Codecs standards &. perspectives: codes & standards technical - compression political - standard negotiation sociological - copyright protection artistic.

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Presentation transcript:

codecs standards &

perspectives: codes & standards technical - compression political - standard negotiation sociological - copyright protection artistic - production tools scientific - (object) models computer science - syntax & semantics futuristic - semantic multimedia web commercial - content & delivery

compression is the key to effective delivery

media uncompressedcompressed voice 8k samples/sec, 8 bits/sample64 kbps2-4 kbps slow motion video 10fps 176x120 8 bits5.07 Mbps8-16 kbps audio conference 8k samples/sec 8bits64 kbps kbps video conference 15 fps 352x240 8bits30.4 Mbps kbps audio (stereo) 44.1 k samples/s 16 bits1.5 Mbps128k-1.5Mbps video 15 fps 352x fps 8 bits 30.4 Mbp 384 kbps video (CDROM) 30 fps 352x240 8 bits60.8 Mbps1.5-4 Mbps video (broadcast) 30 fps 720x480 8 bits248.8 Mbps3-8 Mbps HDTV 59.9 fps 1280x720 8 bits 1.3 Gbps 20 Mbps

 XML -- eXtensible Markup Language (SGML)  MPEG4 -- coding audio-visual information  SMIL -- Synchronized Multimedia Integration Language  RM5D -- (Web3D) Rich Media 3D (extensions of X3D/VRML) standards

 media objects -- units of aural, visual or audiovisual content  composition -- to create compound media objects (audiovisual scene)  transport -- multiplex and synchronize data associated with media objects  interaction -- feedback from users' interaction with audiovisual scene media objects Principles of Object-Oriented Software Development A. Eliens 2nd edn, 2000

agents everywhere

 gather information  filter and select information agent  access information  find suitable mode of presentation presentation agent

syntax & semantics

functional extensibility scripting, plugins, software SDK, clients servers

codes & standards: issues codecs -- efficiency authoring -- 3D, streaming media, audio functional extensibility -- interaction as choice points in computationally supported narratives

perspectives: codes & standards technical - codec selection political - market vs. consortium sociological - digital services artistic - Maya vd 3DSMAX scientific - experience design computer science - computational support futuristic - global & personal information commercial - WMV, Quicktime, RealONE

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