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Re: Shared Motion - multi-device synchronization and media control for the Web.

From: Francois Daoust <fd@w3.org>
Date: Thu, 15 Jan 2015 18:38:37 +0100
Message-ID: <54B7FB1D.1020101@w3.org>
To: Giuseppe Pascale <giuseppep@opera.com>, "Vickers, Mark" <Mark_Vickers@cable.comcast.com>
CC: Ingar Mæhlum Arntzen <ingar.arntzen@gmail.com>, Sangwhan Moon <smoon@opera.com>, "public-web-and-tv@w3.org IG" <public-web-and-tv@w3.org>, Njål Borch <njaal.borch@gmail.com>, Dominique Hazaël-Massieux <dom@w3.org>
Hi Giuseppe, Mark, and Web and TV IG participants,

Jumping into the thread after the holiday season and the CES show...

On 2014-12-18 10:08, Giuseppe Pascale wrote:
> For the record, synchronization use cases and requirements have already
> been discussed at length in this IG in the past, see e.g.
> http://www.w3.org/2011/webtv/wiki/Media_APIs/Use_Cases#10._.22Use_Case_Ten_.E2.80.93_Sync_Among_Browser-_and_non-Browser_Devices.22
> but I don't think there has been any practical follow up on that for
> luck of a critical mass of contributors to the work.

Indeed, synchronization use cases keep haunting back IG discussions 
without lots of practical solutions up until now. That's the reason why 
Dom and I thought it would be a good idea to share the proposal from 
Ingar and Njål with the Web and TV IG first.

> If there is a renewed interest in doing something my recommendation
> would be to keep discussing on this list to identify what we are trying
> to achieve and if we need a spec, and if the answer to that is positive,
> to setup a CG to refine the extension proposal before submission to a
> WG, unless the conclusion is really limited to a few small changes to
> the HTML5 spec in which case it may be easier to just report bugs
> against the HTML5.1 spec.

Right, the possibilities Mark listed match what we had in mind. As 
things stand, the proposal re-uses as many existing concepts, protocols 
and formats as possible but remains slightly more involved than "just a 
few small changes to the HTML5 spec". I would assume the HTML WG would 
rather want to see a concrete specification before it takes up the work.

I encourage Web and TV IG participants to take a look at the Shared 
Motion proposal [1] and related demos [2] that show how it could enable 
the use cases discussed within the IG, and to share your thoughts, 
concerns or support.

I personally like the idea behind Shared Motion because it entirely 
separates the notion of motion from media streams, does not require a 
complex back-end server setup (a Web sockets server is typically enough) 
and can easily be used by anyone to create synchronized multimedia 
presentations. Said differently, I understood it, which is not a given 
with synchronization topics ;)

I'm sure Ingar and Njål would be more happy to push the proposal 
forward, for instance to write the extension specification, although 
only if it makes sense for others as well!


[1] https://lists.w3.org/Archives/Public/public-web-and-tv/2014Dec/0016.html
[2] https://lists.w3.org/Archives/Public/public-web-and-tv/2014Dec/0017.html
Received on Thursday, 15 January 2015 17:39:12 UTC

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