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Re: [media] Displaying Multitrack Video (issue-152)

From: Philip Jägenstedt <philipj@opera.com>
Date: Fri, 18 Feb 2011 17:14:43 +0100
To: public-html-a11y@w3.org
Message-ID: <op.vq3wqtvosr6mfa@localhost.localdomain>
On Thu, 17 Feb 2011 23:17:41 +0100, Silvia Pfeiffer  
<silviapfeiffer1@gmail.com> wrote:

> Note that I have started a page in the wiki to collect different
> rendering possibilities for multitrack video:
> http://www.w3.org/WAI/PF/HTML/wiki/Media_Multitrack_Media_Rendering
> My idea is that in order to understand what different display
> possibilities we have for multitrack video we have to analyse what
> people do now. I get the feeling that there are only a limited number
> of ways in which they can be displayed and we could possibly cover
> that with CSS. We also have to consider that we don't always have all
> the real estate of a Web page available to put multiple videos next to
> each other, because when the video goes full-screen it is no different
> to a TV display. So, getting inspiration from existing ways in which
> multiple video tracks are displayed should be a good idea. Please help
> with your images.
> If you want to contribute images but cannot upload there directly,
> feel free to email me the image and I will upload it for you.

Thanks for collecting these, Silvia.

Looking through the list, it's clear that all of these have a non-trivial  
layout of the multiple video tracks.

For example, Mlbtv_02.jpg is a baseball video with plenty of overlayed  
information together with the extra video track. The extra video track has  
a special border that fits with the rest of the presentation.

Transhud.jpg also has special UI around the overlayed video track, and it  
appears as though the many overlayed video tracks in Winclip.jpg has at  
least a thin black border.

The conclusion I draw from this is that the effects "people" want are only  
really feasible with multiple <video> elements that are positioned and  
styled with CSS. In other words, for multi-track video, we need only  
really consider the technical solutions that link together several sibling  
<video> elements.

Philip Jägenstedt
Core Developer
Opera Software
Received on Friday, 18 February 2011 16:15:18 UTC

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