【摘要】 文章在笔者建立的区分服务网络模型的基础上,根据视频编码的特点,提出了一种针对视帧传输的新的服务优先等级标识算法,即根据不同视频帧解码时的重要程度和网络的传输状况将不同视频帧的数据包标记为不同等级,赋予不同的质量保证。该策略是针对网络严重拥塞和极低码率视帧编码序列而提出的。实验表明,在网络严重拥塞(实际带宽低于要求带宽70%以下)、有大量数据包丢失时,也可在解码端利用差错掩盖(ErrorConcealment)技术很好地恢复出视频图像,且接收到的IP包的延迟及延迟抖动也很小,完全符合实时传输的要求。更多还原

【Abstract】 In this paper,a novel video marking algorithm for IP DiffServ based on the transmission condition and the different importance of video streams for decoder has been introduced.Using the marking algorithm,video transmission over the IP DiffServ networks model which have set up has been studied.Combined with the error concealment technol-ogy in the video decoder,in case of severe congestion which cause losing a lot of IP packets,the algorithm has been proved effective,hence the delay,jitter and the perceived picture quality entirely meet requirement for real-time video transmission.更多还原