Re: Re: TTML and aspect ratio

On Thu, Jan 31, 2013 at 7:52 AM, David Ronca <dronca@netflix.com> wrote:

> >btw, SDP-US goes beyond TTML and specifies requirements regarding the
> >relationship between the root container region and the related media
> >object, see R0016 and R0017 [1]
>
> There is a requirement that the root container must encompass the entire
> video window.  For a 16x9 video window, <ttpCellResolution="32,15"> would
> result in caption area that is stretched horizontally.
>

Not really. Keep in mind that the concept of cell in TTML does not
translate to anamorphic scaling. Rather, it is simply used as a grid for
resolving location expressions, such as used with tts:origin and tts:extent
on region elements.