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实时流媒体数据业务由于网络服务的多媒体化受到人们的广泛关注.针对实时流媒体业务在IP网络上传输由于丢包、延时等现象引起的质量问题,本文利用数字喷泉技术,对H.264实时视频设计了一种具有不等差错保护的系统喷泉码的度分布,用以改善实时流媒体数据在IP网络上传输的性能.设计了一种I帧分布,能够根据信道删除率对H.264视频的I帧数据包进行高等级保护,接收方能以较高的概率优先恢复出I帧数据.仿真结果表明:在信道删除率确定的情况下,与同等差错保护的鲁棒分布相比,使用I帧分布能得到更高PSNR值的视频流,同时具有更短的解码延时,系统的性能得到较大的改善.
Real-time streaming media data services are widely concerned by many people because of multimedia services.Aiming at the quality problems of real-time streaming media services transmitted over IP networks due to packet loss and delay, this paper uses digital fountain technology to analyze H.264 In real-time video, a degree distribution of system fountain codes with unequal error protection is designed to improve the performance of real-time stream media data transmission over IP networks. An I-frame distribution is designed based on channel deletion rate. I-frame data packet of H.264 video is high-level protected, and the receiver can recover I-frame data with higher probability first.The simulation results show that in the case of determining the channel deletion rate, compared with the robust distribution of equal error protection , The use of I-frame distribution can get higher PSNR video stream, while having a shorter decoding delay, the system performance has been greatly improved.