- From: David Singer <singer@apple.com>
- Date: Wed, 23 Sep 2015 15:49:42 -0700
- To: Nigel Megitt <nigel.megitt@bbc.co.uk>
- Cc: Timed Text Working Group <public-tt@w3.org>
> On Sep 23, 2015, at 4:10 , Nigel Megitt <nigel.megitt@bbc.co.uk> wrote: > > I disagree that the T2VP profile should be deliberately constrained to be > a subset of IMSC1, because it would be too limiting and wasn't specified > in the charter description of this Note. I’m with Nigel. Well, mostly. No, no, I support him. Let’s work out the best mapping, and then if the mapped part of TTML is not cleanly part of a current profile, think about how to handle that case. So I am sort of with both of you: I don’t want to constrain the mapping work a priori, but I also don’t want to emerge with a needless mismatch a posteriori. > > I do agree that if there are significant things that prevent IMSC 1 from > being mappable to WebVTT then we should look at the discrepancies and try > to reconcile them. I also would not object to an additional set of > constraints that explain what limitations would apply to WebVTT in order > to convert it to IMSC 1, extra to what could be done if mapping to TTML1 > more generally. > > Some obvious things that aren't in WebVTT but are constraints of IMSC 1 > that I do not think we need to carry over are the reference fonts, the > simultaneously active region limit and the HRM. Yup. > > Nigel > > > On 23/09/2015 05:51, "Timed Text Working Group Issue Tracker" > <sysbot+tracker@w3.org> wrote: > >> ISSUE-446: Should be a subset of IMSC1 [TTML WebVTT mapping note] >> >> http://www.w3.org/AudioVideo/TT/tracker/issues/446 >> >> Raised by: Pierre-Anthony Lemieux >> On product: TTML WebVTT mapping note >> >> The profile/authoring guidelines specified in the document should be a >> subset of IMSC1: >> >> - it helps narrow down the set of features to be supported, e.g. no need >> to support #markerMode >> - it simplifies the job of implementers who are already supporting IMSC1 >> >> Features have been deemed necessary but are not in IMSC1 should be >> considered for addition there. >> >> >> > > > > ----------------------------- > http://www.bbc.co.uk > This e-mail (and any attachments) is confidential and > may contain personal views which are not the views of the BBC unless specifically stated. > If you have received it in > error, please delete it from your system. > Do not use, copy or disclose the > information in any way nor act in reliance on it and notify the sender > immediately. > Please note that the BBC monitors e-mails > sent or received. > Further communication will signify your consent to > this. > ----------------------------- David Singer Manager, Software Standards, Apple Inc.
Received on Wednesday, 23 September 2015 22:50:11 UTC