[AVTCORE] RTP Retransmission and RID
Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 04 December 2018 09:23 UTC
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "avt@ietf.org" <avt@ietf.org>
Thread-Topic: RTP Retransmission and RID
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Date: Tue, 04 Dec 2018 09:23:31 +0000
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Subject: [AVTCORE] RTP Retransmission and RID
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WG, We are currently having a discussion on the RTCWeb WG mailing list regarding RID and RTP Retransmission (RTX) using RFC 4588. In that discussion I think there are three things worth noting. 1) That RFC4588 handling of RTP Header Extensions may actually needs specific rules for the RID related header extensions (RtpStreamId and RepairedRtpStreamId) that are defined in https://datatracker.ietf.org/doc/draft-ietf-avtext-rid/. The reason is that the reconstructed packet clearly needs to have its RtpStreamId header extension if the original packet had it. Secondly to enable that one actually explicitly indicates the particular repair RTP stream that carries the RTX relation to its source stream using the RID mechanism one need to add a RepairedRtpStreamId header extension to the repair packet also in some cases like stream start or at certain session participant changes. 2) There was discussion if for media sources that has only a single source RTP stream if that binding between source and repair RTP streams are accomplished using MIDs in SDES items or header extensions? 3) As the current late binding mechanism has some shortcomings, like not allowing NACKing multiple streams that not yet have an established binding as well as not handling dynamic rebinding well there is the question if there should be an updated recommendation for how one should accomplish the binding between repair and source RTP streams for the RFC 4588 mechanism? I do note that RID is not capable of addressing the case with separate RTP sessions for source and repair as RID has a scope that can't reach over multiple RTP sessions. So how do we handle this, especially 1 appears to need a resolution. Cheers Magnus Westerlund ---------------------------------------------------------------------- Network Architecture & Protocols, Ericsson Research ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Torshamnsgatan 23 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [AVTCORE] RTP Retransmission and RID Magnus Westerlund