W3C home > Mailing lists > Public > public-media-fragment@w3.org > September 2009

Re: video aspect use case

From: Philip Jägenstedt <philipj@opera.com>
Date: Wed, 09 Sep 2009 17:02:19 +0200
To: "Yves Lafon" <ylafon@w3.org>, public-media-fragment@w3.org
Message-ID: <op.uzzv15t9atwj1d@sisko.linkoping.osa>
On Wed, 09 Sep 2009 14:17:20 +0200, Yves Lafon <ylafon@w3.org> wrote:

> http://www.w3.org/2008/WebVideo/Fragments/WD-media-fragments-reqs/#scenario5.8
> [[
> Silvia's television is brand new and with a display in 16:9, however she  
> has video on her media server that are in 3:2 format. To avoid paying a  
> premium in network fees, she would like the television to request only  
> what can be displayed to avoid wasting bandwidth.
> ]]

It appears it's not well defined what aspect ratio is supposed to mean  
here. Assuming that we are using URI fragments and not query strings, the  
4:3 in video.ogg#aspect=4:3 isn't communicated to the server. I've only  
been able to understand it as forcing the aspect ratio of the resource,  
rather than somehow modifying the resource (i.e. the exact same bytes  
should be sent). The only use case I can see is fixing aspect ratio of  
broken files, which I really think could just as well be done in HTML/CSS,  
SVG, etc.

Using it to negotiate byte-different resources with the server is  
something else completely, and would require new HTTP headers. It doesn't  
seem to be worth spending time specifying in my opinion.

Philip Jägenstedt
Core Developer
Opera Software
Received on Wednesday, 9 September 2009 15:02:57 UTC

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