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In this paper, we present a stable buffer control strategy for video coding and transmission over ATM. This strategy assigns quantizer scales by considering the smooth quality, the transmission bandwidth and the buffer occupancy for each frame simultaneously. Besides, it has the learning capability of fitting various image sequences. This strategy was implemented on MPEG-i coding scheme. The simulation results show that the quality is almost identical to that produced by the pure MPEG-i while the output rate is maintained at a constant level.