrew Allen
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Stefan Håkansson LK
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Rauschenbach, Uwe (NSN - DE/Munich)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Burger Eric
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Stefan Håkansson LK
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Tim Panton
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Adam Roach
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Rauschenbach, Uwe (NSN - DE/Munich)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Tim Panton
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Tim Panton
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roman Shpount
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Roy, Radhika R CIV USARMY (US)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Andrew Allen
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Cameron Byrne
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Xavier Marjou
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… stephane.proust
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… stephane.proust
- Re: [rtcweb] Call for Consensus Regarding Selecti… Cameron Byrne
- Re: [rtcweb] Call for Consensus Regarding Selecti… stephane.proust
- Re: [rtcweb] Call for Consensus Regarding Selecti… Roman Shpount
- Re: [rtcweb] Call for Consensus Regarding Selecti… Mark Rejhon
- Re: [rtcweb] Call for Consensus Regarding Selecti… Mark Rejhon
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Matthew Kaufman
- Re: [rtcweb] Call for Consensus Regarding Selecti… Andrew Allen
- Re: [rtcweb] Call for Consensus Regarding Selecti… Andrew Allen
- Re: [rtcweb] Call for Consensus Regarding Selecti… Steve Sokol
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Andrew Allen
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Steve Sokol
- Re: [rtcweb] Call for Consensus Regarding Selecti… Eric Burger
- Re: [rtcweb] Call for Consensus Regarding Selecti… Burger Eric
- Re: [rtcweb] Call for Consensus Regarding Selecti… DRAGE, Keith (Keith)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Martin Thomson
- Re: [rtcweb] Call for Consensus Regarding Selecti… Andrew Allen
- Re: [rtcweb] Call for Consensus Regarding Selecti… Adam Roach
- Re: [rtcweb] Call for Consensus Regarding Selecti… Hutton, Andrew
- Re: [rtcweb] Call for Consensus Regarding Selecti… Olle E. Johansson
- Re: [rtcweb] Call for Consensus Regarding Selecti… Tim Panton
- Re: [rtcweb] Call for Consensus Regarding Selecti… DRAGE, Keith (Keith)
- Re: [rtcweb] Call for Consensus Regarding Selecti… Martin Thomson
- Re: [rtcweb] Call for Consensus Regarding Selecti… Martin J. Dürst
- Re: [rtcweb] Call for Consensus Regarding Selecti… Hadriel Kaplan
- Re: [rtcweb] Call for Consensus Regarding Selecti… Cullen Jennings (fluffy)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Cullen Jennings (fluffy)
- Re: [rtcweb] Consensus vs. Voting (was Re: Call f… Jean-Marc Valin