- From: Nigel Megitt <nigel.megitt@bbc.co.uk>
- Date: Thu, 22 May 2014 15:07:47 +0000
- To: Timed Text Working Group <public-tt@w3.org>
- Message-ID: <CFA3D15A.1E285%nigel.megitt@bbc.co.uk>
Available at: http://www.w3.org/2014/05/22-tt-minutes.html
[1]W3C
[1] http://www.w3.org/
- DRAFT -
Timed Text Working Group Teleconference
22 May 2014
See also: [2]IRC log
[2] http://www.w3.org/2014/05/22-tt-irc
Attendees
Present
pal, nigel, mike, jdsmith, frans
Regrets
glenn
Chair
nigel
Scribe
nigel
Contents
* [3]Topics
1. [4]MPEG liaison re MIME Codecs parameter
2. [5]F2F Planning
3. [6]Profile updates this week
4. [7]Issues discussed and raised over the past week
(selected subset)
* [8]Summary of Action Items
__________________________________________________________
<trackbot> Date: 22 May 2014
<scribe> scribeNick: nigel
MPEG liaison re MIME Codecs parameter
nigel: The thread has been quite hard to follow
mike: Everything that's in MPEG related to TTML came from the
CFF work. It would be helpful to go through what we did and
wanted to achieve, to clarify the current state.
... Maybe if Dave and/or Cyril can join us they can capture
what the MPEG request is.
nigel: I managed to add to issue-305 the topic areas and Mike's
sense of priority/ordering on them but still need to tease
requirements out if I can.
mike: It'll be tough because lots of it stems from DECE work
that ended up in MPEG and that's not on the thread at all.
... Maybe I should start drafting something and then nigel and
I can see if we have everything that we know of covered, as a
good starting point.
... Some of the reasons I've been remembering are the inability
to represent strict subsets of TTML features - you're forced
into extension namespace which then implies lack of
compatibility with TTML features
... which there's no way to do today. That's an open issue with
the profile mechanism.
... These gaps/errors in the profile mechanism as currently
defined lead to the current MPEG solution.
pal: I'd encourage the two of you to get together so that the
effort to capture the requirement does capture the background.
mike: For example tts:colour - it's an unresolved issue that a
strict subset of the TTML feature can not be defined.
pal: We discussed this in Shenzhen but not sure if there's a
resolution.
nigel: So to summarise there's no way to define a feature as a
strict subset of another feature.
mike: Without going to incredibly fine grained feature
definitions this can't be done.
... There should be an action item if there isn't one to go
through all the features and check that they match the prose in
TTML.
nigel: That's related to the work needed to define tests, if we
continue with the original approach.
<scribe> ACTION: mike Describe the history for how we got to
the signalling needed for MPEG that came from DECE for
ISSUE-305. [recorded in
[9]http://www.w3.org/2014/05/22-tt-minutes.html#action01]
<trackbot> Created ACTION-290 - Describe the history for how we
got to the signalling needed for mpeg that came from dece for
issue-305. [on Mike Dolan - due 2014-05-29].
action-290: Nigel to add any requirements from other places.
<trackbot> Notes added to action-290 Describe the history for
how we got to the signalling needed for mpeg that came from
dece for issue-305..
<scribe> ACTION: nigel Find the related issue that describes
the need to restrict or extend individual profile features
[recorded in
[10]http://www.w3.org/2014/05/22-tt-minutes.html#action02]
<trackbot> Created ACTION-291 - Find the related issue that
describes the need to restrict or extend individual profile
features [on Nigel Megitt - due 2014-05-29].
F2F Planning
action-289?
<trackbot> action-289 -- Nigel Megitt to Create a wiki page for
the september f2f with a draft agenda and an 'intention to
attend' section. -- due 2014-05-22 -- PENDINGREVIEW
<trackbot>
[11]http://www.w3.org/AudioVideo/TT/tracker/actions/289
[11] http://www.w3.org/AudioVideo/TT/tracker/actions/289
nigel: I've created the wiki page at
[12]https://www.w3.org/wiki/TimedText/geneva2014
... Describes agenda as listed on web page.
[12] https://www.w3.org/wiki/TimedText/geneva2014
mike: Day 2 conflicts with the SMPTE meetings - it would be
helpful to schedule breakouts on day 2 30 days out so that mike
and pal (at least) can work out their optimal attendance.
... I can come back to you with the SMPTE meeting details for
17th about a month before so that we can schedule this.
close action-289
<trackbot> Closed action-289.
Profile updates this week
nigel: This really needs Glenn but there's one small part I
think we can cover.
... This is the default for @validationAction which is
currently "abort" and mandatory.
... Proposal is to make it "warn" so that processors can
attempt to display document by default, and also to make it a
recommendation to the processor rather than mandatory.
pal: Does this fully capture Glenn's take on TTML2 or is there
further work required? We can wait until he's on a call before
answering this.
... I need to review the rest of this work before coming to a
conclusion on this.
mike: We need Glenn for this.
nigel: Okay we'll defer this proposal until we can bring Glenn
in.
Issues discussed and raised over the past week (selected subset)
issue-309?
<trackbot> issue-309 -- Image profile needs to permit text
equivalent -- raised
<trackbot>
[13]http://www.w3.org/AudioVideo/TT/tracker/issues/309
[13] http://www.w3.org/AudioVideo/TT/tracker/issues/309
pal: We can add a recommendation that when images are
distributed then text should also be distributed as a separate
version of the document alongside if the requirement for text
exists.
... It's not required for all applications. The specification
does not prevent that.
nigel: I'd need to see the explanatory text on this.
mike: If there is a requirement, then I'm okay with adding the
ability to add text to the image profile.
... We need to see the good reason or requirement for this
though.
pal: I'll add a note as a first step a paragraph explaining how
the requirements to accompany images with text can be
accomplished by including an image profile and a text profile
alongside the same media object.
mike: I don't think that's the requirement. This has a long
history and there are some unusual agendas at play.
issue-310?
<trackbot> issue-310 -- Forward reference rule doesn't take
into account child elements -- raised
<trackbot>
[14]http://www.w3.org/AudioVideo/TT/tracker/issues/310
[14] http://www.w3.org/AudioVideo/TT/tracker/issues/310
pal: The idea here is that just using a SAX parser you can
render the document as you get a call back for every single
node, without waiting until the entire document has been parsed
prior to rendering.
... I'll have a go at rewording to express this section better.
issue-312?
<trackbot> issue-312 -- forcedDisplay attribute is metadata so
should be in ttm not tts namespace -- raised
<trackbot>
[15]http://www.w3.org/AudioVideo/TT/tracker/issues/312
[15] http://www.w3.org/AudioVideo/TT/tracker/issues/312
open issue-312
nigel: This needs some wording that describes what the
processor needs to do.
Summary of Action Items
[NEW] ACTION: mike Describe the history for how we got to the
signalling needed for MPEG that came from DECE for ISSUE-305.
[recorded in
[16]http://www.w3.org/2014/05/22-tt-minutes.html#action01]
[NEW] ACTION: nigel Find the related issue that describes the
need to restrict or extend individual profile features
[recorded in
[17]http://www.w3.org/2014/05/22-tt-minutes.html#action02]
[End of minutes]
__________________________________________________________
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__________________________________________________________
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Received on Thursday, 22 May 2014 15:08:18 UTC