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TTWG's response to your comments about IMSC 1.0.1

From: Thierry MICHEL <tmichel@w3.org>
Date: Thu, 15 Jun 2017 17:14:21 +0200
To: takeuchi.s-js@nhk.or.jp, W3C Public TTWG <public-tt@w3.org>
Message-ID: <17f88fe8-2e18-f7cc-5a13-1bf56be043f9@w3.org>
Dear Shinya Takeuchi,
ARIB, W3C Timed Text Liaison contact

The Timed Text Working Group has reviewed the comments you sent [a] on 
the Wide Review Working Draft [b] of IMSC 1.0.1 published on 22 March 2017.
Thank you for having taken the time to review the document and to send 
us comments.

The Working Group's response to your comments is included below.

Please review it carefully and let us know by email at
public-tt@w3.org?subject=%5Bimsc%5D if you agree with it or not before 
30 June 2017 as we plan a Candidate Recommendation soon.

In case of disagreement, you are requested to provide a specific 
solution for or a path to a consensus with the Working Group. If such a 
consensus cannot be achieved, you will be given the opportunity to raise 
a formal objection which will then be reviewed by the Director during 
the transition of this document to the next stage in the W3C 
Recommendation Track.


For the Timed Text Working Group,
Thierry Michel
W3C Staff Contact

a. https://lists.w3.org/Archives/Public/public-tt/2017May/0018.html
b. https://www.w3.org/TR/2017/WD-ttml-imsc1.0.1-20170322/


Working Group's response to your comments

A-  Your comment on activeArea attribute

The WG clarified that specific behavior of the system is left
intentionally undefined (see latest Editor's Draft at [1]):

Under normal circumstances, the entirety of the root container is
presented. However, under special circumstances, such as when the
related video object is cropped, a system can, for instance, use the
ittp:activeArea parameter to avoid cropping areas of the root
container that are intended to be visible to the viewer. The specific
behavior of the system is however left undefined intentionally: the
system can select a presentation mode appropriate to the display
shape, user preferences, etc. The ittp:activeArea is analogous to the
Active Format Description (AFD) metadata commonly used in broadcast

A more detailed discussion is available at [2] and [3].

[1] http://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html
[2] https://github.com/w3c/imsc/issues/227
[3] https://github.com/w3c/imsc/issues/191

B- Your comment on fillLineGap attribute

The WG has revised Figure 1 (see [1]) to better illustrate the line
gap filling algorithm, which "extends the background of each inline
area generated by descendant <span>s of the <p> element to the
before-edge and after-edge of its containing line area."

See also the discussion at [2].

[1] http://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html
[2] https://github.com/w3c/imsc/issues/228

Received on Thursday, 15 June 2017 15:14:40 UTC

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