MPEG_animation_timing

Contributors

  • ISO/IEC SC29 WG3 (MPEG Systems) - Scene Description Breakout Group
  • Contacts
    • Thomas Stockhammer (MPEG-I Scene Description BoG Chair, tsto@qti.qualcomm.com)

      Status

Based on ISO/IEC FDIS 23090-14

Dependencies

Written against the glTF 2.0 spec.

Overview

MPEG_animation_timing enables alignment between media timelines and animation timeline defined by glTF 2.0. Using the extension narrated stories could be created. The animation timing metadata could allow simultaneous pausing and other manipulation of animations defined in glTF 2.0 and media.

glTF extension to specify timing information that allow to synchronized animation with media

MPEG_animation_timing Properties

  Type Description Required
accessor integer Provides a reference to accessor ✓ Yes
extensions object JSON object with extension-specific objects. No
extras any Application-specific data. No

Additional properties are allowed.

MPEG_animation_timing.accessor

Provides a reference to accessor, by specifying the accessor’s index in accessors array, that describes the buffer where the animation timing data will be made available. The sample format shall be as defined in ISO/IEC 23090-14:7.6.3. The componentType of the referenced accessor shall be BYTE and the type shall be SCALAR.

  • Type: integer
  • Required: ✓ Yes
  • Minimum: ` >= 0`

MPEG_animation_timing.extensions

JSON object with extension-specific objects.

  • Type: object
  • Required: No
  • Type of each property: Extension

MPEG_animation_timing.extras

Application-specific data.

  • Type: any
  • Required: No

Interaction with other extensions

accessor pointed by MPEG_animation_timing.accessor shall contain MPEG_accessor_timed extension and point to a a glTF 2.0 buffer that contain MPEG_buffer_circular. The MPEG_buffer_circular extensions links to media that are provided by MPEG_media.

Known Implementations

Resources

  • ISO/IEC FDIS 23090-14, Information technology — Coded representation of immersive media — Part 14: Scene Description
  • ISO/IEC WD 23090-24, Information technology — Coded representation of immersive media — Part 24: Conformance and Reference Software for Scene Description for MPEG Media

License

Copyright ISO/IEC 2022

The use of the “MPEG scene description extensions” is subject to the license as accessible here: https://standards.iso.org/ and is subject to the IPR policy as accessible here: https://www.iso.org/iso-standards-and-patents.html.