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Power consumption is a major issue for handheld devices like mobile phones that decode and display multimedia streams through networks. Their power consumption during video playback directly depends on (1) network communications required to access video streams (2) video decoding process which complexity increases according to video characteristics (codec and video dimension). This paper describes a novel system approach to reduce power consumption through video resizing. This transformation implemented on an external device (i.e. a home gateway that transport video streams from the Internet to the embedded devices) reduces the computation complexity on the handled device up to 70% and reduce its amount of network communications up to 50%.