An Adaptive Transmission Algorithm Based on Pi Controlled Streaming Media

Abstract

The invention relates to an adaptive transmission algorithm based on PI control streaming media, comprising the following steps: the estimated throughput is calculated; the video allowance in a buffer is calculated; at the initial stage of video playing, the method enters a stage of quick start when the buffer is smaller than a target buffer and enters a stage of adaptive transmission when the buffer reaches the target buffer; in the stage of quick start, an adaptive algorithm based on real-time throughput is adopted; and in the stage of adaptive transmission, an adaptive transmission framework based on PI control is adopted, the offset of the buffer relative to the target buffer is used as error feedback information, and a dynamic control factor is introduced to combine a PI controller and an ITB controller nonlinearly. According to the invention, the PI controller and the ITB controller are combined nonlinearly by introducing the dynamic control factor and dynamically controlling the degree of control of the PI controller and the ITB controller, which can prevent problems caused by buffer overflow, such as video playing stagnation or low bandwidth utilization rate.

Description

technical field [0001] The invention belongs to the field of self-adaptive transmission of streaming media under a wireless network, and in particular relates to a self-adaptive transmission algorithm of streaming media. Background technique [0002] With the rapid development of the Internet and various smart terminals, people's demand for multimedia information such as video and audio is increasing, which poses a huge challenge to multimedia service providers. Therefore, the streaming media technology emerges as the times require. However, due to the instability of the network and the heterogeneity of each smart terminal, the streaming media technology has problems such as poor adaptation and compatibility. [0003] In order to establish a common standard, the Motion Picture Experts Group (MPEG) started to conduct research in 2009, and proposed dozens of common protocol solutions, and jointly proposed HTTP-based protocol schemes with the Third Generation Partnership Projec...

AI Technical Summary

Problems solved by technology

Among them, the adaptive algorithm based on throughput only considers the bandwidth of the network and ignores the impact of the cache on the user, so it is easy to cause the buffer overflow of the client; the adaptive algorithm based on the cache guarantees the security status of the cache, but it is easy to cause the video quality of the application fluctuation

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