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[icnrg] I-D Action: draft-irtf-icnrg-videostreaming-03.txt

Marie-Jose Montpetit <mariejo@mit.edu> Tue, 17 March 2015 16:17 UTC

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From: Marie-Jose Montpetit <mariejo@mit.edu>
To: icnrg <icnrg@irtf.org>
Thread-Topic: [icnrg] I-D Action: draft-irtf-icnrg-videostreaming-03.txt
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Date: Tue, 17 Mar 2015 16:17:17 +0000
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Cc: "Liushucheng (Will)" <liushucheng@huawei.com>, Börje Ohlman <Borje.Ohlman@ericsson.com>, "oran@cisco.com" <oran@cisco.com>, "Dr. Jianping Wang" <jianwang@cityu.edu.hk>, Dirk Kutscher <Dirk.Kutscher@neclab.eu>
Subject: [icnrg] I-D Action: draft-irtf-icnrg-videostreaming-03.txt
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Hi all:

I reviewed the draft and here are some comments. I think overall the draft does cover pretty well the "state of the art" in video/telelvision transmission and how ICNs can be included. 

1. The adaptive streaming section is particularly strong and I was thinking that the title indicates that. The rest of the draft is not about "adaptive" - should the title be changed?
2. The IPTV section takes a very traditional view of IPTV: multicast real-time. But one must not forget that a lot of implementations include "trick plays" (FF, pause and rewind) that often transform the multicast into multiple unicast. And of course in network "digital video recorders" where personal content is cached for further viewing that may of may not use multicast but could profit of course from ICNs both in changing and accessing the content. I think mentioning this would enhance that section.
3. The multiple wireless: are we thinking multipath? I think that for that ICN would be nice in providing deployment scenarios that are independent of the actual transmission.
4. While a lot of the document addresses P2P there is little mention of the other "multisource-multidestination" services that are consistent with shared video experience; these raise the issues of media synchronization across multiple networks and devices - a hard problem. Some ICN basic mechanisms (strategy layers?) could be helpful here. The multiple screen experience 
5. The network coding section could be stronger. As regards video (unicast, multicast and P2P) network coding has shown promise in reducing buffering events and improving on caching efficiency. Some of the issues raised in this section have been addressed in the network coding community (timing being one with multiple demos). And network coding is not only multistream but can also be used in-stream as an equivalent of a composable erasure code. Actually the IETF nwcrg while not addressing ICN is looking at architecture and there could be avenues for collaboration.

But again overall a good document!


I will be in Dallas and can discuss some more.


Marie-José

Marie-Jose Montpetit, Ph.D.
mariejo@mit.edu
@SocialTVMIT

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