Research And Implementation Of Video Interview And On Demand Technology Based On Android System

With the development of computer network technology,mobile intelligent terminals and Internet technology are becoming more and more mature.At present,the coverage of 4G and WIFI network is very high,and the performance of mobile terminal hardware has also been greatly improved.This creates favorable conditions for smart phones to carry high load and high bandwidth systems.At the same time,people's demand for smart phones is not just the basic functions of telephone and text messaging,but also the enjoyment of various life services provided by the Internet.In today's many mobile phone business,thanks to the excellent network environment and the needs of the vast number of users,video intercom and VOD(video on demand)have become the fastest growing and most popular business nowadays.With the increase of users and the arrival of 5G,the research on video intercom and VOD technology has broad prospects and great potential.Starting from the importance of video intercom and on demand technology,this thesis analyses the development trend of current Android system and the research status of video intercom and on demand technology at home and abroad.A video intercom and on demand system based on Android platform is studied and implemented.Moreover,on the basis of realizing the functions,this thesis also analyses the problems that echo is difficult to eliminate in the current mainstream video intercom and on-demand systems,and that video is vulnerable to network interference and piracy when playing.The echo cancellation algorithm,video buffer technology and video encryption algorithm are studied to improve the performance and practicability of the system.The main work of this thesis is as follows:(1)Aiming at the Android system development platform,the architecture and application development components of Android system are studied and studied in depth,which lays a foundation for the realization of the function of the subject.(2)Aiming at the function of video intercom,This thesis have studied the H264 video coding and G.711 audio coding,as well as the SIP protocol and RTP protocol for data transmission.Using the audio and video acquisition and coding technology inAndroid system,the video intercommunication function based on SIP signaling interaction and RTP data transmission is studied and implemented.Then the echo cancellation technology is studied,and the AECM algorithm in WebRTC technology is used to achieve echo cancellation and improve the audio quality.(3)For video on demand function,HTTP protocol,open source library of video playback and encryption algorithm are studied.This thesis uses HTTP protocol to obtain video information and ijkplayer open source library to play video.It studies and implements the VOD function with operable interface.Secondly,video caching technology and AES encryption algorithm are studied to solve the problem of video vulnerability to network impact and vulnerability,and to improve video fluency and security.(4)In view of the functions realized,a test method is proposed to test the functions,so as to improve the performance and stability of the system.