一种新的IP网络视频通信丢包错误纠正方案
A Novel Lost-Packet Recover Scheme for Video Communications over IP Networks
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摘要: 分组丢失是IP交换网络常见的现象。该文针对下一代网络多媒体通信，提出了一套IP网络抗分组丢失的方案。包括纠删编码、打包和发送以及接收端错误掩盖。与常见的纠删编码相比，该文提出的[9,5,3]码具有构造简单，编解码时间短，纠删能力高的优点。打包和发送方案根据[9,5,3]码的纠删性能对视频数据打包，并以一定顺序发送，提高了纠删码抗突发错误的能力。采用新的视频编码方案H.264所提供的抗误码工具灵活的宏块次序(FMO)，对纠删失效的视频数据在解码端进行错误掩盖。Abstract: It is very common that the packets may be lost over IP networks during transmission. The scheme proposed in this paper involves a novel erasure correcting code, a packet sending order and error concealment method. The [9,5,3] erasure correcting code in this paper has excellent lost recovering capability, linear encoding and decoding time and is easily constructed. The packetization method increases the capability of error resilience against the burst packet loss. The error concealment tool FMO of H.264 is used to deal with the video information packet that can not be recovered.
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ITU-T, H.264: Advanced video coding for generic audiovisual services, May, 2003.[2]慕建军, 路成业, 王新梅. 关于纠删码的研究与进展. 电子与[3]信息学报, 2002, 24(9): 1276－1280.[4]RFC2733An RTP payload format for generic forward error correction, December, 1999.[5]王新梅, 肖国镇. 纠错码原理与方法(修订版), 西安：西安电子科技大学出版社, 2001: 第3章[6] Wenger S. Common conditions for wire-line, low delay IP/UDP/RTP packet loss resilient testing. ftp://ftp.imtc-files. org/jvt-experts/0109_San/VCEG-N79r1.doc, 2001.[7] VCEG. Internet error patterns VCEG-O38r1. doc. ftp://ftp. imtc-files.org/jvt-experts/9910_Red/Q15 -I16r1.zip, 1999.[8]Wenger S. H.264/AVC over IP[J].IEEE Trans. on Circuits and Systems for Video Technology.2003, 13(7):645- -
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