最近這幾年，由於資訊化、多元化之社會趨勢與網際網路之大眾化，導致民眾在高品質、高效率、高科技的視聽服務需求亦趨強烈；多媒體應用的相關研究亦充斥著整個學術與商業領域。綜觀現在的影音平台，觀察後發現仍缺少某些功能，如：1. 某些影片其實要即時的欣賞才有其價值存在，如：跨年倒數的影片等，所以影音平台若能提供直播的影片供網友欣賞，此網站一定可以吸引更多的使用者加入。2. 網站的經營業者可擁有像電視台那樣開設頻道的功能，可依公司的決策排程影片或直播節目，供網友觀看。3. 提供的直播節目串流不唯一，如：老師上課且需要用到投影片講解，此時應該要提供兩個同步的串流供學生觀看。因此，本篇論文實做一個具有上述所提及之功能且擴充性高的隨選視訊系統來滿足更多的使用者和業者。此外，由於可利用的網路頻寬漸增，所以隨選視訊系統也相繼推出提供高畫質、高解析的多媒體串流服務。但是頻寬也不是無限的，所以本篇論文所提出的系統也有將此一問題列入考量，以轉檔的技術進行多媒體檔案壓縮，達到減少頻寬的效果，致使使用者在瀏覽影片時，將能快速觀看影片，而不用浪費時間等待系統影片的緩衝。

With the fast development of technology and the increasing popularity of Internet in recent years, multitudes are becoming highly demanding for the multimedia services. Many researches on multimedia applications are studied the entire academic and business fields; however, we found many video platforms are still lack of some important functionality. Firstly, they do not support broadcast live streaming. Some videos are better seen as live broadcasting such as New Year countdown, election news, and political speeches. Therefore, whether the video platform can provide live videos or not, it will be able to attract more users in this business. Secondly, the administrator should have program schedule functionality such as TV. Lately, the multiple synchronized streaming may be required. For example, we would like to show professors’ lecture and the details of slides at the same time, and it will need two synchronous streaming. In this thesis, we implement a VOD system that has functionality of what are mentioned above and the system has high scalability to satisfy more and more users and businessmen. On one hand, due to promotion of bandwidth in LAN, VOD system launches the high quality multimedia streaming service. On the other hand, the bandwidth is not unlimited, so we proposed the issues to be considered as well. We apply encoding technology to compress multimedia file to reduce bandwidth. Hence, users can more quickly download the file rather than waste too much time waiting.

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