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The emerging IEEE 802.15.4 standard is designed for low data rate, low power consumption and low cost Wireless Personal Area Networks (WPANs). Video transmission over such networks is considered an issue since video traffic demands high data rates. In this paper, the TES (Transform-Expand-Sample) methodology is used to model low rate MPEG4 video. The performance of a surveillance video application is evaluated over wireless Zigbee networks. A Rate Control algorithm (RC-VBR) adapted to MPEG4 Variable Bit Rate (VBR) video coders is studied over Zigbee networks. The algorithm avoids unpredictable rate variations of the VBR coding and removes the coding delay in Constant Bit-Rate (CBR) coders.
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