This paper proposes a novel object-based rate control algorithm to transmit real-time video over variable ad-hoc wireless channels by employing an adaptive rate control algorithm. The algorithm characterizes the variable data rate of the ad-hoc wireless system by by the packet-level Gilbert twostate Markov Model, estimates the available channel bandwidth between the sender and receiver, and adjusts the output rate of Video encoder using R-D framework and frame-skip control mechanism to fit the estimated time-varying channel bandwidth. Simulation results show that this proposed algorithm can effectively utilize the network capacity while avoiding packet loss as the number of hops between source and destination changes, improves the realtime video quality.