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Re: [DRAFT] Call for Wide Review of TTML2 WD for @@ Group

From: Nigel Megitt <nigel.megitt@bbc.co.uk>
Date: Thu, 6 Jul 2017 16:00:34 +0000
To: Michael Dolan <mike@dolan.tv>, Thierry MICHEL <tmichel@w3.org>
CC: W3C Public TTWG <public-tt@w3.org>
Message-ID: <D5841CD4.43C40%nigel.megitt@bbc.co.uk>
Thanks Mike,

I found where we summarised the differences between TTML1 and TTML2: we
did it for the TAG review ­ the text we posted at

The TTML2 specification updates the TTML1 specification by adding
vocabulary and semantics to address more of its core requirements.

In summary it supports continuous animation of styling and positioning,
dereferencing and use of embedded or externally located resources such as
images, fonts, and audio, a more easily extensible metadata mechanism, the
ability to specify alternate initial values for styling, a more useful
profile mechanism, a conditional processing mechanism and a serialisation
format for resolved temporal subsections (intermediate synchronic
documents). The styling vocabulary has been increased to support advanced
text layout requirements such as Ruby, text emphasis, images, backgrounds,
shadows and in the next iteration we plan to support basic audio mixing by
specifying gain and pan.

At a functional level this means that TTML2 supports text layout
requirements for every script globally, is more fit for purpose in terms
of profiling and use by other downstream systems, supports audio (video)
description workflows and allows for more predictable rendering by means
of referencing specific fonts to use. Conditional processing, such as
semantic or transformation processing, based on parameters, media queries,
language selection etc are now also possible.

Several semantics defined non-normatively in TTML1 have been promoted to
being normative. All TTML1 documents are valid TTML2 documents; however,
TTML2 documents that specify @Version <https://github.com/version>2, may
not be valid TTML1 documents. Where there is feature overlap between
deprecated and new features, such as tts:origin and tts:position,
precedence rules are defined. Where appropriate references have been
updated, including normative references.

I'll tweak this and add it into Thierry's draft text in a moment.


On 06/07/2017, 16:33, "Michael Dolan" <mike@dolan.tv> wrote:

>Although [5] provides a very detailed list of changes, I think it would
>be helpful to many anticipated recipients of this communication to have a
>higher level summary of the additions/changes in the body of this email
>listed by topic, e.g.:
>Ruby Text
>3D Disparity
>Compositing with HDR video
>	Mike
>-----Original Message-----
>From: Thierry MICHEL [mailto:tmichel@w3.org]
>Sent: Thursday, July 6, 2017 7:01 AM
>To: Nigel Megitt <nigel.megitt@bbc.co.uk>
>Cc: W3C Public TTWG <public-tt@w3.org>
>Subject: Re: [DRAFT] Call for Wide Review of TTML2 WD for @@ Group
>resending with proper title TTML2
>Le 06/07/2017 à 11:54, Thierry MICHEL a écrit :
>> Dear @@@ Group,
>> The W3C Timed Text Working Group has recently published a new working
>> draft of the Timed Text Markup Language 2 (TTML2).
>> https://www.w3.org/TR/2017/WD-ttml2-20170630/
>> TTML2, provides a standardized representation of a particular subset
>> of textual information with which stylistic, layout, and timing
>> semantics are associated by an author or an authoring system for the
>> purpose of interchange and processing.
>> In addition to being used for interchange among legacy distribution
>> content formats, TTML Content may be used directly as a distribution
>> format, providing, for example, a standard content format to reference
>> from a <track> element in an HTML5 document, or a <text> or
>> <textstream> media element in a [SMIL 3.0] document.
>> The TTWG invites you to review this draft, and requests comments to be
>> received by 30 Sept 2017. These comments will be used to fulfil the
>> W3C Process [3] requirement for Wide Review of drafts, and  Horizontal
>> Review [4]  prior to publication as Candidate Recommendation.
>> If you wish to make comments regarding this document, please send them
>> to public-tt@w3.org <mailto:public-tt@w3.org with [ttml2] at the start
>> of your email's subject. All comments are welcome, however the scope
>> of review will be mainly focused on the new features introduced in
>> A cumulative summary of all changes applied to this version since the
>> current (TTML1, 2nd Edition) Recommendation was published is available
>> for your convinience [5].
>> [1] TTML2 latest version https://www.w3.org/TR/ttml2/ [2] TTML1
>> Recommendation https://www.w3.org/TR/ttml1/ [3] W3C Process
>> https://www.w3.org/2017/Process-20170301/
>> [4] Horizontal Review
>> https://www.w3.org/Guide/Charter.html#horizontal-review
>> [5] https://www.w3.org/TR/2017/WD-ttml2-20170630/ttml2-changes.html
>> Kind regards,
>> On behalf of Nigel Megitt, co-Chair, W3C Timed Text Working Group
>> Thierry Michel, Staff Contact for TTWG.
Received on Thursday, 6 July 2017 16:01:06 UTC

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