The demand of bringing multimedia information systems into distributed environments makes multimedia synchronization more difficult. In order to eliminate the side effects which result from delay jitters, we propose a bounded buffer allocation scheme, in which the audio stream adopts the blocking synchronization scheme and the video stream adopts the non-blocking synchronization scheme, for live audio and video presentations in this paper. The forward synchronization schemes are performed to overcome the asynchrony anomalies. Once some anomalies of presentations are detected, a forward re-synchronization scheme is triggered to eliminate the asynchrony anomalies. Neither a global clock nor a feedback mechanism is needed using the proposed method. Based on the proposed method, trade-offs between the presentation qualities and networking resources are mathematically calculated. According to these calculable trade-offs, users can derive their own (acceptable) presentation qualities of live video and live audio media based on their available networking resources