With the development of multimedia technology, the increasing capacity of radio channels, and the widespread popularity of smart phones in recent years, demands for playing videos on various mobile terminals have been becoming more and more intense. This is not only reflected in the playing of diverse local media files, but also in video live broadcast or mobile video surveillance.Based on different kinds of terminates devices different kinds of channel capacity by combining extended code experiment Integrating the characteristics of scalable video coding technology,we introduced the architecture of a multifunctional video playing system, focusing on the design solution and implementation methods on Android platform.Compared to the original Android media player, the performance of this system has been greatly enhanced. Transplanting the universal decoding library FFmpeg. this system supports a variety of video encoding formats and file encapsulation types. As for real-time video streaming, the real-time transport protocol is applied to process data transmission and reception. With minimum playback delay, it fulfills the fundamental need of live streaming video.Further, with the assistance of video streaming server, it can also be used as mobile monitoring client and "I am on the scene* or any other video instant sharing modules.%随着多媒体技术的发展和无线通信带宽的增加,以及近年来智能机广泛普及,人们在移动设备上享受视频服务的需求日益强烈.这不仅仅体现在对编码格式多样的本地视频文件观看上,同时还体现在实时手机视频直播或移动视频监控上.基于在各种终端设备各种信道容量条件下都能观看高质量视频的目的,通过结合可扩展编码的实验提出了一种基于Andorid系统平台的视频压缩优化编码的设计.介绍了Android系统及其上的应用开发,阐述了传统H.264编码模式选择的思想,重点描述了模式选择的优化方法.结合可扩展编码的特性,设计实现了一款基于Android平台的多功能播放系统,相比Android系统原生配备的播放功能,系统性能有了明显提升.通过移植源的视频解码库FFmpeg,系统实现了对多种视频编码格式和文件封装类型的支持,同时针对实时视频流,系统釆用实时传输协议进行数据的发送和接收,具有较低的网络延迟,能够满足视频直播的基本要求.结合可扩展编码技术并配合视频服务器,还可用于移动视频监控或具备"我在现场"等视频即时分享功能,为异构环境下的视频服务提供了有效的解决方案.
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