GB/T 20090.11-2015Information technology—Advanced coding of audio and video—Part 11: Synchronous text (English PDF)

GB/T 20090.11-2015 is the English-translated version of 信息技术 先进音视频编码 第11部分：同步文本.

GB/T 20090.11-2015 is the synchronous text part of GB/T 20090 on the advanced coding of audio and video.

Clause 1 states that this part specifies the format of the text that terminal equipment renders in synchronization with audio and video media, called synchronous text, and that it applies to digital television broadcasting, digital storage media, Internet streaming media, multimedia communications and other applications.

The contents list an Introduction, clause 1 Scope, clause 2 Normative references, clause 3 Terms and definitions, clause 4 Abbreviations, clause 5 on text display properties and clause 6 on the synchronized text format.

Clause 5 runs through UTF-8 support, byte character, character set support, font support, color support, text display position, subtitles rolling, language, writing direction, text wrapping and, at 5.11, highlights, annotations and what the draft prints as Kara OK.

Clause 6 covers the conventions, the synchronized text sequence, the text sequence header format with its language, layer, timeinfo and position elements, the sample description set format with the sample description format, and the text sample format with its text, dur, SD_id and modifiers elements.

Clause 3 defines synchronized text as text that has a time attribute and is rendered in synchronization with audio or video, the synchronous text sequence as a sequence made up of a series of consecutive text samples, the sample as the basic unit that makes up a synchronized text sequence, and the sample description as a defined template of display properties for a text string, while clause 4 gives XML as its only abbreviation.

Clause 2 cites GB/T 1988-1998, GB 2312-1980, GB/T 4880.3-2009, GB 13000-2010, GB/T 18793-2002 and RFC 3629, and the body of the draft breaks off after clause 4.

The foreword records that GB/T 20090 is expected to run to thirteen parts, which it lists, that some of the content of the document may involve patents for which the issuing body assumes no identification responsibility, that the part is administered by SAC/TC28, and that it was drafted by Peking University, the Chinese Academy of Sciences Institute of Computing Technology and Beijing University of Posts and Telecommunications.

The page names no earlier edition of this part; it was issued on 10 December 2015 and has applied since 1 August 2016.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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