發(fā)布時間：2018-01-04 20:31

  本文關鍵詞：視頻轉碼傳輸系統(tǒng)的設計與實現(xiàn)　出處：《西安電子科技大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： FFMPEG 視頻轉碼 AVS RTP Web Service

【摘要】：隨著多媒體通信技術的日新月異,視頻編解碼技術、視頻網絡傳輸技術和網絡視頻監(jiān)控技術得到了飛速發(fā)展,根據(jù)各種設備和播放軟件的不同,人們對于網絡視頻的實時轉碼傳輸播放,包括格式、分辨率、碼率、幀率等的轉換都有不同需求,這就需要一種完善的視頻處理系統(tǒng),同時隨著平安社會的建立,隨時、隨地的實時監(jiān)控成為了現(xiàn)階段發(fā)展的一個重點。本文從以上實際出發(fā),在編解碼理論和Web服務的支撐下,研究和開發(fā)了基于Windows平臺的視頻轉碼傳輸系統(tǒng)。本文首先分析了FFMPEG源碼庫的結構,通過FFMPEG提供的編解碼模塊和接口函數(shù)設計了本文所需的轉碼模塊。由于FFMPEG不支持H.264和AVS(Audio Video Coding Standard)的編碼,因此通過數(shù)據(jù)結構的建立實現(xiàn)了H.264和AVS外部編碼庫在FFMPEG中的擴展。同時FFMPEG不支持AVS的封裝與解封裝,所以本文基于RTP(Real-time Transport Protocol)協(xié)議設計了AVS視頻流的封裝和解封裝模塊,并通過數(shù)據(jù)結構的建立和接口函數(shù)的調用實現(xiàn)了AVS解封裝模塊在FFMPEG中的擴展。然后設計了通用轉碼接口函數(shù),為后續(xù)Web服務的建立提供方便。通過對上述模塊的測試,結果表明:轉碼模塊支持H.264、H.263、MPEG-4和AVS四種視頻流的格式、碼率、幀率及分辨率之間的相互轉換。最后,基于上述通用轉碼接口函數(shù),采用Web服務的方式,本文創(chuàng)建了源端和轉碼端業(yè)務模塊,利用gSOAP工具對源端服務和轉碼端服務進行了部署,設計了客戶端的控制程序,通過TCP(Transmission Control Protocol)協(xié)議的socket編程實現(xiàn)了消息傳輸,同時通過python語言創(chuàng)建了客戶端用戶界面,完成了基于Windows平臺的視頻轉碼傳輸系統(tǒng)的總體設計,并對各個模塊的實現(xiàn)進行了詳細的介紹和說明。本客戶端軟件能夠提供簡單、友好、易用的操作界面。系統(tǒng)經過實際測試,在客戶機的控制下,源端對本地視頻流文件或者監(jiān)控視頻進行實時播放和傳輸,轉碼端實時接收、轉碼和傳輸,客戶機進行實時播放,具有隨時開啟和隨時停止的功能。分析表明:在無誤碼環(huán)境下,支持高清視頻流25fps的轉碼和流暢播放,并且分辨率為720P以下的延時小于1s,分辨率為720P和1080P的時延在1.5s以內,同時整個視頻轉碼傳輸系統(tǒng)運行穩(wěn)定。
[Abstract]:With the development of multimedia communication technology change rapidly, video codec technology, video transmission technology and video surveillance technology has been rapid development, according to a variety of devices and playback software, people in the network video transmission and playback of real-time transcoding, including format, resolution, frame rate conversion rate, etc. have different needs, which requires a perfect video processing system, and with the establishment of the peace society, at any time, anywhere real-time monitoring has become a focus of the present stage of development. This article starts from the reality, in the coding and decoding theory and Web service support, research and development of video transcoding transmission system based on Windows platform. This paper first analysis the structure of the FFMPEG source library, provided by FFMPEG codec module and interface function module design transcoding needed in this paper. Because the FFMPEG does not support H.264 and AV S (Audio Video Coding Standard) encoding, so the data structure to realize the expansion of external H.264 and AVS encoding Library in FFMPEG. At the same time, FFMPEG does not support AVS encapsulation and de encapsulation, so this paper is based on RTP (Real-time Transport Protocol) protocol to design the encapsulating module of AVS video stream, and realize the extended AVS solution package module in FFMPEG through the establishment of data structure and interface function call. Then the design of the general transcoding interface function, established for the subsequent Web service to provide convenient. Based on the module test results show that the transcoding module supports H.264, H.263, MPEG-4 and AVS four video streams format, rate, conversion between frame rate and resolution. Finally, the universal transcoding interface function based on using Web services, this paper creates the source and end transcoding service module, using gSOAP The tool service source and transcoding end services were deployed, the control program was designed by the client, TCP (Transmission Control Protocol) protocol socket to realize message transmission, at the same time through the python language to create a client user interface, complete the overall design of video transcoding transmission system based on Windows platform, and the realization of each module is introduced and explained. The client software can provide a simple, friendly, easy to use interface system. After the actual test, under control of the client, the source of the video stream files or video playback and real-time transmission, the receiving end real time transcoding, transcoding and transmission of customer for real-time playback, and is open at any time at any time to stop function. Analysis shows that in the error free environment, support 25FPS HD video stream transcoding and smooth playback, and And the delay of the resolution is below 720P is less than 1s, the time delay of 720P and 1080P is within 1.5s, and the whole video transcoding system is stable.

【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.81

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本文編號：1379997