隨著多媒體應用在手持式裝置與數位家庭中日漸普及，網際網路已經成為影音多媒體傳輸的主要媒介，而提供線上租售的隨選視訊系統將漸漸地取代傳統實體租售型態。另一方面，傳統電視逐漸進化到具有網路多媒體功能之智慧型電視系統(smart TV)，因此多人共享之網路頻寬分配與品質控制更加顯得重要。若以主從式架構傳送多媒體資訊之大量碼流將造成傳輸上的負擔，間接影響播放品質，如延遲與失真等。本論文針對此一網路多媒體發展趨勢之實際需求，整合多媒體編解碼、網路串流與隨選視訊(Video on Demand, VOD)功能，實際設計開發可應用在點對點(Peer-to-Peer)網路傳輸之隨選視訊系統。本系統利用點對點傳輸技術讓使用者端可以降低伺服器在服務大量使用者時所產生的頻寬瓶頸。系統並具備真視訊點播(True Video on Demand, TVOD)功能，使原先串流影音所無法達到之定點播放功能皆能運用適用此系統。期望藉由實際開發系統與效能驗證，觀察點對點隨選視訊系統對網路頻寬瓶頸所能改善之程度。系統實作結果顯示，本論文所提出的系統運作方法對於媒體伺服器在頻寬瓶頸和處理器負擔上有大幅度的改善。

With the advance of network and multimedia technologies, various platforms can effectively handle multimedia communications, such as hand-held devices and digital home systems. The Internet becomes prevalence for multimedia communications, and the online video program vendor is replacing the real store. In addition, the TV system has evolved from conventional TV broadcasting to smart TV system that provides interactive interface. Under this TV evolution, the shared Internet bandwidth has to be well allocated to provide satisfactory quality of service for users. The simple server-client approach cannot provide sufficient bandwidth and processing capability when many users request media service simultaneously, which would result in long delay and quality degradation. This thesis is motivated from the requirements of developing network multimedia system, which comprises media codec, streaming, and Video on Demand (VOD) function, over the P2P network platform. We proposed to implement the VOD system based on P2P network platform, such that the server loading, e.g., CPU and bandwidth usage, can be shared among active peers. The proposed system can also provide True Video on Demand (TVOD) service, through which the repeat play function can be implemented in streaming video. By implementing practical P2P VOD system, we can justify the proposed method in improving the bandwidth utilization and video quality. From practical system implementation, the proposed TVOD system can effectively eliminate the bandwidth bottleneck and heavy processer loading to improve the system performance.

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