CR: TTML Profiles for Internet Media Subtitles and Captions 1.1

TTML Profiles for Internet Media Subtitles and Captions 1.1

https://www.w3.org/TR/2018/CR-ttml-imsc1.1-20180726/

feedback due by: 2018-08-23

Abstract


This specification defines two profiles of [ttml2-20180628]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats.

This specification improves on [ttml-imsc1.0.1] by supporting contemporary practices, while retaining compatibility with [ttml-imsc1.0.1] documents. Relative to [ttml-imsc1.0.1], any addition or deprecation of features are summarized at Appendix L. Summary of substantive changes (non-normative).

It is feasible to create documents that simultaneously conform to both [ttml10-sdp-us] and the text-only profile.

The specification defines extensions to [ttml2-20180628], as well as incorporates extensions specified in [SMPTE2052-1] and [EBU-TT-D].

Both profiles are based on [SUBM].

Status of the Document


This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at https://www.w3.org/TR/.

This document was published by the Timed Text Working Group as a Candidate Recommendation. This document is intended to become a W3C Recommendation. Comments regarding this document are welcome. Please send them to public-tt@w3.org (subscribe, archives) with [imsc1.1] at the start of your email's subject. W3C publishes a Candidate Recommendation to indicate that the document is believed to be stable and to encourage implementation by the developer community. This Candidate Recommendation is expected to advance to Proposed Recommendation no earlier than 06 September 2018.

Please see the Working Group's implementation report.

The deadline for comments is 23 August 2018.

For this specification to exit the CR stage, at least 2 independent implementations of every feature defined in this specification but not already present in either [ttml2-20180628] or [ttml-imsc1.0.1] need to be documented in the implementation report. The Working Group does not require that implementations are publicly available but encourages them to be so.

The Working Group has identified the following features "at risk", indicating that one or more may become prohibited prior to advancement to Proposed Recommendation, based on implementation experience: #lineShear #length-root-container-relative #shear

A list of the substantive changes applied since the initial Working Draft is found at substantive-changes-summary.txt. For convenience, a diff is offered at the W3C HTML Diff service.

Publication as a Candidate Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

This document was produced by a group operating under the W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

This document is governed by the 1 February 2018 W3C Process Document.