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    • Home
    • ICS
    • Information Technology. Office Machines
    • Character Sets And Information Coding.
    • Coding Of Audio, Video, Multimedia And Hypermedia Information
    • ISO/IEC 14496-20:2008

    Codes & Standards - Purchase

    ISO/IEC 14496-20:2008

    Information technology -- Coding of audio-visual objects -- Part 20: Lightweight Application Scene Representation (LASeR) and Simple Aggregation Format (SAF)
    SKU: iso_052454_146186 Published by ISO/IEC Publication Year 2008 2 Edition 167 pages

    Product Details

    • Overview
    ISO/IEC 14496-20:2008 defines a scene description format (LASeR) and an aggregation format (SAF) respectively suitable for representing and delivering rich-media services to resource-constrained devices such as mobile phones.

    LASeR aims at fulfilling all the requirements of rich-media services at the scene description level. LASeR supports:

    • an optimized set of objects inherited from SVG to describe rich-media scenes,
    • a small set of key compatible extensions over SVG,
    • the ability to encode and transmit a LASeR stream and then reconstruct SVG content,
    • dynamic updating of the scene to achieve a reactive, smooth and continuous service,
    • simple yet efficient compression to improve delivery and parsing times, as well as storage size, one of the design goals being to allow both for a direct implementation of the SDL as documented, as well as for a decoder compliant with ISO/IEC 23001-1 to decode the LASeR bitstream,
    • an efficient interface with audio and visual streams with frame-accurate synchronization,
    • use of any font format, including the OpenType industry standard, and
    • easy conversion from other popular rich-media formats in order to leverage existing content and developer communities.

    Technology selection criteria for LASeR included compression efficiency, but also code and memory footprint and performance. Other aims included: scalability, adaptability to the user context, extensibility of the format, ability to define small profiles, feasibility of a J2ME implementation, error resilience and safety of implementations.

    SAF aims at fulfilling all the requirements of rich-media services at the interface between media/scene description and existing transport protocols:

    • simple aggregation of any type of stream,
    • signaling of MPEG and non-MPEG streams,
    • optimized packet headers for bandwidth-limited networks,
    • easy mapping to popular streaming formats,
    • cache management capability, and
    • extensibility.

    SAF has been designed to complement LASeR for simple, interactive services, bringing:

    • efficient and dynamic packaging to cope with high latency networks,
    • media interleaving, and
    • synchronization support with a very low overhead.

    ISO/IEC 14496-20:2008 defines the usage of SAF for LASeR content; however, LASeR can be used independently from SAF.

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