Re: [Rmt] time-lined static media with FLUTE & IMG
Magnus Westerlund <magnus.westerlund@ericsson.com> Thu, 30 October 2003 10:01 UTC
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Date: Thu, 30 Oct 2003 11:00:27 +0100
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Rod.Walsh@nokia.com
CC: rmt@ietf.org, Ross Finlayson <finlayson@live.com>
Subject: Re: [Rmt] time-lined static media with FLUTE & IMG
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Hi, Sorry that it has taken some time to answer this mail. However I needed to do some reading. It is also interesting that I only received a single copy of this mail instead of the 4 that I should have received. I will start to declare that I have not spent more time on this problem, and actually have dropped the RTP idea for this. The combination of binary objects with certain timing relations with continuos media is actual a hugh area, reaching into many areas. I think that for a multicast session the usage of FLUTE to deliver the media works. As the transmission is unidirectional the sender can co-ordinate this with real-time media to ensure that bit-rate is used in a meaningful way. However I would like here to point out that the usage of congestion control or multi-layered transmission may be less useful. You still need to transmit the data so that the lowest bit-rate version has a good chance to reach the destinations. Having more layers would of possibly be able to increase the chance of delivery, however if you anyway has no congestion problem then there should be no problem of receiving the data with the single channel. The larger problem as I see it is how to synchronize the time-lined static media objects with the continuos media. When I started looking at this problem we envisioned using SMIL. However this requires one to define a caching structure and having URI resolutions into that cache of objects. There are other scenarios where on needs to thing on how synchronize or bind data together. What I understand of the RMT work is that you haven't really look into how to define session descriptions that actually work with any protocol instantiation. But as conclusion, this topic needs a lot of further work. I think one needs to start looking at the requirements then see how the currently available protocols can be combined and where parts are missing. Cheers Magnus Rod.Walsh@nokia.com wrote: > Hi Magnus, Ross (and everyone) > > 1½-2 years back there was a draft on time-lined static media (draft-westerlund-avt-rtp-static-media-01) - basically to send files, text (etc) with timed presentation along with AV media streams. Since the basic requirements haven't gone away, but RMT has made progress on usable protocols, what do you think about using FLUTE (draft-ietf-rmt-flute-02) for the same job? With a quick comparison I think it should be pretty straight forward, although you may have some preferences (or extensions to the FLUTE-FDT) if you already have a working RTP-payload'ed implementation. > > Ross mentioned sending ID-3 tags in-band with audio streams. Any ideas you have on doing this with FLUTE (ID3) and RTP (music) could be pretty useful for the Internet Media Guide (IMG) work in MMUSIC - how to move around (and announce) metadata for 'foo' multicast and unicast sessions. > > Cheers, Rod. > > _______________________________________________ > Rmt mailing list > Rmt@ietf.org > https://www1.ietf.org/mailman/listinfo/rmt > > -- Magnus Westerlund Multimedia Technologies, Ericsson Research EAB/TVA/A ---------------------------------------------------------------------- Ericsson AB | Phone +46 8 4048287 Torshamsgatan 23 | Fax +46 8 7575550 S-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com _______________________________________________ Rmt mailing list Rmt@ietf.org https://www1.ietf.org/mailman/listinfo/rmt
- [Rmt] time-lined static media with FLUTE & IMG Rod.Walsh
- Re: [Rmt] time-lined static media with FLUTE & IMG Magnus Westerlund
- RE: [Rmt] time-lined static media with FLUTE & IMG toni.paila
- Re: [Rmt] time-lined static media with FLUTE & IMG Magnus Westerlund