摘要
3G网络视频传输存在丢包率高,实时性差,带宽不稳定的问题。设计并实现了一套面向WCDMA智能终端的无线视频传输系统。系统分为2部分,基于TI TMS320DM3730的视频采集子系统和WCDMA手机接收子系统,视频采集子系统实现了视频采集、H.264压缩、无线网络传输和RTP/RTCP协议智能带宽控制等功能,接收子系统实现了WCDMA智能手机的视频接收、解码和显示。实际测试表明,该系统有效降低了对WCDMA网络带宽的需求,可自动适应WCDMA网络传输带宽的波动,视频数据的丢包率、延时等指标均有较大幅度提升,从而有效提高了视频的清晰度和稳定性。
The 3G wireless video transmission has some problems on high packet loss rate,poor real-time performance and unstable bandwidth.In this paper,a wireless video transmission system based on WCDMA intelligent terminals is designed and implemented to solve these problems.The system is divided into two parts,video capture subsystem based on TI TMS320DM3730 and WCDMA mobile phone receiving subsystem.The video capture subsystem realizes some functions such as video capture,H.264 compression,WCDMA wireless network transmission,RTP / RTCP protocol intelligent bandwidth control.The receiving subsystem implements mobile phone video receiving,H.264 decompression and display.The practical tests show that the system has reduced the demand for WCDMA＇s bandwidth.It can adapt to the WCDMA transmission bandwidth fluctuation automatically.Video data＇s packet loss rate,delay and other indicators are significantly promoted,thus the system effectively improve video＇s clarity and stability.
出处
《电子测量技术》
2014年第7期101-106,共6页
Electronic Measurement Technology
基金
国家自然基金(61171085)项目
