隨著科技的進步，愈來愈多不同類型的裝置進入了人們的生活中，愈來愈多的影音串流需求被應用在電腦以外的裝置上，例如智慧型手機以及平板式電腦。針對這些不同的裝置，預期要提供不同品質的即時影音串流，例如電腦大螢幕適合觀看Full-HD 1080p解析度的影音串流，但是手持裝置如智慧型手機對於解析度的要求可能就只需要到360p而已。本篇論文的出發點在於設計這樣的一個能同時提供多重品質的影音串流轉播平台。
H.264/SVC是屬於ISO/IEC 14496 MPEG4 Part.10 H.264影像壓縮標準的一種延伸標準，他是基於H.264/AVC影像壓縮的特性上再延伸出可調式編碼特性的編碼方式，利用這個特性能夠將一個完整的H.264/SVC影像串流或檔案按照各種不同的條件解碼成數種不同品質的影像以應用於各種不同的裝置與環境。
本篇論文著重於設計一個能夠發揮SVC特性與優點的即使影音串流分享平台，包括針對SVC可調式編碼的特性所設計的多重樹(multi-tree)傳播方式以及透過分散式計算(distributed computing)的方式做到能夠支援到全高畫質(full-HD 1080p)的SVC編碼與解碼方案，這樣的一個平台預期能夠同時為不同的裝置提供不同品質的即時影音串流，以及允許在網路傳輸速度變動大的環境下能夠允許裝置動態的調整收到的影音串流的品質，以符合SVC具可調式編碼的特性。
最後這個平台將結合雲端運算(Cloud computing)，利用雲端的"架構即服務(IaaS: Infrastructure as a Service)"服務建構一個低成本、高可調動性的雲端服務系統。這樣的一個平台預期能提供轉播者簡易的影音輸入方式並且在平台內編碼成SVC串流，並且在平台內為各種不同類型裝置的觀眾分群解碼出各種不同品質的即時影音串流，直接以解碼過後的H.264/AVC影音串流讓觀眾收看。

With the progression in technology, there are more and more requirements of real-time video streaming of different devices nowadays. Users may use different devices to watch the same content. For example, someone may seat at home and watch a MLB live show by a high-definition TV, but someone may seat at bus and watch the same MLB show by his own smart phone. Obviously, we should push the HD quality streaming to the HD TV, but push 360p or lower quality to smart phone. Therefore, we should supply the same content with different qualities at a time to serve different users in different situation.
Scalable Video Coding (SVC) is an extension compression profile of ISO/IEC 14496 MPEG4 Part.10 H.264;it can supply different qualities by using different decoding parameters according to different situations. Our goal is to exert this feature of SVC to build such a real-time streaming broadcast platform which can supply different qualities of video streaming at a time.
First of all, we divide a SVC streaming to many subsets streaming and forward them independently. This is a multi-tree relay structure. The advantage of this structure is we can decide how many relay tree we receive from depends on which quality we want to watch. Second, we do the SVC encoding and decoding in our platform so that streaming providers can push its raw video streaming to our platform easily and audiences can watch the streaming directly. Third, we use the concept of distributed computing to achieve full-HD 1080p SVC real-time en/decoding so that this platform can support full-HD live streaming broadcast. Eventually, we use Cloud computing to build our platform as a result of us want to implement a low cost and high scalability service. We expect this platform can broadcast the live contents with different qualities easily.

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