Re: [MMUSIC] Scope of RTP payload types in BUNDLE?
Colin Perkins <csp@csperkins.org> Mon, 27 May 2013 18:41 UTC
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From: Colin Perkins <csp@csperkins.org>
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Date: Mon, 27 May 2013 19:41:52 +0100
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Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] Scope of RTP payload types in BUNDLE?
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On 27 May 2013, at 19:38, Paul Kyzivat wrote: > On 5/27/13 2:10 PM, Colin Perkins wrote: >> On 27 May 2013, at 18:55, Christer Holmberg wrote: >>>>>>> v=0 >>>>>>> o=alice 2890844526 2890844526 IN IP4 host.anywhere.com s= c=IN IP4 >>>>>>> host.anywhere.com >>>>>>> t=0 0 >>>>>>> m=audio 49170 RTP/AVP 96 >>>>>>> a=rtpmap:96 AMR-WB/16000 >>>>>>> m=audio 49170 RTP/AVP ??? >>>>>>> a=rtpmap:??? AMR-WB/16000 >>>>>> >>>>>> Not sure I get your point. You can have two different payload types that map to the same payload format in a single RTP session, since >>>>>> you can always distinguish what payload format is intended. You can't have the same payload type mapping to two different payload >>>>>> formats in a single RTP session, since you can't then infer what payload format was meant. >>>>> >>>>> Please not that both PTs map to the SAME payload format :) >>>> >>>> I thought I addressed that in my reply. >>> >>> I am not sure you did - at least I didn't get it :) >>> >>> Again, my understanding of what you said is that, for any payload format within an RTP session, the PT value has to be unique. >> >> Correct. > > Now you're both confused. What you are trying to say is that for any PT value withing an RTP session the payload format must be unique. > > E.g., two different PTs may map to the same format, but one PT may not map to two different formats. > > But I continue to argue that we could relax that, as long as there is something else that selects which PT mapping to use. Yes, but why? >>> In the example above the same payload format, within the same RTP session, is used in two separate m- lines. But, I still can't use the same PT value for both m- lines, even if the payload format is the same, can I? >> >> >> Why not? I don't see any problem mapping the same payload type to the exact same payload format in two different m= lines. Mapping the same payload type to two different payload formats is the problem. > > It depends. *If* you are trying to use the PT to associate packets to an m-line, then indeed you might need to use different PT values for the same payload format in order to accomplish that. Sure, but no-one is arguing against that. The problem is using the same PT for different payload formats. -- Colin Perkins http://csperkins.org/
- [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Christer Holmberg
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Christer Holmberg
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings (fluffy)
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Emil Ivov
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Mo Zanaty (mzanaty)
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings (fluffy)
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Christer Holmberg
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Christer Holmberg
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Colin Perkins
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Bernard Aboba
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Magnus Westerlund
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Christer Holmberg
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Christer Holmberg
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Bernard Aboba
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Bernard Aboba
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Bernard Aboba
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Bernard Aboba
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? DRAGE, Keith (Keith)
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Stach, Thomas
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Stach, Thomas
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Cullen Jennings
- Re: [MMUSIC] Scope of RTP payload types in BUNDLE? Paul Kyzivat