[whatwg] Video, Closed Captions, and Audio Description Tracks

Henri Sivonen hsivonen at iki.fi
Tue Oct 9 09:46:03 PDT 2007

On Oct 9, 2007, at 19:24, Dave Singer wrote:
> At 10:03  +0300 9/10/07, Henri Sivonen wrote:
>> My understanding is that the purpose of this thread isn't to find  
>> a captioning spec for HTML 5 but to find the right way to do  
>> closed captions in Ogg.
> Oh.  I was under the impression that this thread was about the  
> right way to request and get captions in HTML/Web.

Yes, that also, but specifying the requesting part doesn't really  
help if there isn't advice to implementors on how to respond to the  

> How the Ogg community designs intrinsic caption support is up to  
> them, isn't it?

In theory ideally yes.

However, when HTML 5 says "User agents should support Ogg Theora  
video and Ogg Vorbis audio, as well as the Ogg container format." and  
"User agents should provide controls to enable or disable the display  
of closed captions associated with the video stream, though such  
features should, again, not interfere with the page's normal  
rendering." it becomes a WHATWG issue to elicit a way to satisfy both  
"should" requirements at the same time if implementors don't  
otherwise have sufficient guidance on how to implement closed  
captioning support for Ogg interoperably.

Henri Sivonen
hsivonen at iki.fi

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