Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp-00.txt
Harald Alvestrand <harald@alvestrand.no> Mon, 15 August 2011 15:13 UTC
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Date: Mon, 15 Aug 2011 17:14:02 +0200
From: Harald Alvestrand <harald@alvestrand.no>
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Subject: Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp-00.txt
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On 08/15/11 16:52, Randell Jesup wrote: > On 8/15/2011 4:20 AM, Harald Alvestrand wrote: > >> On 08/12/11 17:24, Paul Kyzivat wrote: >>> That brings up another peculiar case. Suppose the m-lines in question >>> were, in order, video, audio, and timed text, and the answerer again >>> only wanted to use audio and timed text. In that case, will it still >>> want to use the port offered for video??? How would the answer be >>> constructed, and where would the answering port be placed? >> That is a strong argument in favour of "just don't give any codecs". I'm >> adding that too. > > If you're suggesting "m=video 4321 RTP/AVP" as an SDP line, it's > illegal to > not have a payload listed, I'm afraid (though many implementations > will accept > it). That includes when you reject an m= line with port 0. Hm. Yes, since a=rtpmap attributes are only required for dynamic numbers, leaving all the a=rtpmap: attributes out doesn't help, and the grammar of the m= line is given in RFC 4566 as m=<media> <port> <proto> <fmt> ... which seems like "one or more". So scratch that idea. > >>> It occurs to me that there is another "special" port that might be >>> co-opted for use here: port 9, the discard port. >> Magic numbers are bad for technological health. I don't think I'd like >> to see that. > > Agreed, though occasionally it's ok, even if not optimal (port 0 for > reject for example). > > Yup, zero and one are kind of OK to have magical.
- [rtcweb] Fwd: I-D Action: draft-alvestrand-one-rt… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Paul Kyzivat
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Ross Finlayson
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Muthu Arul Mozhi Perumal (mperumal)
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Muthu Arul Mozhi Perumal (mperumal)
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Paul Kyzivat
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Paul Kyzivat
- [rtcweb] Combining attributes (Re: Fwd: I-D Actio… Harald Alvestrand
- Re: [rtcweb] draft-alvestrand-one-rtp-00.txt ICE … Paul Kyzivat
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Randell Jesup
- Re: [rtcweb] draft-alvestrand-one-rtp-00.txt ICE … Randell Jesup
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Justin Uberti
- Re: [rtcweb] draft-alvestrand-one-rtp-00.txt ICE … Paul Kyzivat
- [rtcweb] draft-alvestrand-one-rtp-00.txt and inte… Christer Holmberg
- Re: [rtcweb] draft-alvestrand-one-rtp-00.txt and … Christer Holmberg
- Re: [rtcweb] draft-alvestrand-one-rtp-00.txt and … Harald Alvestrand
- Re: [rtcweb] draft-alvestrand-one-rtp-00.txt and … Christer Holmberg
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Harald Alvestrand
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Randell Jesup
- Re: [rtcweb] I-D Action: draft-alvestrand-one-rtp… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Muthu Arul Mozhi Perumal (mperumal)
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Harald Alvestrand
- Re: [rtcweb] Fwd: I-D Action: draft-alvestrand-on… Colin Perkins