With the development of the networks, transmission-of. The high -quality video as an important branch is developing quickly. However, only best — effort transmission service decided by IP network system could be provided. Due to the shortage of service quality guarantee, stable bandwidth required by video transmission cannot be ensued. Thus, network jamming is caused. Besides, the low processing power, low memory and limited hardware configuration of the phone make the video data can not be self adapted the network, which also affected the codec efficiency seriously. It finally led to the video data are lost in transmission and the quality of video received image is lowered. This paper describes a video adaptive algorithm based on Android. The network bandwidth can be detected dynamically in the algorithm, offers smooth data transmission bandwidth, and then ease jamming. Video adaptive algorithm controls video coding and transmission rate according to transmission bandwidth and improve video transmission quality. The result shows that the proposed algorithm can adapt the network and meet the requirements of perceptual quality of service.%目前随着网络的不断发展,高质量视频的实时传输作为流媒体的一个重要分支在快速地发展,然而IP网络仅能提供尽力而为(Best-effort)的传输服务,难以保证视频传输所需的稳定带宽,会引起网络拥塞.同时由于智能手机处理能力低、内存小等硬件配置因素,使得嵌入式媒体播放器中的视频数据无法自适应网络状况,严重影响视频流的解码效率,最终导致视频数据在传输过程中大量丢失,降低接收到的视频图像质量.基于此,该文提出一种基于Android的视频自适应算法,该算法可动态探测网络带宽,自动适应网络拥塞状况,制定平滑的数据传输带宽,缓解网络拥塞,根据传输带宽控制视频编码和视频传输速率,提高视频传输质量.结果表明,该算法可适应网络拥塞状况,提高视频传输质量,改善用户体验.
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