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The real-time video communications over the Internet can be affected by packet loss problem because the current Internet does not guarantee quality of service (QoS). Video applications are necessary to apply some mechanisms to minimize the effect of packet loss. In this paper, we propose a new algorithm in adaptive quality control for real-time MPEG-4 video communications. The proposed algorithm changes the value of an encoder parameter, key frame interval, based on network congestion in order to control the quality of the received video not to be unacceptable. And the experimental result shows that the proposed algorithm can adapt the value of key frame interval appropriately and it can control the quality of the received video in both spatial and temporal quality.