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7.6. Summary

This chapter has explored in detail the general approach and some specific mechanisms for the delivery of MPEG-4 presentations. First, the delivery layer abstraction of the DMIF was introduced, which specifies the interface functionalities that are required from any transport protocol for the delivery of MPEG-4 presentations. Two practical applications of the DMIF abstraction, or DMIF instances, were subsequently introduced: the specification of the transport of MPEG-4 presentations on MPEG-2 Systems and on IP. The characteristics of each of these delivery layer adaptations were highlighted. Furthermore, the delivery-related functionalities specified within the MPEG-4 Systems standard (namely, the FlexMux tool and the MPEG-4 file format) were introduced. The file format is another DMIF instance, yet a very special one, as it constitutes the generic exchange format for MPEG-4 presentations. MPEG-4 presentations can be adapted for delivery over many transport protocols as needed for future MPEG-4 applications.


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