FW: SMPTE Liaison to W3C re SMPTE-TT

 

 

From: Alan Lambshead [mailto:alan.lambshead@gmail.com] On Behalf Of Alan
Lambshead
Sent: Monday, June 02, 2014 8:03 PM
To: Michael A Dolan
Cc: plh@w3.org; liaisons@lists.smpte.org
Subject: SMPTE Liaison to W3C re SMPTE-TT

 

Dear Michael,

As previously reported in [1], SMPTE is developing standards for the
Interoperable Master Format (IMF). The first iteration of IMF (see SMPTE ST
2067-2) uses SMPTE ST 2052-1 (SMPTE-TT) for subtitle and captions delivery
across broadcast and Internet channels.

Based on user input and implementation feedback, the 35PM Technical
Committee of SMPTE, tasked with IMF, believes that:

- specifying a practical set of constraints against SMPTE-TT would improve
interoperability;

- it would be preferable if such constraints were based on an existing
profile of SMPTE-TT, leveraging existing implementations and content; and

- the IMSC profile of TTML, as embodied in the recently published FPWD [2],
is the lead candidate for such a practical set of constraints. In
particular, 35PM noted that IMSC is based on the CFF-TT profile, which is a
profile of SMPTE-TT and is already in use in the IMF user community.

SMPTE looks forward to the completion of the IMSC work, and working with
W3C.


[1] https://lists.w3.org/Archives/Member/w3c-archive/2012Sep/0214.html
[2] http://www.w3.org/blog/news/archives/3818

Sincerely,

 

Alan Lambshead

SMPTE Standards Vice President 

alambshead@smpte.org

Phone:+1 (416) 848-3119

 

CC: Philippe Le Hégaret (W3C) <mailto:plh@w3.org>  < <mailto:plh@w3.org>
plh@w3.org>

SMPTE liaisons <liaisons@lists.smpte.org>