Meeting minutes
This meeting
Nigel: Today it looks like we have no DAPT agenda items
… There's one thing for the TTML Media Type and Profile Registry
… an update on interop for WebVTT
… TPAC planning - check the draft schedule
… I don't know of any update on AI technologies
… Any other business, or points to cover?
Pierre: Nothing from me on the agenda
Nigel: Thanks.
TPAC Planning
Nigel: There's a draft TPAC schedule. TTWG meets most of the day on the Thursday (29 Oct), after the MEIG + TTWG + APAWG joint meeting
… But that joint meeting is at the same time as AGWG, and ARIA WG. There might be an overlap of people
… Media WG meets on Friday, no overlap
… On Monday, MEIG is the first half, then there's a joint meeting after lunch. Audio WG meets all day Monday
… This means we meet Monday, then Thursday and Friday. If this doesn't work for anybody, this is the time to give feedback
Gary: I won't be there in person, which means I'll only be able to join remotely in the afternoon (in TPAC time)
Nigel: Andreas said he'd prefer to meet towards the end of the week, so it works out for him
Gary: Demuxed hasn't been announced yet, and there's a possibility it will overlap
Nigel: I'll ask Phil not to do that!
Nigel: I'm not hearing reasons to ask for changes
… I think they only want feedback if there are issues
Chris: Yes
Nigel: Anything else on TPAC?
(nothing)
TTML Media Type Definition and Profile Registry
Auto-publish status
Nigel: What's the status of this?
Atsushi: It will be working shortly
Nigel: Anything else on the Registry?
(nothing)
WebVTT
Interop update
Gary: We met last week and we're going to try to meet about every other week
… In the last meeting, the WPT group want scoring criteria to be able to show whether we're making progress or not
… The current rendering tests should cover about 75% of the score, with the other API and parsing tests being the other 25%
… Rendering is the big interop issue, and that exercises the entire stack, which is helpful
… The other thing, is to have people looking at the tests to see if anything is wrong, in their own time. Instead we'll spend meeting time on that, which should work better
… Having people be able to discuss in a meeting is helpful, especially where there subjectivity involved
Nigel: It's interesting that some things are subjective, does that point to things that need to be defined objectively in the spec, or is that by design?
Gary: Sometimes it's unclear what the tests are trying to do, until you look into them a bit more
Nigel: So you don't envisage changes to the spec?
Gary: This interop work is identifying the tests that are definitely failing. Are the tests wrong, are the browsers rendering incorrectly, or is the spec incorrect and needs to be updated?
Nigel: Are there notes?
Gary: Not really, last time only a few of us joined, myself, Dana, and Romain
Nigel: How do people find out about the meetings?
Gary: In GitHub, nothing more formal
<gkatsev_cloud> webvtt interop github
Nigel: Anything more on WebVTT, or other topics?
Meeting close
Nigel: Thanks everyone, we've completed our agenda, let's adjourn.
… See you in 2 weeks 2026-07-16
Agenda issue for 2026-07-16 meeting
Nigel: [adjourns meeting]