[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: MPEG-7 and XML
Dear Pavithran, MPEG-7 is a metadata standard to describe multimedia content. It allows to describe different aspect of a multimedia document ranging from structural ones (scenes, shots, transitions), descriptive (colors, histograms, level of noise), legal (author, date), aso... MPEG-21 provides necessary information to create a multimedia framework meaning tools to identify, publish, adapt and protect multimedia content. From a broader point of view MPEG is defining a "multimedia framework" where you can transmit video (MPEG2/MPEG4) or multimedia presentation (MPEG4), that can be searched (MPEG-7), identified and exchanged safely (MPEG-21). Used together these standards are complementary but they can be used of course independently. An MPEG-7 description can describe a JPG or a GIF file and even non digital content (tapes). MPEG-21 can be used to exchange any kind of multimedia content like a GIF file, an Mjpeg video or a smil presentation. In order to achieve this, MPEG is extensively using XML : - MPEG-4 : XMT-A : X3D based low level description of a multimedia content - MPEG-4 : XMT-O : SMIL based description of a multimedia content - MPEG-7 : multimedia content description - MPEG-21 : digital item description, terminal capabilities, aso.. In parallel to achieve efficiency MPEG defines many tools : a compact file format (MPEG-4 file format), a flexible network adaptation layer (MPEG-2 and MPEG-4 systems), and some streamable compression schemes for audio (AAC, MP3, ..), video and multimedia presentation (BIFS). Moreover, the past two years MPEG designed an XML binary encoding format called BiM. As its main features, BiM generates a very compact representation of an XML document. The resulting binary format includes information to considerably speed-up search (compiled). It is streamable which means that document deltas can be send to update a remote version of an XML document. It allows progressive download of an XML file in order to reduce user perceived waiting time for instance. It allows to update document at different refresh rates. Therefore, XML is influencing MPEG in many ways. Every XML language is designed using core XML specification (XML Schema, XPath). Even BiM relies on XML Schema specification. Moreover, MPEG is using many non-MPEG XML standard specifications (SMIL, X3D). Hope it answers your questions. Best regards, Claude. > Pavithran wrote: > > Hi All, > Can any one give real time usage of MPEG-7 and MPEG-21, > How XML is going to influence MPEG stds, > Thanking in advance, > Pavithran -- ______________________________________________ Claude Seyrat http://www.expway.fr EXPWAY 17, rue du Pont aux Choux 75003 Paris, France T: +33 1 44 54 29 28 M: +33 6 07 66 26 63 F: +33 1 44 54 90 49 E: claude.seyrat@e... www.expway.tv
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