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Re: [MEDIA_PIPELINE_TF] ISSUE-34: ViewPort-Support

From: Scott Wilson <scott.bradley.wilson@gmail.com>
Date: Wed, 10 Aug 2011 13:15:09 +0100
Cc: public-web-and-tv@w3.org
Message-Id: <BD33E8ED-D5BD-469F-ABAB-F7731E16D188@gmail.com>
To: Cyril Concolato <cyril.concolato@telecom-paristech.fr>

On 10 Aug 2011, at 12:19, Cyril Concolato wrote:

> Sylvia,
> 
> Le 10/08/2011 11:46, Silvia Pfeiffer a écrit :
>> On Wed, Aug 10, 2011 at 5:22 PM, Cyril Concolato
>> <cyril.concolato@telecom-paristech.fr>  wrote:
>>> Hi Sylvia,
>>> 
>>> Le 10/08/2011 02:38, Silvia Pfeiffer a écrit :
>>>> 
>>>> I wonder if instead it might be worth analysing if we can come up with
>>>> a<track>    kind that allows overlaying hyperlinkable regions onto the
>>>> video?
>>> 
>>> Why wouldn't it be possible to have a track element point to some animated
>>> SVG file?
>> 
>> The<track>  element points to timed text, i.e. to a file that provides
>> text fragments along the timeline of the video. SVG is not suitable
>> for that use.
> The fact that the spec puts a restriction is one aspect. I would be happy to know the rationale for it. But I think such restriction however could be removed. From an implementation point of view, we've done it in GPAC [1], it perfectly makes sense to consider SVG as an additional track to a video/audio media. It can be used for subtitling (yet another format), animated graphics (think about dynamic and synchronized ads, ...), regions of interests (See for example [2]).

Well, right now you could use a <track> pointing to an SVG file if you wanted to. I don't think thats a significant restriction.

The real question is - will browsers implement support for SVG documents linked in <track> elements, or just WebVTT/Subrip formatted synchronized text files?

And what about SMIL[1]?

[1] http://www.w3.org/TR/SMIL/



> 
>> Just like you cannot put a SVG into a<audio>  or<video>
>> element, you won't be able to put a SVG into a<track>  element.
> That's a separate issue on which we could also argue.
> 
> Regards,
> 
> cyril
> 
> [1] http://gpac.sf.net
> [2] http://biblio.telecom-paristech.fr/cgi-bin/download.cgi?id=10647
> -- 
> Cyril Concolato
> Maître de Conférences/Associate Professor
> Groupe Multimedia/Multimedia Group
> Telecom ParisTech
> 46 rue Barrault
> 75 013 Paris, France
> http://concolato.wp.institut-telecom.fr/
> 
Received on Wednesday, 10 August 2011 12:15:48 UTC

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