Ölçeklenebilir video akışı için uyarlama stratejileri

Traditionally, video transport has been realized over dedicated, fixed bandwidth channels, such as terrestrial, satellite, or cable. Hence, video coding standards, such as MPEG-2 and MPEG-4 AVC, encode video at a fixed target rate for a given resolution and application. With the advent of video over IP and WebTV, video transport must now be achieved over heterogeneous IP networks, including a variety of fixed and wireless links. It is well-known that achieving the best video quality in this heterogeneous environment requires an adaptive streaming framework that can most efficiently adapt the source video rate to the available network throughput.Fundamental blocks of an adaptive streaming framework are a codec that can output video at multiple rates, a transport protocol that employs effective rate/congestion control, and an adaptation engine built on top of these. This work is on realizing the adaptation engine by supplying it with proper adaptation strategies to be used both in coding and transport blocks. For that purpose, an adaptive video streaming system, which employs SVC as the video codec and DCCP or TCP as the transport protocol, is implemented to evaluate various adaptation strategies in streaming scalable video. The system is also extended to wireless domain, proposing a solution to differentiate between wireless and congestion losses and therefore improve the performance of DCCP in wireless networks.