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Re: ISSUE-313 (Presented Region is informative only): Presented Region section is informative only [TTML IMSC 1.0]

From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Sun, 20 Jul 2014 15:03:36 -0700
Message-ID: <CAF_7JxCMHk+ts_7RxZKygKUtYkn5EDYocNhvTUmG2_xaVb1w2Q@mail.gmail.com>
To: Nigel Megitt <nigel.megitt@bbc.co.uk>
Cc: Timed Text Working Group <public-tt@w3.org>
Hi Nigel,

Please indicate whether the text at [1] resolves your comment per your
suggestion at [2].

[1] https://dvcs.w3.org/hg/ttml/raw-file/tip/ttml-ww-profiles/ttml-ww-profiles.html#presented-region
[2] http://www.w3.org/AudioVideo/TT/tracker/issues/313

Thanks,

-- Pierre

On Wed, May 21, 2014 at 6:03 AM, Timed Text Working Group Issue
Tracker <sysbot+tracker@w3.org> wrote:
> ISSUE-313 (Presented Region is informative only): Presented Region section is informative only [TTML IMSC 1.0]
>
> http://www.w3.org/AudioVideo/TT/tracker/issues/313
>
> Raised by: Nigel Megitt
> On product: TTML IMSC 1.0
>
> The definition of Presented Region [1] appears intended to add no information relative to what is in TTML1SE. I suggest making it informative rather than normative.
>
> However it does differ in that in TTML1SE temporally active regions with opacity=0 will be included in the intermediate synchronic document construction. Note that TTML1SE does not actually define "temporally active" directly as used in ยง9.3.2 Intermediate Synchronic Document Construction (though it may be implied by reference to SMIL semantics). Therefore another solution to this issue would therefore be to rephrase in terms of a localised definition of "temporally active" as applied to regions.
>
> For example:
>
> A region, as defined in [TTML1], is considered temporally active if all of the following conditions are true:
> ...
>
> Arguably this should be captured in an errata to TTML1SE and not needed in IMSC 1.0 at all.
>
> [1] http://www.w3.org/TR/ttml-imsc1/#presented-region
> [2] http://www.w3.org/TR/ttml1/#semantics-region-layout-step-1
>
>
>
Received on Sunday, 20 July 2014 22:04:24 UTC

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