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[SVGMobile12] STZLC3-4 animation of xlink:href of a media

From: Jean-Claude Dufourd <jcdufourd@gmail.com>
Date: Mon, 19 Dec 2005 22:21:20 +0100
Message-ID: <43A72450.7000702@gmail.com>
To: www-svg@w3.org

We are wondering about the consequences of animating the xlink:href 
attribute of a running media.

Ex. :
<video xlink:href="vid1.3gp" begin="0s" dur="media">
  <set attributeName="xlink:href" to="vid2.3gp" begin="1s" dur="2s"/>

- at 0s, <video> renders "vid1.3gp"
- at 1s, <video> renders "vid2.3gp". Is "vid2.3gp" started at 1s into 
the media, or at its beginning ?
Should "vid1.3gp" be kept active in background ?
- at 3s, <video> renders "vid1.3gp" again. Does it restart at the 
beginning or at 3s ?
Should "vid2.3gp" be kept active in background ?

What is the effect on the timing of <video> if the implicit durations of 
"vid1.3gp" and "vid2.3gp" are different ?
Should the 'active end' be reevaluated at each change of the xlink:href 
attribute ?
What is the consequence of the connexion and buffering phase which 
appears at the change between "vid1.3gp" and "vid2.3gp" ?

We do not think the list of questions ends here. We believe this is a 
Pandora's box.
One possible solution is to adopt text to the effect that changes to 
xlink:href are only taken into account when the media element is not active.


Nicolas Pierre, Erwann Gouesbet, Julien Tranchant and
Jean-Claude Dufourd
Received on Monday, 19 December 2005 21:21:37 UTC

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