基于嵌入式终端视频聊天业务的性能优化

Optimization for Embedded Devices in Video Chat System Based on IPTV Network

随着IPTV的兴起,作为IPTV增值业务的视频聊天业务越来越受到关注。基于嵌入式终端的视频聊天业务,具有时延受限和传输速率受限的特点。为了解决两者之间的矛盾,本文提出了一种方法,该方法根据时延限制和最大的传输速率,在发送数据时采取主动丢弃策略。当视频流量突发时,通过删除部分B帧,避免接收端的解码器持续下溢。仿真实验结果表明,采取主动丢弃策略后,播放效果相比未采取主动丢弃策略时有显著改善。

Video chat service based on embedded devices has wide application prospect.But the sending rate of embedded devices is constrained and it will inevitably lead to a great end-to-end delay.In this paper,we adopt frame-dropping algorithm.By dropping some B frames,the peak rate of VBR video traffic is weaken.The simulation results show that frame-dropping algorithm can guarantee acceptable end-to-end delay and avoid buffer underflow.