Re: [MMUSIC] BUNDLE and RTCP
Christer Holmberg <christer.holmberg@ericsson.com> Mon, 19 October 2015 16:40 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] BUNDLE and RTCP
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Date: Mon, 19 Oct 2015 16:40:43 +0000
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Subject: Re: [MMUSIC] BUNDLE and RTCP
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Hi, > Good discussion. > > How about the following: > > If there is an RTP m-line in the bundle, and rtcp-mux is *not* negotiated, then the rtcp port is determined according to the rules > for the first m-line selected in the bundle group. If *that* line has, and allows, an a=rtcp, then that is used. If that line doesn't have > a=rtcp, then port+1 is used, even if this isn't an rtp m-line. Sure. But, as the offerer doesn't know for sure which m- line will be selected, it always has to be prepared to use port+1, so why not use port+1 to begin with? I guess my question is whether someone really needs a=rtcp with BUNDLE? As far as I know, most current implementations do rtcp-mux, and for those that don't/can't there is always port+1. > (Right now there isn't any way to have a bundle group with more than one non-rtp m-line, but that might not always be so.) Correct. Regards, Christer On 10/19/15 3:35 AM, Christer Holmberg wrote: > Hi, > > ... > > ... > > ... > > HOWEVER, we could make it SIMPLE and either: > > 1)*Mandate usage of rtcp-mux with BUNDLE*. I.e. if BUNDLE is > negotiated, rtcp-mux MUST be used. > > This was already suggested in the past, but Paul(?) said we should > not make such restriction without a good reason. I think the current > issue is a good reason :) > > m=data channel 10000 > > m=rtp 11111 > > a=rtcp-mux > > m=rtp 11222 > > a=rtcp-mux > > 2)*Mandate usage of either rtcp-mux OR the default "+1" port with > BUNDLE*. I.e. if BUNDLE is negotiated, rtcp-mux or "+1" MUST be > used. The selection is based on whether the rtcp-mux attribute was > included in the offer/answer or not. > > m=data channel 10000 // rtcp-mux > > m=rtp 11111 > > a=rtcp-mux > > m=rtp 11222 > > a=rtcp-mux > > m=data channel 10000 // "+1" > > m=rtp 11111 > > m=rtp 11222 > > The solutions above would not allow explicit negotiation of an RTCP > port when BUNDLE is used, but maybe we could live with that? > >>Well, I could live with both of your suggestions, but I thought you > wanted a solution that can also negotiate which a=rtcp attribute to use. > >>If nobody really needs something like that , I would prefer 1) as it > removes the needs for several implementation option that would only be > needed to cover full backwards compatibility but would hardly be used. > > Personally I don't have a strong preference, but as far as I know > there may be environments where separate ports for RTP and RTCP are > desired - even if BUNDLE is used. > >>>Now, if we can agree on a way forward before Yokohama, you won't have >>>to > sit listening to me talking about BUNDLE at the meeting :) >> >>Well, I wouldn't be sitting there anyhow but understand that your > motivation to speak there about BUNDLE again is probably limited. > > I don't mind talking about BUNDLE - but I'd like to talk about it in > the context of the great RFC that we have published :) > > Regards, > > Christer > > > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic > _______________________________________________ mmusic mailing list mmusic@ietf.org https://www.ietf.org/mailman/listinfo/mmusic
- [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Thomas Stach
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Thomas Stach
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Paul Kyzivat
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Paul Kyzivat
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Roman Shpount
- Re: [MMUSIC] BUNDLE and RTCP Wyss, Felix
- Re: [MMUSIC] BUNDLE and RTCP Jonathan Lennox
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg