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{minutes} TTWG Meeting 2017-07-20

From: Nigel Megitt <nigel.megitt@bbc.co.uk>
Date: Thu, 20 Jul 2017 14:41:44 +0000
To: TTWG <public-tt@w3.org>
Message-ID: <D5967E6E.449D5%nigel.megitt@bbc.co.uk>
Thanks all for attending today's TTWG meeting. Minutes can be found in HTML format at http://www.w3.org/2017/07/20-tt-minutes.html

We made one resolution:
RESOLUTION: Publish the png-hdr-pq document as a WG Note.

The review period for this resolution under our Decision Policy ends on 3rd August, however since this is a decision to publish a Note, which carries no implication of group consensus, and that there has been ample sign-posted review time, it is reasonable for the publication to occur before that date.

Minutes in text format:


   [1]W3C

      [1] http://www.w3.org/

                Timed Text Working Group Teleconference

20 Jul 2017

   See also: [2]IRC log

      [2] http://www.w3.org/2017/07/20-tt-irc

Attendees

   Present
          Nigel, Pierre, Andreas, Thierry

   Regrets
          Glenn

   Chair
          Nigel

   Scribe
          nigel

Contents

     * [3]Topics
         1. [4]This meeting
         2. [5]HDR in PNG
         3. [6]CSS styling equivalents of TTML2 and IMSC features
         4. [7]IMSC
         5. [8]TTML2
     * [9]Summary of Action Items
     * [10]Summary of Resolutions
     __________________________________________________________

   <scribe> scribe: nigel

This meeting

   Nigel: Today, we will look at the PQ in PNG Note, and the CSS
   features in TTML wiki page,
   ... which I need to be able to share with TAG tomorrow prior to
   meeting them next week,
   ... I don't think there's much to discuss for IMSC or TTML or
   WebVTT this week. AOB?

   Andreas: No other business from me.

HDR in PNG

   Nigel: We said we'd propose to publish this week. Any feedback
   received?

   Pierre: I've not received any further feedback.

   Nigel: I don't have anything to add on this.

   Andreas: Not from me either.

   PROPOSAL: Publish the png-hdr-pq document as a WG Note

   Nigel: I'm not sure about the practicalities of publishing
   this.

   Pierre: Can we use echidna?

   Nigel: I don't know!

   Pierre: I'm happy to follow up with Thierry.
   ... The Echidna tool says it can publish Notes with a group
   decision and a token.
   ... I should be able to request the token if it doesn't have
   one already and just do it.

   Nigel: Great.

   RESOLUTION: Publish the png-hdr-pq document as a WG Note.

   Nigel: I raised this as an issue on the repo:

   [11]Publish as a Note #5

     [11] https://github.com/w3c/png-hdr-pq/issues/5

CSS styling equivalents of TTML2 and IMSC features

   action-497?

   <trackbot> action-497 -- Nigel Megitt to Invite csswg to joint
   meeting at tpac 2017, with list of topics. -- due 2017-06-15 --
   OPEN

   <trackbot>
   [12]http://www.w3.org/AudioVideo/TT/tracker/actions/497

     [12] http://www.w3.org/AudioVideo/TT/tracker/actions/497

   Nigel: I've been in discussion with Alan Stearns about this -
   there has been a bit of early
   ... discussion of CSS WG feedback for TTML2 in the CSSWG
   reflector.
   ... I've also updated the CSS Requirements wiki page.

   [13]TTML and IMSC styling features that are hard to reproduce
   in CSS

     [13] https://www.w3.org/wiki/TTML/CSSRequirements

   Nigel: I think this is okay now but I don't know if anyone has
   any comments on it or suggestions
   ... for anything to change?

   Andreas: I haven't had the chance to review it.

   Nigel: I plan to share it by end of play tomorrow so any
   feedback really needs to come soon please.

   Pierre: David Baron went to some length previously.

   [14]David Baron email feedback 2016-11-23

     [14] https://lists.w3.org/Archives/Public/www-style/2016Nov/0106.html

   [15]Florian's email discussion thread to www-style 2017-07-14

     [15] https://lists.w3.org/Archives/Public/www-style/2017Jul/0007.html

   Pierre: It would be good to involve them in the discussion at
   least.

   Nigel: Yes, I assume David will be there at TAG next week but
   I'm not certain.
   ... It's a good point I should make sure his analysis is
   represented in the wiki page.
   ... I also noticed that there are some attributes like
   rubyOverhang and rubyOverhang class
   ... that are missing from Dae's list on imsc#218 so I pinged
   him there to ask but he hasn't
   ... yet replied.

   Pierre: Do you have textOutline on there too?

   Nigel: No, can that not be done with text-shadow?

   Pierre: No, it cannot be done in CSS except with one
   proprietary (Apple) extension.

   Nigel: OK I'll add that.
   ... Oh, rubyOffset seems missing too.

   Pierre: I think everything else you've already covered or it
   has good support already.

   Nigel: Oh I've just spotted inlineAreaBreak too, which is
   needed for linePadding - that's
   ... something that needs an extension relative to CSS, but I
   think that's already being
   ... discussed in CSSWG if I remember rightly.
   ... If there's anything else you see, especially in terms of
   accuracy of language, please let
   ... me know and/or edit the document to fix it.

   Pierre: I think the key step is to get agreement to include
   subtitles and captions in the core
   ... functionality of CSS, then the details can follow from
   there, with give and take as needed.

   Nigel: It's interesting to compare tts:displayAlign with CSS,
   and how it can be implemented.

   Pierre: It turns out that you need to use flex to meet the
   vertical positioning and I believe
   ... horizontal positioning too.
   ... Flex is the only way to preserve aspect ratio as well.
   ... To make TTML work reliably in my experience you must use
   flex.
   ... You may be able to do it with tables but that has other
   implications, like its not
   ... recommended - everyone says don't do it!

   Nigel: Okay I have some actions to tweak the document for now,
   as well as incorporating
   ... any review comments over the next 24 hours.

IMSC

   Pierre: I fixed the tests so line breaks are consistent and
   created two pull requests to
   ... do that and also to fix some broken renders.

TTML2

   Thierry: I had some responses for the wide review, but mainly
   "I'm submitting your liaison
   ... to the appropriate people". I should forward them to the
   member list to track them.

   Nigel: Yes please.

   Thierry: No substantial comments so far.

   Nigel: OK given that half of us have to disappear off for other
   things and we've covered
   ... as much of our agenda as we usefully can today, let's
   adjourn until next week. [adjourns meeting]

Summary of Action Items

Summary of Resolutions

    1. [16]Publish the png-hdr-pq document as a WG Note.

   [End of minutes]
     __________________________________________________________


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Received on Thursday, 20 July 2017 14:42:14 UTC

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