<plh> trackbot, start telcon

<trackbot> Meeting: Timed Text Working Group Teleconference

<trackbot> Date: 07 March 2013

<plh> Chair: Monica J. Martin, Philippe Le Hegaret

<glenn> calling in now

<plh> Andreas: [lots of folks from EBU]

<plh> scribe: plh

Monica: we'll have a short meeting

<EBU> EBU Meeting: Matt Simpson (Red Bee Media), John Birch (Screen Subtitling), Frans de Jong (EBU), Nigel Megitt (BBC), Andreas Tai (IRT), Martin Schmalohr (IRT), Peter tho Pesch (IRT), Reinhard Möller (Zeitanker)

Glenn: I reviewed the text proposed by Mike, and will be able to add it this week
... and will get a new draft after

Monica: we had a lengthy with discussion followning the issue from Netflix

<glenn> have received proposed text from MD to add informative note in 1.0SE that suggests an interim approach to specifying (storage) aspect ratio

<glenn> i expect to add this text to the 1.0SE ED this week for further review by the group

Monica: the text hasn't come to the list yet
... this is related to issue-156, action item-148

<mmartin3> good morning

<glenn> Note:

<glenn> It can be beneficial to presentation processors to signal the authorial layout intentions for aspect ratio consistent with the semantics of CEA-708-D, section 4.5 “Caption Service Metadata”, “ASPECT RATIO”. This can be implemented with external namespace metadata, such as “m708:aspectRatio” as defined in SMPTE 2052-11, Section 5.4.4.

Glenn: the text is clearer on which aspect ratio is referred to
... might need to fine tune the text

Monica: we want to make it clear that the text is targetted to the presentation processor rather than the author

<glenn> i may need to alter this text to make clear this is storage aspect ratio (SAR), and not pixel aspect ratio (PAR) or display aspect ratio (DAR)

Monica: this is not normative text, just guidance
... due to constraint in SE

Philippe: so the changes would be more substantial in 1.1?

Glenn: correct, we'll have to introduce new vocabulary

<mmartin3> Issue-201

<trackbot> ISSUE-201 -- How to specify aspect ratio to understand positioning that may apply for display or video. -- open

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/201

Monica: and that's a small part of issue-201

Glenn: keep action-148 open for now

Monica: let's formalize this over the week

EBU issues

andreas: we published new updates around our TTML mappings

<nigelmegitt> EBU-TT part 1: http://tech.ebu.ch/docs/tech/tech3350.pdf

Andreas: what's the status on the TTML side?

Monica: thank you for joining us. we made quite a bit of progress.
... to advance SDP-US
... the Note is now posted in the W3C site

http://www.w3.org/TR/ttml10-sdp-us/

scribe: we worked with Andreas to facilitate the mapping on the EBU side
... Glenn, any issue we need to bring up?

Glenn: nope

<glenn> i'm open to answer any specific questions

Philippe: we can focus on the 1.0 SE and finish since SDP-US is behind now

Andreas: we're glad to continue participating

WebVTT

<inserted> scribe: mmartin3

plh: Finalize spec. May move to Recommendation.
... No timeline
... Apply to HTML5.

glenn: Is the worked focused on text track API or in WebVTT to support FCC captioning requirements for rollup, painton and popup.

plh: There is an extension to text track interface.

glenn: Use of JavaScript - how used with content stream? Injected, interact with external web page? Don't know how to inject JavaScript? Security issues may arise.

plh: Discuss relationship between WebVTT and TTML.

glenn: Bug filed to WebKit to add TTML support.
... WebKit developer opposed because of WebVTT.
... IE10 has support for TTML.
... Input to encourage other agents to support TTML directly.
... View authoring rather than distribution.
... Misunderstanding on how TTML uses XSL-FO to describe formatting semantics.
... XSL-FO processor is not required.
... Add SE section to describe format model that uses HTML5 and CSS. Second alternative description of TTML formatting semantics.
... Help encourage understanding of use of TTML.

plh: May be significant work.
... Publish as Working Group Note on the side.

glenn: Will send a proposal to the list.
... If we map TTML to text track objects, we need to explain how to translate HTML5.

plh: We have a Note identified in Charter.

mmartin3: Was going to say that.

glenn: Add informative Annex in SE.

plh: Formatting item may not be sufficient.

mjordan: IE has WebVTT support.
... Should we map to HTML5 or to WebVTT?

glenn: Effective to translate into WebVTT.
... Add native support for TTML in user agents.
... Support TTML movie house commitments.

mjordan: WebVTT is being rendered in HTML5 in DOM. Can we use a similar focus? Your proposal provides a translation which may be appropriate.

glenn: Synchronic Flow Processing in TTML 1.0.
... Map synchronic documents to XSL-FO. Do similar description to HTML5. CSS.

<plh> Monica: Sean has done some mapping already, will provide a link

<plh> ... IE supports both WebVTT and TTML

glenn: IE supports both WebVTT and TTML. TTWG has made significant progress.

<plh> Plh: nothing concrete at this time. if something comes up, I'll come back here
...andreas: Much discussion in our community.
... Will make proposals when our views are more concrete.
... Difficult to parse how to use XSL-FO.

<plh> ACTION: plh to update the Working Group page [recorded in http://www.w3.org/2013/03/07-tt-minutes.html#action01]

<trackbot> Created ACTION-150 - Update the Working Group page [on Philippe Le Hégaret - due 2013-03-14].

trackbot, end meeting

This is scribe.perl Revision: 1.137  of Date: 2012/09/20 20:19:01  
Check for newer version at http://dev.w3.org/cvsweb/~checkout~/2002/scribe/

Guessing input format: RRSAgent_Text_Format (score 1.00)

Succeeded: s/Andreas, Pierre/Pierre/
Succeeded: i/plh: Finalize spec/scribe: mmartin3
Found Scribe: plh
Inferring ScribeNick: plh
Found Scribe: mmartin3
Inferring ScribeNick: mmartin3
Scribes: plh, mmartin3
ScribeNicks: plh, mmartin3
Default Present: +49.893.aaaa, Plh, glenn, Andreas, Monica, Michael_Jordan
Present: +49.893.aaaa Plh glenn Andreas Monica Michael_Jordan
Regrets: Sean Michael_D Pierre Frans
Found Date: 07 Mar 2013
Guessing minutes URL: http://www.w3.org/2013/03/07-tt-minutes.html
People with action items: plh