ISO/IEC 23000-22:2025/Amd 1:2025

Overview

ISO/IEC 23000-22:2025/Amd 1:2025 is an important amendment to the international standard governing the Multimedia Application Format (MPEG-A) Part 22, also known as the Multi-Image Application Format (MIAF). This amendment focuses on implementation-based technologies that enhance the practical use and development of MIAF-compliant multimedia applications. Developed by the Joint Technical Committee ISO/IEC JTC 1 SC 29, the amendment aligns with current industry practices and facilitates consistent implementations worldwide.

This standard update supports the efficient handling, organization, and presentation of multi-image content for digital multimedia platforms. It incorporates improvements like support for tone-map derived images, clarified HDR signaling, and guidelines on sequence looping and image item ordering, reflecting real-world technology deployments.

Key Topics

• Tone-map Derived Images:
  Introduces a new concept of 'tone-map derived images' identified by the item_type value 'tmap'. These images derive from base images within MIAF files, ensuring consistency in image rotation and mirroring transformations.

• Alternative Image Grouping:
  Tone-map images must be contained within an alternative image group alongside a valid MIAF master image, facilitating flexible representation of image variations in a single container.

• HDR Signaling Correction:
  Updates subclause 8.8 to emphasize the importance of accurate HDR metadata signaling, crucial for correct display and rendering of high dynamic range images.

• Implementation Practices (Annex C):
  Documents real-world implementation decisions, improving interoperability among developers and manufacturers. It covers:

  • HEIF sequence looping behavior to standardize playback repetition modes.
  • Sorting rules for HEIF image items based on ItemInfoBox and item IDs.
  • Sort order handling of 'altr' groups, enabling grouped image alternatives to be treated logically within collections.

Applications

• Multimedia Content Distribution:
  Enhances packaging and delivery of multi-image content such as photo albums, image sequences, and adaptive image layers in streaming or download services.

• Digital Imaging Systems:
  Facilitates consistent presentation of images that require tone mapping, HDR display, or alternative image options in consumer electronics like cameras, smartphones, and displays.

• Web and Mobile Media Players:
  Supports advanced image sequencing and looping behavior to improve user experience for interactive and animated media content.

• Broadcast and OTT Services:
  Allows broadcasters and over-the-top (OTT) platforms to implement robust multi-image formats that maintain image quality and metadata signaling for HDR and other advanced features.

• Software Development:
  Guides developers in implementing MIAF-compliant applications that handle complex image presentations, ensuring compatibility and performance.

Related Standards

• ISO/IEC 23000 Series (MPEG-A):
  The parent series addressing multimedia application formats across various media types such as text, video, and images.

• ISO/IEC 14496-12:2022 (ISO Base Media File Format):
  Defines foundational file format structures used in MIAF and HEIF sequences including TrackHeaderBox and EditListBox relevant for sequence looping.

• High Efficiency Image File Format (HEIF):
  Closely associated with MIAF for storage and management of individual images and image sequences utilizing advanced compression and metadata.

• HDR Video and Imaging Standards:
  Standards covering High Dynamic Range content where signaling accuracy is critical, complementing the HDR-signaling updates in this amendment.

For multimedia professionals, developers, and manufacturers, ISO/IEC 23000-22:2025/Amd 1:2025 offers a critical update to the MIAF ecosystem, ensuring consistent implementation of advanced multi-image functionalities and boosting interoperability in multimedia applications worldwide. Utilize this standard to align your products and workflows with the latest international multimedia best practices.