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The traditional way to composite texts and images over a video clip for presentation encounters such problems as time consuming, instructor skill scarcity, video retrieval difficulty, and video quality loss, especially, in internet high-compressed video materials. To solve these problems we develop a real-time remix platform for video-based presentation which can edit and synchronize online/offline video materials, texts, and images simultaneously. This system provides B/S architecture for users to control the program on a server through a client. The system's other features include application of adaptive program for different video formats, saving of annotations and other mixed media data in XML files for future reuse, and employment of Ajax to refresh user's work instantly. Further, some implementations of the system are explored in language learning and physical education.