📄 （5）the delivery layer in mpeg-4.htm
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<P align=center>The Delivery Layer in MPEG-4</P></B></FONT><FONT size=2>
<P align=center>G. Franceschini - CSELT Centro Studi e Laboratori
Telecomunicazioni S.p.A</P>
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<P align=center>Abstract</P></B></FONT><FONT size=2>
<P align=justify>The MPEG-4 specifications have provided substantial progress in
many areas of multimedia technology. Following MPEG tradition, MPEG-4 focuses on
media coding. However, a couple of innovative aspects other than media coding
characterise MPEG-4 with respect to its predecessors: the ability to code an
audio-visual scene, and the ability to abstract from the delivery
technology.</P>
<P align=justify>This paper focuses its attention on this later aspect, which is
covered by part 6 of the MPEG-4 specification: DMIF (Delivery Multimedia
Integration Framework). The paper explains the motivations that have driven the
delivery technology abstraction, analyses the details of the DMIF architecture,
and highlights the practical impact on the "bits-on-the-wire" and on conformance
issues. It is important not to forget, throughout this paper, that the whole
focus of this work is on real-time delivery of multimedia content.</P>
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<LI>Introduction </B></FONT><FONT size=2>
<P align=justify>The MPEG-4 specifications have provided substantial progress
in many areas of multimedia technology. Following MPEG tradition, MPEG-4
focuses on media coding. However, a couple of innovative aspects other than
media coding characterise MPEG-4 with respect to its predecessors: the ability
to code an audio-visual scene, and the ability to abstract from the delivery
technology.</P>
<P align=justify>This paper focuses its attention on this later aspect, which
is covered by part 6 of the MPEG-4 specification: DMIF (Delivery Multimedia
Integration Framework) [6].</P>
<P align=justify>The main objective that motivated the DMIF effort has been
the definition of a separate delivery layer, so that the MPEG-4 Systems
specification does not enter the details of the various delivery technologies
(differently from MPEG-1 and MPEG-2). Moreover, DMIF aimed at enabling the
simultaneous access, presentation and synchronisation of MPEG-4 content
carried through different delivery technologies (here, and in the rest of the
paper, the term "delivery technology" is used in a broad sense, which includes
storage technologies). These requirements motivated the definition of the DMIF
reference architecture, including the definition of a uniform interface (the
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