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Research on Seamless Splicing Technology of Transport Streams

Author: ZhengBingYang
Tutor: LiGuiZuo
School: Tianjin University
Course: Signal and Information Processing
Keywords: Digital TV MPEG TS stream Seamless
CLC: TN941.3
Type: Master's thesis
Year: 2006
Downloads: 193
Quote: 2
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Abstract


With the release of the development of digital video technology and a variety of related standards, digital TV has entered a practical stage, digital TV to replace analog television has become an inevitable trend. In this conversion process, the television center is facing a series of problems and challenges. Program production, editing and advertising spots, broadcast digital TV programs are an important link, the key technology is the carrier of digital TV programs - TS stream seamless. The departure from the MPEG-2 standard, through in-depth study of its basic system layer and video layer, pointed out the technical difficulties faced by seamless MPEG-2 transport streams, explore the principle and the need for seamless TS stream meet the conditions put forward the implementation of the two programs seamless system layer and based on the basic layer, and the corresponding experimental study and validation of the algorithm, the experimental results are given. Based on the seamless splicing of the system layer, simply based on the syntax of the MPEG-2 system layer, the TS stream processing spell stream and fight inflow of not need demultiplexing, decoding, encoding and re-multiplexing, splicing stream substantially do not change the original The contents of the stream. Its key technology is the choice of the splice point, the TS flow-related information (including the PSI the information and time information) of the adjustment, as well as audio and video synchronization. The advantages of this program is quick and convenient, and the original stream can be basically maintained, but due to the compression limit of the code stream of the image coding type and picture sequence, the splicing must be selected in a specific location found splicing, can not be precisely into the frame. In order to meet the demand for frame-accurate splicing, the thesis proposes a program based on the seamless base layer. The core of the program of encoding conversion, its role is to convert the picture coding type does not comply with the splicing requirements and associated image sequence, to become a legitimate splicing point. In this scheme, as the outflow and inflow of the TS stream is going through the demultiplexing and re-multiplexing, in the vicinity of the splicing point, but also for the decoding and re-encoding. The core part of the transcoding platform. As the algorithm research, these two programs are currently in offline circumstances TS stream data files, spliced ​​stream the the TS data file in the form storage. Such off-line processing, to meet the needs of the television center prefabricated program; processing speed fully meet the real-time requirements, so the algorithm can be applied to real-time device. Showed that the splicing flow generated by the objective analysis and subjective evaluation, splicing stream two programs are in line with the MPEG-2 standard, the parameters are correct, decode and display the normal to smooth image scene near the splice point conversion, sound Video good synchronization.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > TV > TV signal theory > TV digital technology
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