- From: John Kemp <john@jkemp.net>
- Date: Wed, 15 May 2013 15:57:13 -0400
- To: "John Foliot" <john@foliot.ca>
- Cc: "'David Singer'" <singer@apple.com>, "'Loretta Guarino Reid'" <lorettaguarino@google.com>, <public-texttracks@w3.org>
>> David, I would >> hope we would also be ensuring that SMPTE-TT would also be "convertible" >> within the same mapping effort. SMPTE-TT is a profile of W3C TTML (https://www.smpte.org/sites/default/files/st2052-1-2010.pdf). One of its main uses is to allow the "tunneling" of broadcast TV closed captions (CEA 608) as binary data, base64-encoded in the TTML, a sort of compatibility or translation mode. Is the intent either to allow others (like SMPTE) to profile VTT (in the same way that SMPTE profiled TTML), or to define this kind of compatibility mode in VTT? Regards, JohnK On May 15, 2013, at 3:43 PM, John Foliot wrote: > David Singer wrote: >> On May 15, 2013, at 12:29 , Loretta Guarino Reid >> <lorettaguarino@google.com> wrote: >> >>> I'm not entirely sure what this means, but "using TTML as a source >> format for WebVTT" sounds scary. >> >> maybe badly expressed by me. One ought to be able to convert TTML to >> VTT. We've had a long-standing action to define how that's done. TTML >> is an authoring/exchange format by design, so it ought to be possible >> and needs defining. > > +1 to David. > > Loretta TTML is essentially XML (Sean Hayes will correct me, but in > principle, ya, it is XML-ish), and so converting XML-marked content to > another "markup format" is a common occurrence already today. David, I would > hope we would also be ensuring that SMPTE-TT would also be "convertible" > within the same mapping effort. > > At this point I would also express positive support for working with the > Timed Text WG as proposed. > > JF > >
Received on Wednesday, 15 May 2013 19:57:03 UTC