Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multi-party-rtt-mix-08.txt
Gunnar Hellström <gunnar.hellstrom@ghaccess.se> Sun, 30 August 2020 06:20 UTC
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From: Gunnar Hellström <gunnar.hellstrom@ghaccess.se>
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multi-party-rtt-mix-08.txt
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I would appreciate comments and reviews on this draft. Other organizations want to refer to it. After some variations of the method to carry multi-party real-time text in the previous versions, we are now back to a simple RFC 4103 and single RTP stream solution with source indicated in CSRC of the RTP packets. In fact it is the same as in the expired predecessor draft-hellstrom-text-conference-04, just more elaborated, with negotiation by an SDP attribute and an explicit fallback method for cases when the endpoint does not support true multi-party presentation. This was the way recommended by the avtcore session in IETF 108. I hope you also find it to be the right way to go. Regards Gunnar -------------------------------- Gunnar Hellström GHAccess gunnar.hellstrom@ghaccess.se Den 2020-08-12 kl. 20:52, skrev Gunnar Hellström: > A new version of the "RTP-mixer formatting of multi-party Real-time > text" is available. > > This version moves forward with only two methods for multi-party > mixing of RTP transported real-time text. > > The major one is RFC 4103 with transmission interval of 100 ms when > there is text from more than one source to transmit, and source > indicated in the CSRC list. > > The second one is the fallback for the situation that the endpoint > does not have multi-party capability. > > Regards > > Gunnar > > Den 2020-08-12 kl. 20:44, skrev internet-drafts@ietf.org: >> A New Internet-Draft is available from the on-line Internet-Drafts >> directories. >> This draft is a work item of the Audio/Video Transport Core >> Maintenance WG of the IETF. >> >> Title : RTP-mixer formatting of multi-party >> Real-time text >> Author : Gunnar Hellstrom >> Filename : draft-ietf-avtcore-multi-party-rtt-mix-08.txt >> Pages : 36 >> Date : 2020-08-12 >> >> Abstract: >> Real-time text mixers for multi-party sessions need to identify the >> source of each transmitted group of text so that the text can be >> presented by endpoints in suitable grouping with other text from the >> same source. >> >> Regional regulatory requirements specify provision of real-time text >> in multi-party calls. RFC 4103 mixer implementations can use >> traditional RTP functions for source identification, but the mixer >> source switching performance is limited when using the default >> transmission characteristics with redundancy. >> >> Enhancements for RFC 4103 real-time text mixing is provided in this >> document, suitable for a centralized conference model that enables >> source identification and source switching. The intended use is for >> real-time text mixers and multi-party-aware participant endpoints. >> The specified mechanism build on the standard use of the CSRC >> list in >> the RTP packet for source identification. The method makes use of >> the same "text/red" format as for two-party sessions. >> >> A capability exchange is specified so that it can be verified that a >> participant can handle the multi-party coded real-time text stream. >> The capability is indicated by use of a media attribute >> "rtt-mix-rtp- >> mixer". >> >> The document updates RFC 4103[RFC4103] >> >> A specifications of how a mixer can format text for the case when >> the >> endpoint is not multi-party aware is also provided. >> >> >> The IETF datatracker status page for this draft is: >> https://datatracker.ietf.org/doc/draft-ietf-avtcore-multi-party-rtt-mix/ >> >> There are also htmlized versions available at: >> https://tools.ietf.org/html/draft-ietf-avtcore-multi-party-rtt-mix-08 >> https://datatracker.ietf.org/doc/html/draft-ietf-avtcore-multi-party-rtt-mix-08 >> >> >> A diff from the previous version is available at: >> https://www.ietf.org/rfcdiff?url2=draft-ietf-avtcore-multi-party-rtt-mix-08 >> >> >> >> Please note that it may take a couple of minutes from the time of >> submission >> until the htmlized version and diff are available at tools.ietf.org. >> >> Internet-Drafts are also available by anonymous FTP at: >> ftp://ftp.ietf.org/internet-drafts/ >> >> >> _______________________________________________ >> Audio/Video Transport Core Maintenance >> avt@ietf.org >> https://www.ietf.org/mailman/listinfo/avt
- [AVTCORE] I-D Action: draft-ietf-avtcore-multi-pa… internet-drafts
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-mult… Gunnar Hellström
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-mult… Gunnar Hellström
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-mult… James Hamlin
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-mult… Gunnar Hellström
- [AVTCORE] draft-ietf-avtcore-multi-party-rtt-mix-… Gunnar Hellström
- Re: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-… Paul Kyzivat
- Re: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-… Gunnar Hellström
- Re: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-… Paul Kyzivat
- Re: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-… Gunnar Hellström