Dynamic adaptive code rate selection method based on mpeg-dash protocol

Abstract

The invention discloses a dynamic adaptive code rate selection method based on a MPEG-DASH (MPEG-Dynamic Adaptive Streaming over HTTP) protocol. The dynamic adaptive code rate selection method comprises the steps of: firstly, establishing a HTTP connection between a server and a client; by the client, sending a HTTP Get request to the server, requesting to download a MPD file and storing the MPD file; after the server receives the request of the client, by the server, responding to the client and sending the MPD file, and by the client, downloading the MPD file and parsing the downloaded MPD file; according to an URL address obtained by parsing the MPD file, firstly downloading one part of a slice at the minimum code rate, placing the slice into a cache region, carrying out calculation, statistics and recording on a network bandwidth when the video slice is downloaded, and predicting a network bandwidth when a next video slice is downloaded; and by combining a current residue condition of video slices of the cache region, selecting a code rate for downloading the next video slice until the end. An effect of improving video quality to the greatest extent in the premise of smoothly carrying out playing is achieved, and viewing experience of a user is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of video transmission, relates to the transmission of streaming media video or audio based on the MPEG-DASH protocol, in particular to a dynamic adaptive code rate selection method based on the MPEG-DASH protocol. Background technique [0002] At present, with the continuous increase of network bandwidth, people's demand for media information is also increasing. According to a report released by Cisco in May 2017, by 2017, media traffic will account for 86% of the entire network traffic, and various media applications will become an indispensable part of people's information life. At present, various multimedia applications emerge in an endless stream, and they provide people with a comprehensive experience integrating audio, video, and graphics. People expect to obtain a faster, smoother, and higher-quality media service experience, and how to meet this demand has become a major difficulty in today's strea...

AI Technical Summary

Problems solved by technology

[0004] However, the MPEG-DASH protocol only defines the MPD file structure and streaming media slice format, and does not specify the process or mechanism for the client to select slice files. To some extent, the quality of the dynamic adaptive code rate selection method based on the DASH protocol is directly It determines the efficiency of streaming media transmission and the viewing experience of users, so the dynamic adaptive bit rate selection method based on DASH protocol has a lot of research and development space, but no similar technology has appeared yet

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