Re: [rtcweb] Number of samples (ptime) to be supported by required codecs (draft-ietf-rtcweb-audio-05)
"DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com> Tue, 25 February 2014 17:53 UTC
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From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
To: Magnus Westerlund <magnus.westerlund@ericsson.com>, Harald Alvestrand <harald@alvestrand.no>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] Number of samples (ptime) to be supported by required codecs (draft-ietf-rtcweb-audio-05)
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Date: Tue, 25 Feb 2014 17:53:34 +0000
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Archived-At: http://mailarchive.ietf.org/arch/msg/rtcweb/8lxh24LsRP69ED_Cczwln4NbMkI
Subject: Re: [rtcweb] Number of samples (ptime) to be supported by required codecs (draft-ietf-rtcweb-audio-05)
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I agree with Haralds comments on this. I do not see any point in writing RTCWEB specific requirements on this. Keith > -----Original Message----- > From: rtcweb [mailto:rtcweb-bounces@ietf.org] On Behalf Of > Magnus Westerlund > Sent: 25 February 2014 10:24 > To: Harald Alvestrand; rtcweb@ietf.org > Subject: Re: [rtcweb] Number of samples (ptime) to be > supported by required codecs (draft-ietf-rtcweb-audio-05) > > On 2014-02-19 19:11, Harald Alvestrand wrote: > > On 02/19/2014 09:16 AM, Magnus Westerlund wrote: > >> On 2014-02-18 23:58, Harald Alvestrand wrote: > >>> I may be a little simple-minded, but if we have a recommendation > >>> that receivers MUST be able to receive all packetizations > of G.711 > >>> and OPUS up to 200 ms per packet, and that receivers > should signal > >>> this by sending "a=maxptime:200" in their SDP, what > situations exist > >>> where interoperability is not going to be achieved? > >> Interoperability is going to be achieve in the direction > towards this > >> endpoint. The question is if we achieve interoperability in the > >> direction from that endpoint. > > > > So, given that there is nothing in the G.711 specification > about which > > sample sizes a G.711 receiver has to support - the right approach > > seems to be to amend the G.711 MIME registration with this > information. > > Yes, it would for the future. But considering the wide-spread > deployment of this payload format I don't see that having any > short term effect on the interoperability. > > Also, the recommendations are actually context dependent. > Thus, it is not obvious that a single recommendation is suitable. > > > > > This is not a WebRTC issue; it is an absence of > specification for the > > non-WebRTC devices that use G.711. The RTCWEB specifications can > > reasonably be expected to point to existing information about this > > issue; it is not reasonable (in my mind) that the RTCWEB WG decide > > what these values should be. > > > > I would argue for this consideration based on that this is > done in the WebRTC context, not any other context. > > Cheers > > Magnus Westerlund > > ---------------------------------------------------------------------- > Services, Media and Network features, Ericsson Research EAB/TXM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > Färögatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >
- [rtcweb] Number of samples (ptime) to be supporte… Magnus Westerlund
- Re: [rtcweb] Number of samples (ptime) to be supp… Harald Alvestrand
- Re: [rtcweb] Number of samples (ptime) to be supp… Magnus Westerlund
- Re: [rtcweb] Number of samples (ptime) to be supp… Harald Alvestrand
- Re: [rtcweb] Number of samples (ptime) to be supp… Magnus Westerlund
- Re: [rtcweb] Number of samples (ptime) to be supp… DRAGE, Keith (Keith)
- Re: [rtcweb] Number of samples (ptime) to be supp… Harald Alvestrand
- Re: [rtcweb] Number of samples (ptime) to be supp… Magnus Westerlund