Timed Text Working Group Teleconference

<scribe> scribe: nigel

This Meeting

nigel: Today we have some outgoing liaison text to finalise, which I'd like to timebox.
... Profiles Registry is for next week on request of Mike
... So then TTML2, and I am not aware of other topics to discuss. F2F is on the agenda,
... just in case there are any questions or agenda requests.
... AOB?

group: No AOB

F2F Planning

-> https://www.w3.org/wiki/TimedText/F2F-jan-2017

IMSC

nigel: Can we spend max 20 minutes on the liaison text?

-> https://lists.w3.org/Archives/Member/member-tt/2016Nov/0020.html

group: [discussion of liaison text]

nigel: Just to draw this to a close, is the generic template response ok with everyone?

glenn: Yes, okay with me, and could be used for DVB also as is.

nigel: Ok we have consensus on the generic template.

<scribe> ACTION: nigel Send generic liaison to ATSC, ARIB, MPEG (via Mike), DECE, CTA, DASH-IF, DTG, HbbTV, SMPTE. [recorded in http://www.w3.org/2016/11/17-tt-minutes.html#action01]

<trackbot> Created ACTION-487 - Send generic liaison to atsc, arib, mpeg (via mike), dece, cta, dash-if, dtg, hbbtv, smpte. [on Nigel Megitt - due 2016-11-24].

<scribe> ACTION: nigel Send liaison to DVB replacing first sentence from generic response with acknowledgement sentence. [recorded in http://www.w3.org/2016/11/17-tt-minutes.html#action02]

<trackbot> Created ACTION-488 - Send liaison to dvb replacing first sentence from generic response with acknowledgement sentence. [on Nigel Megitt - due 2016-11-24].

F2F

Pierre: Will there be a telecon facility at the F2F?

nigel: I can put one in if anyone asks - nobody has so far.

Pierre: We should have a draft at the face to face meeting so I will check if that would help.

IMSC

close action-484

<trackbot> Closed action-484.

nigel: Thank you for doing that drafting Pierre.

<tmichel> hum ... I lost you guys

Action-478?

<trackbot> Action-478 -- Nigel Megitt to Draft a liaison to hbbtv requesting further information and proposing an option e.g. to extend imsc 1 to allow signalling of background height on span, and request timelines etc. -- due 2016-09-26 -- OPEN

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/actions/478

nigel: The agreed liaison text in principle covers this action but maybe we should try to
... add a paragraph as previously discussed asking about background height on span. I will
... draft an additional paragraph and send for review.

TTML1 & TTML2 issues, actions, PRs, editorial actions etc

nigel: First thing to note is we have a new WD published with today's date on it.

<tmichel> I am back

-> https://www.w3.org/TR/2016/WD-ttml2-20161117/

tmichel: There was a bit of confusion about the new pub rules checker which is very strict,
... and does not let anything through that is not an exact match.

nigel: Thank you Thierry and Glenn for getting that out.

tmichel: Should I send this to the horizontal reviewers?

nigel: My view is send this now since there is no restriction asking us only to begin horizontal
... review at "last call" or equivalent.

tmichel: OK then I will send the prepared security questionnaire and the WD link to the
... other groups for horizontal review.

action-481?

<trackbot> action-481 -- Glenn Adams to Provide nigel with a list of new features in ttml2 to begin reviewing -- due 2016-09-26 -- OPEN

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/actions/481

nigel: I will kick on with this action to draft a short description as a small number of
... paragraphs of prose, and send to you Glenn for review. Thierry, if you CC me in on your
... emails to the horizontal review groups then I can respond with this descriptive text.

tmichel: Sure

nigel: Thank you
... We have two pull requests outstanding - is there any reason not to merge those?

glenn: I didn't have time to review and merge those before doing the WD, but will do so soon.

nigel: OK, thank you.
... Should we raise https://github.com/w3c/ttml1/issues/220 lineHeight "computed" inheritance?

glenn: A couple of implementations I reviewed consider the value "normal" to be considered
... a computed value for inheritance, and then calculate the actual line height further down the tree.
... That is consistent with the CSS behaviour.
... For percentages, they are resolved to an absolute value that is inherited. I have not checked
... the implementations of these.

<glenn> https://www.w3.org/TR/CSS22/visudet.html#propdef-line-height

pal: I think it's really important to note that the computed value of normal is "normal".
... Also not to change the algorithm in TTML for percentages. Whether we change the
... recommendation to authors about baseline jumping etc I do not have a strong opinion.

glenn: I agree with you on this Pierre. If we feel it is important we can add a note giving
... advice to authors. I am not sure I understand the baseline jumping business so I need to
... review the thread - I think that the baseline jumping issue may not be a correct interpretation of the text.

nigel: I've added a comment to the issue above.

glenn: Now that we have a new WD will we be sending out liaisons requesting review?

nigel: No, we should wait until we think we're at the "final" WD so that the wide review
... comments that we receive clearly apply to that version of the document.

glenn: We did say in Lisbon that we would issue a WD for wide review in early November.

nigel: Yes, and that was on the basis that it would be a "last call" style WD however since
... we are not ready for that but we want to initiate horizontal review we agreed last week
... to publish an interim WD.

glenn: I would like to spend some time next week discussing how we proceed to a WD for
... wide review.

nigel: Okay, good idea.
... We're out of time for today, thanks everyone [adjourns meeting]