Timed Text Working Group Teleconference

29 Nov 2012

See also: IRC log


Frans, and, Andreas


<trackbot> Date: 29 November 2012

Chair Sean Hayes

IANA response

IANA response

<plh> http://lists.w3.org/Archives/Public/public-tt/2012Nov/0023.html

plh: Reply by Dec 15.
... charset parametre
... c/parameter
... RFC3023 and diff

<plh> "If supplied, the charset parameter must match the XML encoding declaration."

plh: Remove all references.

mike: Detailed reply by Mike.
... Talk about this sentence.


If supplied, the charset parameter must match the XML encoding declaration, or if absent, the actual encoding

scribe: Filed a new Issue-197 on TTML 1.0.
... If supplied, the charset parameter must match the XML encoding declaration, or if absent, the actual encoding.

plh: Check XML spec.

mike: Silent.

plh: UTF-8 or 16 or you have to have a XML declaration.

mike: Even if only UTF-8 or 16, you still have issues.

plh: What is actual encoding definition?

mike: TTML 1.0 is silent. XML 1.0 is unclear.

<plh> http://www.w3.org/TR/REC-xml/#charencoding

<plh> [[ parsed entities which are stored in an encoding other than UTF-8 or UTF-16 MUST begin with a text declaration (see 4.3.1 The Text Declaration) containing an encoding declaration ]]

glenn: Discusses what XML 1.0 says.

sean: TTML doesn't specify this. Is it premature to register a MIME type at this time.
... If we tackle all the issues for XML, we need to have a note on application of TTML using XML encoding.

glenn: Could have a TTML 1.0 SE appendix that defines a wire encoding.

[discuss optioins]


plh: ttml+xml

mike: We are left with the specification telling us to do something without a MIME type.

<plh> http://www.w3.org/TR/2010/REC-ttaf1-dfxp-20101118/#conformance-content

mike: People are using dxfp.

[Discuss what we do in testing.]

mike: Let lapse. We can start over.

sean: Lapse and get ducks in a row with a new note and then re-register.

glenn: Still wish to put an annex in SE.

sean: Complete by next week's call.

Action Glenn Create an Annex on using of XML wire encoding in TTML 1.0 SE.

<trackbot> Created ACTION-132 - Create an Annex on using of XML wire encoding in TTML 1.0 SE. [on Glenn Adams - due 2012-12-06].

plh: Respond to IANA we won't be ready by Dec 15.

mike: We have most of the bits to redo a submisson that is acceptable to IANA.

Resolution: Agreed to give Glenn 1 week to write an Annex. If this doesn't materialize, send email to IANA on the expiration of the request.

SDP-US Issues and Actions


<trackbot> ISSUE-182 -- Allow more than one profile to be used in the SDP-US. Add use of ttp:profile element. -- open

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/182

mmartin3: Added namespace. http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10-sdp-us/Overview.html#terms
... Can close.

Close Issue-182

<trackbot> ISSUE-182 Allow more than one profile to be used in the SDP-US. Add use of ttp:profile element. closed


<trackbot> ISSUE-190 -- Background vs Window Color -- pending review

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/190

mmartin3: Added example 2.
... Explanatory text.


glenn: Need colorization.
... copy into Visual Studio.

mike: On Issue-182, we don't address multiple profiles.

glenn: Strange to be different than TTML 1.0.

mmartin3: See also Conformance. [TTML10] allows zero or more profiles (ttp:profile in the head element) to be specified and used simultaneously. A presentation processor may reject documents it does not understand.

sean: Close on SE on Issue-183.

glenn: TTML 1.0 talks about semantically additive profiles.

sean: Algorithm exists.

glenn: Agreed.

sean: Have implemented TTML 1.0 and it gave me an answer using the algorithm.
... May need more text to describe.

mike: Agreed it should be in TTML 1.0.
... DXFP 1.0 + SDP-US profile is the issue.
... Deal with in TTML 1.0.

glenn: How does ttp:profile constrain processor or content.


<trackbot> ISSUE-190 -- Background vs Window Color -- pending review

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/190

Close Issue-190?

Close Issue-190

<trackbot> ISSUE-190 Background vs Window Color closed


<trackbot> ISSUE-188 -- Bounding SDP-US rendering complexity -- open

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/188

mmartin3: Descriptive text in annex.
... Section A.3 http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10-sdp-us/Overview.html#Section4

Text: Consideration may be given to defining a rendering model that accounts for drawing performance.

mike: Need to capture for future?

sean: Create an issue on v.next.

pal: Change target for deliverable for Issue-188.
... Add comment on why target was changed.


<trackbot> ISSUE-194 -- root container needs better definition -- open

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/194

mmartin3: Glenn added information in 7.4.2: http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10-sdp-us/Overview.html#constraints-8

mike: Why did you choose a note rather than a requirement?

glenn: Use SE terminology.

mike: Why not include in R0021 or R0022?

glenn: Clarification of what media object means in this context.

mike: OK with text.

Close Issue-194.

Close Issue-194

<trackbot> ISSUE-194 root container needs better definition closed


<trackbot> ISSUE-196 -- Constraining encoding to UTF-8 -- open

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/196

mmartin3: 2 reqts Section 10.1
...http: //dvcs.w3.org/hg/ttml/raw-file/tip/ttml10-sdp-us/Overview.html#Encoding_Constraints

A TTML document must be concretely represented as a well-formed [XML10] entity. A TTML document must be concretely represented using the UTF-8 character encoding [UNICODE].

glenn: Describes reqts.
... Add normative references.
... document representation in table

Close Issue-196

<trackbot> ISSUE-196 Constraining encoding to UTF-8 closed

glenn: Added prose before requirements.
... Content Authors must adhere to and Presentation processors must support the following constraints:....


<trackbot> ISSUE-189 -- do regions scroll their flowed content? -- open

<trackbot> http://www.w3.org/AudioVideo/TT/tracker/issues/189

mmartin3: Example SE, text SDP-US pointed to it.

Asked a question about displayAlign.

scribe: Defer to Glenn on his questions.

glenn: Didn't know where to add the example in SE.
... Discusses his concerns.
... Synchronic documents, no animation of the content.
... What is the need for this?

mike: Has alluded many experts how to simulate a scrolling region using synchronic timing is critical.

sean: This uses overflow to implement what looks like a roll-up.

glenn: For users' needs.
... Suggest an appendix to show applications of TTML.

sean: Put in new section after 1.2.

mike: Need to simulate where captions is an application.

Add empty section in SE as placeholder and point to it from SDP-US.

c/Add/Glenn: Add

sean: Put all examples in an annex?

glenn: Add empty subsection reference.
... Put in rough content in SE and then reference in SDP-US.

sean: We should close all issues and then agree to publish to Working Group Note.

pal: Read through document and then publish.

glenn: Editorial issues - need to do some formating and text cleanup.
... Rewrite Conformance and Error Handling

sean: Moratorium
... Publish as Last Call
... 2-4 week review

Resolution: To publish as Last Call this week with changes.

Final at New Year.

trackbot, end meeting

Summary of Action Items

[End of minutes]

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Regrets: Frans and Andreas
Found Date: 29 Nov 2012
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