[Webkit-unassigned] [Bug 110479] [Meta] Implement support for TTML

Mon Feb 25 16:05:24 PST 2013

https://bugs.webkit.org/show_bug.cgi?id=110479

Pierre Lemieux <pal at sandflow.com> changed:

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                 CC|                            |pal at sandflow.com

--- Comment #26 from Pierre Lemieux <pal at sandflow.com>  2013-02-25 16:07:47 PST ---
(In reply to comment #24)
> (In reply to comment #23)
> > (In reply to comment #21)
> > > TTML's spec says: "It is intended to be used for the purpose of transcoding or exchanging timed text information among legacy distribution content formats presently in use for subtitling and captioning functions."
> > 
> > Just so there's no misunderstanding, TTML as published is definitely intended to be used as a distribution format. Indeed, it was previously named DFXP (Distribution Format Exchange Profile) to distinguish it from a more ambitious, but never fully specified AFXP (Authoring Format Exchange Profile).
> 
> 
> I have no issues with this statement. TTML was built with two aims:
> * as a distribution format ("distribution" in contrast to "rendering")
> * with a focus on captioning and subtitling
> 
> That's all I wanted to point out.

As pointed out earlier, there are many TTML-based applications worldwide, including EBU-TT [1], SMPTE-TT [2], SDP-US [3] and CFF-TT [4]. These applications do not preclude the distribution of TTML documents to client devices for rendering and, in fact, include the use case.

Why then introduce friction for TTML authors and end-users by actively discouraging the implementation of TTML rendering in WebKit, which is used in client devices?

[1] http://tech.ebu.ch/docs/tech/tech3350.pdf?vers=1.0
[2] https://www.smpte.org/sites/default/files/st2052-1-2010.pdf
[3] http://www.w3.org/TR/ttml10-sdp-us/
[4] http://www.uvvu.com/techspec-archive.php

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