The design of multimedia systems is becoming more and more challenging due to their growing complexity and strict performance requirements. New implementations fulfilling new market requirements must be included in increasingly complex multimedia systems. In this context, the OpenMAX standard provides abstraction facilities needed in order to design multimedia streaming applications with large amounts of data processing. This paper presents a methodology which provides a UML/MARTE methodology for the specification of multimedia systems according to the OpenMAX specification requirements for system level-design activities and a framework which automates the extraction of the corresponding SystemC executable specification, enabling the execution and the verification of the multimedia system.