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This research proposes a framework for adaptive streaming of MPEG-4 video, with a focus on congestion control and selective reliability. The use of binomial congestion control reduces layer switching and achieves smoother rates compared to AIMD, resulting in better perceptual quality and lower buffering requirements. The approach also includes selective loss recovery and RTP-compatible extensions for detecting lost portions of the bitstream and requesting retransmission. This framework can be applied to both simulcast and hierarchical encodings.
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RTSP MPEG Server MPEG Client loss/RTT/requests data loss/RTT/requests data loss/RTT RTP/RTCP RTP/RTCP callbacks CM Simulcast/AIMD Simulcast/Binomial A Framework for Adaptive Streaming of MPEG-4 VideoNick Feamster Deepak BansalAdvisor: Prof. Hari Balakrishnan Motivation Results • - Rising demand for streaming media on the Internet • Need an open system which supports congestion control and selective reliability • - Losses in interframe compression schemes result in propagation of errors - Selective retransmission allows for the recovery of most important data and limit propagation of errors. - Binomial congestion control reduces layer switching and achieves smoother rate than AIMD: - Better perceptual quality - Lower buffering requirement for more timely delivery - Results can be applied to both simulcast and hierarchical encodings Approach • Selective Loss Recovery • - Loss of reference frame data dramatically reduces PSNR • - RTP-compatible extensions provide semantics for: • - Detecting lost portions of bitstream and request for retransmission • Congestion Control • TCP’s AIMD policy results in large rate oscillation: need smoother congestion control • Allow the application to make the appropriate congestion control decisions QA/Binomial QA/AIMD MIT Laboratory for Computer Science
