[p2p-hackers] Live P2P Video State of the Art

[cefn.hoile at bt.com]

In contrast to the single-source, multiple recipients model, tvoon in Germany have been exploring a multiple-source, multiple recipients model for live streams.

Where live streams are distributed by a broadcaster they are then decodable at multiple locations (e.g. satellite and digital TV DVB cards). These locations can cooperate to provide an always-on service to relay the signal regardless of your reception of the original RF. 

As with many of these projects I understand they ran into some issues around copyright, and I don't know how these panned out in the end.

http://www.tvoon.de/ctv/

BT's also got some activities in the P2P multicast space, including Dimitris' work on VidTorrent (BT Fellow at the MIT Media Lab). 

Hoping to develop a broader collaboration to trial ESM, VidTorrent and other multicast frameworks. Would welcome suggestions for other systems which we should be looking at.

Cefn
http://cefn.com
BT Labs
http://labs.bt.com

-----Original Message-----
From: p2p-hackers-bounces at zgp.org on behalf of David Barrett
Sent: Sun 10/30/2005 8:54 PM
To: p2p-hackers at zgp.org
Subject: [p2p-hackers] Live P2P Video State of the Art
 
We've talked at length about massively scalable file transfer, but we've 
generally presumed fixed-length, pre-recorded files (ie, the file is 
available in entirety before sharing).  I'm curious if you have 
experience or ideas around "live" streaming of content simultaneous to 
its recording/creation.

Clearly, this isn't a new field, and streaming architectures abound.  
But while there has been extensive innovation in file sharing (DHTs, 
merkle trees, swarming downloads), I haven't heard much innovation with 
live streaming content.

So far as I know (but I'm asking you to prove me wrong), the state of 
the art in audio/video streaming is still a classic "hierarchy of 
repeaters", where the broadcaster sends to N receivers, each of which 
sends to N receivers, and so on.  There are obvious variations on this 
theme (adaptive fan out, topology optimizations, re-request of dropped 
data, jitter buffers, etc) but I'm looking for the next major innovation 
(such as was taken between Napster and Gntella for file sharing).

With this in mind, do you know of any proven techniques (or new 
research) in grid/swarming delivery of live video?  Which research, 
projects, or products would you say are demonstrating the state of the 
art in scalable, adaptive, high-quality video streaming?

-david
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