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In this work, we investigate the impact of mobility on video streaming over multi-hop wireless networks by utilizing a class of scheduling schemes. We show that node spatial mobility has the ability to improve video quality and reduce the transmission delay without the help of advanced video coding techniques. To describe a practical mobile scenario, we consider a random walk mobility model in which each node can randomly and independently choose its mobility direction, and all the nodes can identically and uniformly visit the entire network. The contributions of this work are twofold: 1) It studies the optimal node velocity for the mobile video system. In this case, it is possible to achieve almost constant transmission delay and video quality as the number of nodes increases; 2) It derives an achievable quality-delay tradeoff range for different node velocities. Therefore, it is helpful to shed insights on network design and fundamental guidelines on establishing an efficient mobile video transmission system.