（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>
<P align=center>&nbsp;</P></FONT><FONT face=Helvetica><B>
<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>
<P align=justify>&nbsp;</P></FONT>
<OL><FONT size=2></FONT><FONT face=Helvetica><B>
  <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 
  DAI

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