Abstract
A feedback-based Internet video transmission scheme based on the ITU-T H.263+ is presented. The proposed system is capable of continually adjusting the stream size to avoid the congestion in response to network condition changes. It consists of several major components such as TCP-friendly end- to-end congestion control with available bandwidth estimation, encoding frame rate control and transmission buffer smoothing at the server. These components are designed to meet the low computational complexity requirement so that the whole system can operate in real time. Among these, video-aware congestion control, which is called the receiver-based congestion control mechanism (RCCM), and the variable frame rate H.263+ encoding are the two key features. Through a seamless integration of these feature components, it is demonstrated that network adaptivity is enhanced to mitigate the packet loss and the bandwidth fluctuation, resulting in a smoother video experience at the receiver.
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