Re: TTML and aspect ratio

On Mon, Jan 28, 2013 at 3:09 PM, Geoff Freed <geoff_freed@wgbh.org> wrote:

>
> Hi, everybody:
>
> One of NCAM's partners (Netflix) is looking for a way to specify aspect
> ratio in a TTML file; however, TTML currently has no way of actually
> specifying aspect ratio.  I took a look through the WG archives and saw
> that this topic has been discussed recently (
> http://lists.w3.org/Archives/Public/public-tt/2012Oct/0061.html) but it
> doesn't look like there has been any resolution.  Is this feature under
> consideration?
>
> (Netflix has raised the same issue with WebVTT, and it looks like that
> spec will be including metadata for specifying aspect ratio:
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=20566 .)
>

I'm not sure what you need, since TTML defines both ttp:pixelAspectRatio
[1] and tts:extent [2] on the root <tt> element.

G.

[1] http://www.w3.org/TR/ttaf1-dfxp/#parameter-attribute-pixelAspectRatio
[2] http://www.w3.org/TR/ttaf1-dfxp/#style-attribute-extent
[3] http://www.w3.org/TR/ttaf1-dfxp/#document-structure-vocabulary-tt