基于帧拆分的MPEG视频的可靠传输

Robust MPEG Video Transmission Based on Frame Partition

1. 前言 近年来在Internet上传送MPEG视频的需求和应用越来越多.多媒体交互式应用要求短时延,一般采用UDP协议进行传送,但UDP是不可靠传输协议,传送过程中的包丢失将导致视频质量下降.MPEG使用的帧间预测技术使得一旦I-帧或P-帧在传送中丢失,依赖它们的许多帧将受影响,即使很小的包丢失率也会严重影响接受到的MPEG视频的质量.

This paper provides a robust MPEG video transmission scheme based on frame partition:according to the playback rate,frame partitioner divides the MPEG video flow into two sub-flows with different priorities,the important data are stored in the high-priority sub-flow. After being Reed-Solo-man coding, the high-priority sub-flow is sent together with low-priority sub-flow parallelly. This scheme is particularly designed for MPEG video transmission,and the MPEG video frame's characteristic is fully considered while designing the frame partitioned RS coding and sending way. Test results show that this scheme guarantees video transmission's QoS,optimizes sender's bandwidth utilization and improves the network performance.