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NEK ISO/IEC 14496-20:2008

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The electronic version of this International Standard can be downloaded from the ISO/IEC Information Technology Task Force (ITTF) web site.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, andeasy 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, andextensibility.SAF has been designed to complement LASeR for simple, interactive services, bringing:efficient and dynamic packaging to cope with high latency networks,media interleaving, andsynchronization 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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  • Standard fra NEK
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  • Utgave: 2.0
  • Versjon: 1
  • Varetype: NAT
  • Products.Specs.pages
  • ICS 35.040.40
  • National Committee ISO/IEC JTC 1/SC 29

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