ISO/IEC 14496-30:2018 PDF

Name: ISO/IEC 14496-30:2018 — Information technology — Coding of audio-visual objects — Part 30: Timed text and other visual overlays in ISO base media file format
SKU: ISO/IEC 14496-30:2018
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Information technology — Coding of audio-visual objects — Part 30: Timed text and other visual overlays in ISO base media file format

Название (английский):

ISO/IEC 14496-30:2018

Information technology — Coding of audio-visual objects — Part 30: Timed text and other visual overlays in ISO base media file format

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 7 ноября 2018 г.
Издание:: ISO/IEC IS 14496 edition 2 version 1
ICS:: 35.040.40

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Описание (английский):

This document describes the carriage of some forms of timed text and subtitle streams in files based on ISO/IEC 14496-12 (the ISO base media file format). The documentation of these forms does not preclude other definition of carriage of timed text or subtitles; see, for example, 3GPP Timed Text (3GPP TS 26.245), or the carriage of captioning information embedded in a media stream of another type (see Annex A).

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/IEC 14496-30:2018 defines how timed text (subtitles, captions and other visual overlays) is carried inside files based on the ISO base media file format (ISOBMFF) - the foundation of MP4 (ISO/IEC 14496-14) and Motion JPEG 2000 (ISO/IEC 15444-3). The standard specifies storage, layout and timing behaviour for timed text tracks so they can be used alongside audio/video, delivered by streaming servers (hint tracks), and integrated into MPEG‑4 systems.

Key topics and technical requirements

Scope: Carriage of specific timed text and subtitle stream forms in ISOBMFF files; does not preclude alternate carriage methods (e.g., 3GPP Timed Text).

Timed Text Formats: Formal support and mapping rules for TTML (Timed Text Markup Language) and WebVTT (Web Video Text Tracks), including sample entry and sample formats, codec parameters, and conversion (import/export) guidance.

Layout rules: How track width/height and the track_size_is_aspect_ratio flag determine sizing; use of track header matrix translation values (tx, ty) for positioning; stacking order via the layer field (equivalent to z-index).

Timing semantics: Delivery of text samples at sample decode time, rendering at composition time with sample duration; treatment of internal timing values embedded in payloads (start/end times, durations) and their relationship to sample composition intervals.

Track and sample definitions: Track format, sample format and sample entry specifications required for interoperability within ISOBMFF-based players and tools.

Resources & associations: Language handling, shared resources across samples, and rules for associating timed text tracks with visual tracks.

Annex A: Informative guidance on captioning embedded in other media stream types.

Applications and who uses it

ISO/IEC 14496-30:2018 is essential for:

Media player and device manufacturers implementing MP4 playback with native subtitle/caption support.

Streaming platforms and CDNs packaging subtitles in MP4 containers and using hint tracks for delivery.

Content creators and post‑production houses authoring TTML/WebVTT-based subtitles to be multiplexed into ISOBMFF files.

Standards engineers and codec implementers ensuring interoperability of timed text tracks across ecosystems. Practical uses include embedding subtitles/captions in MP4 files, synchronized text overlays for accessibility, and converting between external WebVTT files and in‑file timed text tracks.

ISO/IEC 14496-30:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO/IEC 14496-14:2003/Amd 1:2010

Information technology — Coding of audio-visual objects — Part 14: MP4 file format — Amendment 1: Handling of…

ISO/IEC 15444-3:2007/Amd 1:2010

Information technology — JPEG 2000 image coding system: Motion JPEG 2000 — Part 3: — Amendment 1: Additional…

ISO/IEC 14496-12:2015/Amd 2:2018

Information technology — Coding of audio-visual objects — Part 12: ISO base media file format — Amendment 2:…