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[Bug 13544] Video: <track> element should allow support of more than one format without content sniffing

From: <bugzilla@jessica.w3.org>
Date: Wed, 03 Aug 2011 08:44:24 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1QoX3w-0006ga-Pt@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13544

--- Comment #6 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2011-08-03 08:44:24 UTC ---
(In reply to comment #4)
> (In reply to comment #2)
> > The author should be able to specify a default track per track file type.
> > http://dev.w3.org/html5/spec/Overview.html#dom-track-default
> > 
> > The author might have the same content published in (for example) .ttml and
> > .vtt, and may want to set a default in case two user agents don't suppot the
> > same track file types.
> > 
> > Also, setting the type on the track itself seems simpler:
> > 
> > <video src="v.mp4">
> >  <track kind=captions src=v.en.ttml srclang=en label="English" default>
> >  <track kind=captions src=v.de.ttml srclang=de label="German">
> >  <track kind=captions src=v.en.vtt srclang=en label="English" default>
> >  <track kind=captions src=v.de.vtt srclang=de label="German">
> > </video>
> 
> Hmm, if the ttml and vtt english caption tracks are alternatives with
> essentially the same content, there should only ever one be chosen between
> them. So, putting them in a <source> would make more sense, don't you think?
> 
> Also, there can only be a single @default attribute - it would be very
> confusing to have several. Which one would a browser choose if it supports all
> of the formats?


Should have added: this is the way in which I would specify your example:

<video src="v.mp4">
 <track kind=captions srclang=en label="English" default>
  <source src=v.en.ttml type="text/ttml">
  <source src=v.en.vtt type="text/vtt">
 </track>
 <track kind=captions srclang=de label="German">
  <source src=v.de.ttml type="text/ttml">
  <source src=v.de.vtt type="text/vtt">
 </track>
</video>

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Received on Wednesday, 3 August 2011 08:44:26 UTC

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