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The Research and Application of Real-Time Packet Video Quality Based on the Condition of the Net

Author: HangJiaWen
Tutor: LiuJinGao
School: East China Normal University
Course: Communication and Information System
Keywords: video quality lossy packet networks mediastreaming IPTV 3Tnet
CLC: TN919.8
Type: Master's thesis
Year: 2008
Downloads: 220
Quote: 4
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Abstract


Recent year,there is a great development of the video based on the net. IPTV、P2P video、3G video are going to share more on the market. However,in the area of telecommunication the video system is still not so stable.To find the reason,we address the problem of video quality prediction and control for high-resolution video transmitted over lossy packet networks.In packet video,the bitstream ows through several subsystems(coder,network,decoder);each of them can impair the information either by data loss or by introducing some delay.However, each of these subsystems can be retuned in order to minimize these problems and to optimize the quality of the delivered signal,taking into account the available bitrate.The assessment of the end-user quality is a non-trivial issue.We analyse how the user-perceived quality is related to the average encoding bitrate and the lose of different frame(frame B、C and P)for variable bit rate MPEG-2 video,We then establish a arithmetic to describe this relationship.Furthermore,we use this arithmetic in the project "the monitor system of 3TNET".We then demonstrate that,when jointly studying the impact of coding bit rate and packet loss,the reachable quality is upperbound and exhibits one optimal coding rate for a given packet loss ratio.

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