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Re: TTML Agenda for 15/05/13 - Proposed updates to charter

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Fri, 17 May 2013 11:07:15 +1000
Message-ID: <CAHp8n2muuceNNrUs_k6nuxuB6OhUGu7LjEeSc4Ms+cMxsRmiTw@mail.gmail.com>
To: Michael Jordan <mijordan@adobe.com>
Cc: "public-tt@w3.org" <public-tt@w3.org>
I'd like to reply to the idea of having an "common object model" for
translating cues between formats.

I think that is an effort that is bound to result in yet another
format specification rather than in something that is actually
practically useful.

I'd like to put that on the background that I've worked on creating an
abstract model for what captions are before. I've analysed typical
caption features and put that together on a Web page:
http://www.w3.org/community/texttracks/wiki/Caption_Model .

But you will notice that by doing so, I had to follow existing ideas
of how captions are rendered. In particular, I closely followed the
CEA708 model.

The next step would be to specify these ideas in an object model
diagram of sorts. But what use would such a object model be?

Think about a sw developer who has a TTML file and wants to translate
it to a WebVTT file to be rendered in a Web browser that only supports
WebVTT. What does he gain by having a "common object model"? IMHO:
nothing. It will not help him make that translation, because the
specifics of TTML and WebVTT are different from the specifics of the
object model. Thus, we have just increased the complexity of his task
from two to three formats and solved nothing.

In fact, wasn't the idea of TTML exactly that: creating a language in
XML that would be able to translate all other caption formats that
existed previously and would exist afterwards?

I therefore plead to you: let's not waste any more time on an abstract
task such as creating a "common object model" and instead do something
that is actually useful to a developer.

Best Regards,

On Fri, May 17, 2013 at 5:53 AM, Michael Jordan <mijordan@adobe.com> wrote:
> Some notes regarding proposed updates to charter :
> http://www.w3.org/2013/05/timed-text-charter.html
> In the mission statement, the phrase "based on implementation experience and
> interoperability
> feedback" is too detailed to include in the mission and gets into the "how."
> Under Scope :
> Change wording of "Such formats MUST be useable for online media captioning,
> described video (aka video/audio description) and
> should address the media accessibility user requirements." to "Such formats
> MUST support requirements for online media captioning, described video (aka
> video/audio description) and must address the media accessibility user
> requirements."
> When does "broadcast production" end? The term is used vaguely here.
> " Publish a Recommendation for a new Timed Text Markup Language (TTML) 1.1
> specification to include the Note described above." What is the note
> referenced in this sentence?
> "The Group is expected to produce annual updates for the Recommendation with
> previously specified but now
> newly supported features by browser vendors." This should be a separate
> deliverable, "Annual recommendation updates…"
> "Establish a semantic mapping between TTML and WebVTT in order to facilitate
> browser implementation and market adoption." Per our discussion on this
> morning's call, the idea of a direct semantic mapping between TTML and
> WebVTT may not be as desirable as a mapping of both semantic structures to a
> common object model, which can be used to translate cues from either source
> to HTML5 and CSS.
> Should wrapping up the TTML 1.0 Second Edition come before the new TTML 1.1
> specification in the scope list?
> Under Liaisons with W3C Groups. Should we liaise with the group working on
> Encrypted Media Extensions or is that be covered under our HTML Working
> Group dependency?
> Should browser vendors be included under External Groups?
> On 5/15/13 1:03 PM, "Sean Hayes" <Sean.Hayes@microsoft.com> wrote:
> our teleconference is scheduled with reference to Boston Time, the correct
> time of this teleconference in your locale may change. Please check
> http://timeanddate.com/worldclock/fixedtime.html?month=05&day=15&year=2013&hour=10&min=0&sec=0&p1=43
> Thursdays 10:00am-11:00am Boston local
> Zakim Bridge +1.617.761.6200, conference 8865 ("TTML")
> IRC: server: irc.w3.org, port: 6665, channel: #tt Web gateway to
> :http://www.w3.org/2001/01/cgi-irc
> Chair: Sean Hayes
> Agenda+ Assign Scribe
> Agenda+ Proposed updates to charter :
> http://www.w3.org/2013/05/timed-text-charter.html
> Agenda+ Progress on publication of SE
> Agenda+ HTML5 mapping (now as change proposal [1])
> Agenda+ Approval of 1.1 Change proposals [2] and [3].
> Tracker (Issues and Actions): http://www.w3.org/AudioVideo/TT/tracker
> Profile draft:  http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10-sdp-us
> Change proposals:
> [1] http://www.w3.org/wiki/TTML/changeProposal005
> [2] http://www.w3.org/wiki/TTML/changeProposal001
> [2] http://www.w3.org/wiki/TTML/changeProposal002
> TTML Wiki
> http://www.w3.org/wiki/TimedText
> Second edition draft:
> https://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10/spec/ttaf1-dfxp.html?content-type=text/html%3bcharset=utf-8
Received on Friday, 17 May 2013 01:08:03 UTC

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