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Re: [SVG 1.2] 7 multimedia

From: Antoine Quint <ml@graougraou.com>
Date: Sat, 15 Nov 2003 17:14:33 +0100
Message-Id: <CCEC0E4E-1786-11D8-BD45-000393D124C4@graougraou.com>
Cc: "Jim Ley" <jim@jibbering.com>, <www-svg@w3.org>, "Patrick Schmitz" <cogit@ludicrum.org>
To: "Sigurd Lerstad" <sigler@bredband.no>

Hi Sigur,

>> As I understand, like with any element, if the "begin" attribute has a
>> negative value, the media will be started by the offset specified. 
>> This
>> remains to be checked as I don't have an implementation on my machine
>> that implements this (ASV6 seems not to). I copied Patrick Schmitz, he
>> should know (I may very well be talking nonsense here)...
>
> What about the clipBegin attribute from SMIL

It is not supported in SVG as far as I know. SVG is just a host 
language for SMIL Animation and does not have the same feature. 
Likewise, the newly-introduced <audio> and <video> elements are SVG 
elements, not SMIL.

> Using a negative begin would require you wrap the media element in 
> another
> time container, and set the begin value of when you really want to 
> start the
> media on the time container instead of on the media element itself.

In SVG, there is no need to wrap in another time container, offset 
times are relative to document begin. See SVG 1.1 spec [0]:

"For SMIL Animation, this describes the element begin as an offset from 
an implicit syncbase. For SVG, the implicit syncbase begin is defined 
to be relative to the document begin. Negative begin times are entirely 
valid and easy to compute, as long as there is a resolved document 
begin time."

Antoine

[0] http://www.w3.org/TR/SVG11/animate.html#TimingAttributes
-- 
Antoine Quint <aq@fuchsia-design.com>
W3C SVG Working Group Invited Expert
SVG Consulting, Teaching and Outsourcing
Fuchsia Design <http://www.fuchsia-design.com/>
Received on Saturday, 15 November 2003 11:15:21 GMT

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