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This paper presents an efficient reconfigurable entropy encoder for real time adaptation of multi-standard compressed video stream. The proposed embedded architecture is based on partial and dynamic reconfiguration. Static and dynamic wrappers are defined to encapsulate different types of entropy coders with efficient swapping capabilities for context saving and restoring. The wrappers are designed to reduce the area overhead. A partitioning of reconfigurable area is also presented aiming at the optimization of reconfiguration overhead. The obtained results show a significant gain up to 40% in silicon area compared to a solution without reconfiguration and a significant gain of 23% in reconfiguration time. Thanks to reconfigurable entropy coder, it is possible to treat MPEG-2 and H.264 video streams meeting its real time constraints using dynamic reconfiguration.