- From: Glenn Adams <glenn@skynav.com>
- Date: Sat, 23 Dec 2017 12:30:49 -0700
- To: Pierre-Anthony Lemieux <pal@sandflow.com>
- Cc: TTWG <public-tt@w3.org>
- Message-ID: <CACQ=j+fYq48KoN5Wu-3riJtiT_bJpiRQiDxTbS4xpwAcETjFeg@mail.gmail.com>
On Sat, Dec 23, 2017 at 12:26 AM, Pierre-Anthony Lemieux <pal@sandflow.com> wrote: > Hi all, > > The discussion at [1] on the implicit duration of singleton spans has > prompted me to review the TTML1 and IMSC1 tests. > > [1] https://github.com/w3c/ttml1/issues/193 > > I am wondering if MediaSeqTiming002.xml might have incorrect guidance. > As described at [2], it implies that "default duration for elements in > [a seq container] is 0" and that the following should not be rendered: > > <div timeContainer="seq" dur="20s"> > ... > <p begin="00:00:05:00">This text must not appear.</p> > ... > </div> > > Is that correct? Isn't the implicit duration of the <p> indefinite > since its anonymous span has an indefinite duration per TTML1? > The relevant spec text is in 10.4: The implicit duration of an anonymous span is defined as follows: if the > anonymous span's parent time container is a parallel time container, then > the implicit duration is equivalent to the indefinite duration value as > defined by [SMIL 2.1] <https://w3c.github.io/ttml1/index.html#smil21>; if > the anonymous span's parent time container is a sequential time container, > then the implicit duration is equivalent to zero. which handles the cases of the parent being a par or a seq distinctly. > Best, > > -- Pierre > > [2] https://github.com/w3c/ttml1/issues/303 > >
Received on Saturday, 23 December 2017 19:31:42 UTC