A code rate switching method for dynamic adaptive video transmission based on state machine

Abstract

The invention belongs to the field of multi-media communication, and in particular relates to a state machine based dynamic adaptive video transmission code rate switching method. The state machine based dynamic adaptive video transmission code rate switching method comprises the steps that: a server side slices a stored video; each video clip has K code rate grades; a client side calculates the average code rate, the mean square deviation and the average bandwidth of N video clips according to the newly downloaded N video clips; the code rate offset rate and the playing cache of the client side when downloading of the kth video clip is completed are obtained; and, due to different ranges of the playing cache and different ranges of the code rate offset rate, code rate switching is carriedout according to a code rate state switching formula. According to the state machine based dynamic adaptive video transmission code rate switching method disclosed by the invention, the contact between the video code rate and the numerical value change of an influence factor is used as a state transition condition; on the premise that the playing cache and the code rate offset rate are a certainthreshold value, the code rate is switched to the code rate grade that the whole performances of the video quality and the playing fluency are relatively best; and thus, better user viewing experienceis realized.

Description

technical field [0001] The invention belongs to the field of multimedia communication, and in particular relates to a code rate switching method for dynamic self-adaptive video transmission based on a state machine. Background technique [0002] Traditional streaming media technologies, such as Real-time Transport Protocol (RTP) and Real-time Streaming Protocol (RTSP), have firewalls, Network Address Translation (NAT) traversal, high installation and deployment costs, etc. question. Dynamic Adaptive Streaming over HTTP (DASH) technology based on HyperText Transfer Protocol (HyperText Transfer Protocol, HTTP) came into being. The HTTP protocol is used as the transmission protocol because the HTTP data packet can well solve the firewall and network address translation traversal problems, and at the same time, it can effectively use the existing network service architecture, and the existing HTTP server can provide good video services, which is greatly improved. Reduced deplo...

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Problems solved by technology

[0004] In view of this, the method of the present invention can not well solve the contradiction between playback fluency and video quality at the video code rate adaptive algorithm of existing HTTP dynamic self-adaptive streaming media transmission technology; The purpose of the present invention is to provide a kind of A code rate switching method for video transmission that fully considers the bandwidth utilization rate and the code rate switching range, specifically a state machine based dynamic adaptive video code rate switching method (State machine based Dynamic Adaptive Streamingover HTTP, SDASH), which can Provide better QoE for customers in the process of requesting video

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