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

[bugzilla-daemon at webkit.org]

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

           Summary: [Meta] Implement support for TTML
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: glenn at skynav.com
                CC: eric.carlson at apple.com


The HTML5 track element permits reference to arbitrary types of caption, subtitle, and metadata resources. When making reference to a caption or subtitle resource, that resource may take the form of TTML (application/xml+ttml) [1] as well as WebVTT [2] and other caption/subtitle document formats.

Given that the U.S. Federal Communications Commission (FCC) has designated TTML (in the form of SMPTE-TT [3], a profile of TTML) as a safe harbor format for the delivery of captions over the Internet [4][5], it is expected that use of TTML (and its various profiles, such as SMPTE-TT and SDP-US [6]) will increase on the Internet and in the context of video media delivery over the Web. A number of significant providers of Web video content have already begun making use of TTML, including HBOGO [7] and Netflix.

This bug will serve as a meta bug for tracking other more specific bugs that provide an initial TTML implementation.

Note also that work is underway to publish a second edition of TTML 1.0 [8], and work has also begun on TTML 1.1 [9] which will add or change features in TTML.

[1] http://www.w3.org/TR/2010/REC-ttaf1-dfxp-20101118/
[2] http://dev.w3.org/html5/webvtt/
[3] https://www.smpte.org/sites/default/files/st2052-1-2010.pdf
[4] http://www.dwt.com/FCC-Adopts-Closed-Captioning-Rules-for-Online-Video-Programming-01-17-2012/
[5] http://www.broadbandlawadvisor.com/2011/07/articles/accessibility-persons-with-dis/accessibility-advisory-committee-releases-report-on-internet-closed-captioning-proposes-tiered-schedule-for-rule-compliance/
[6] http://www.w3.org/TR/2013/NOTE-ttml10-sdp-us-20130205/
[7] http://lists.w3.org/Archives/Public/public-tt/2012Jul/0007.html
[8] http://www.w3.org/TR/2013/WD-ttaf1-dfxp-20130131/
[9] https://dvcs.w3.org/hg/ttml/raw-file/default/ttml11/spec/ttml11.html

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