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For the reason of unreliable and shared media, supporting video streaming over wireless multi-hop networks faces greater technical challenges. In this paper, we investigate the optimization issue and propose a joint source-network coding scheme, which segments the streaming source into generations so as to maximize the video streaming quality. The factors influenced by the size of generation include the source rate, the efficiency of coding and the decoding delay. At the source node, the faster the source rate, the more packets generated. At the intermediate nodes, the number of packets transmitted into the network is decided by the network coding strategies. The experiment results indicate that with appropriate generation size, the joint source-network coding scheme can enhance the performance of video streaming over the wireless multi-hop networks.