Downhole TV Client Application Development Based On ONVIF Protocol

With the development of network technology and the advancement of technology,the development of network video has begun to expand from video surveillance to video detection.Downhole TV is a special device system for detecting downhole conditions.It uses a special camera to photograph and record downhole real-time conditions,and can accurately and clearly reflect the real-time conditions downhole to the ground client.It is convenient for the staff to directly observe and master the status of the open hole,cased hole and various production wells according to the images presented by the client.In the logging process,due to the large differences between network monitoring devices,it is necessary to solve the intercommunication problems between them.In addition,in the logging process,sometimes the client is required to superimpose subtitles on the video in an arbitrary manner so as to clearly reflect the situation downhole.This requires the OSD subtitle superimposition function of the video.This article studies the downhole TV client based on the ONVIF protocol.The client can implement preview,play real-time video,video storage,PTZ control and OSD subtitle overlay.The ONVIF protocol is used to solve the problem of interworking of network monitoring equipment.The main research work of this paper is as follows:1.First,a brief description of the development status of underground TVs and related technologies is given.Then the overall design plan and the design of each module are given.2.Study the ONVIF protocol and build a service framework.This module can realize video equipment discovery,device management,and video stream acquisition.3.Perform RTSP transmission and codec processing on the video stream.This article uses the h.264 codec technology.4.Through the secondary development of VLC,complete the video playback,video storage,PTZ control,OSD subtitle overlay function.5.Conduct functional tests on each module,and finally,summarize the research work of this article,point out where this article needs to be improved,and look into the next step of research.