Re: [MMUSIC] RFC 6190 Single Session Transport
"Roni Even" <ron.even.tlv@gmail.com> Thu, 22 August 2013 09:08 UTC
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From: Roni Even <ron.even.tlv@gmail.com>
To: 'Jonathan Lennox' <jonathan@vidyo.com>, 'Bernard Aboba' <bernard_aboba@hotmail.com>
References: <BLU169-W630D4FBAA70899F6C54A0593830@phx.gbl>, <3879D71E758A7E4AA99A35DD8D41D3D91D487E63@xmb-rcd-x14.cisco.com>, <EE556E46-54C1-4AAB-B03A-56FB8971D8A2@vidyo.com> <BLU169-W1208949649FACAC3137B05C93630@phx.gbl> <3AD93742-DBA4-4EDD-80AD-A667994ECE8D@vidyo.com>
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Date: Thu, 22 Aug 2013 12:05:13 +0300
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Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] RFC 6190 Single Session Transport
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Hi Jonathan, Maybe if you want to use FEC only on the base layer and not on all layers. Roni From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf Of Jonathan Lennox Sent: 19 July, 2013 5:54 PM To: Bernard Aboba Cc: mmusic@ietf.org Subject: Re: [MMUSIC] RFC 6190 Single Session Transport On Jul 18, 2013, at 10:02 PM, Bernard Aboba <bernard_aboba@hotmail.com> wrote: Jonathan said: "I don't understand how single-session multi-source transmission will work without either a) signaling "a=ssrc-group DDP" decoding dependencies, or b) making various implementation-specific assumptions about the structure of the SVC streams." [BA] In terms of SDP choices for expressing layering within a single m line, you can either go the a=ssrc-group:DDP route, or use distinct payload types for each layer and RFC 5583 a=group:DDP (this is what "Unified Plan" Section 4.7 appears to advocate). I'm not sure how "MST within a single session" could be expressed in SDP without BUNDLE. Was the idea to use multiple m lines and group them together but use the same port? I think the authors of RFC 6190 didn't see a use case for MST within a single RTP session -- all of the interesting MST use cases they saw involved separate transport flows for the separate layers, and if you're sending all the layers on a single transport flow, SST is significantly simpler. What requirement are you trying to achieve that's met by MST in a single session, but not by SST? -- Jonathan Lennox jonathan@vidyo.com
- [MMUSIC] RFC 6190 Single Session Transport Bernard Aboba
- Re: [MMUSIC] RFC 6190 Single Session Transport Adam Roach
- Re: [MMUSIC] RFC 6190 Single Session Transport Mo Zanaty (mzanaty)
- Re: [MMUSIC] RFC 6190 Single Session Transport Bernard Aboba
- Re: [MMUSIC] RFC 6190 Single Session Transport Jonathan Lennox
- Re: [MMUSIC] RFC 6190 Single Session Transport Bernard Aboba
- Re: [MMUSIC] RFC 6190 Single Session Transport Jonathan Lennox
- Re: [MMUSIC] RFC 6190 Single Session Transport Roni Even
- Re: [MMUSIC] RFC 6190 Single Session Transport Mo Zanaty (mzanaty)