基于DASH标准的视频自适应传输方案

摘要

Aiming at the problem that the traditional streaming media technology can not adjust the video bit rate adaptively according to the real-time change of network bandwidth,a video adaptive transmission scheme based on DASH standard was proposed.Based on the influence of the duration of video segments on the quality of video viewing experience,an adaptive bitrate algorithm was designed.Compared to other adaptive bitrate algorithms,the proposed algorithm is better than other algorithms in bit rate switching times,bit rate switching polarity and the convergence time of achieving the highest video quality.The proposed method was applied to the built DASH player.Experimental results show that the scheme can predict the bit rate of the next video segment more accurately and further improve the quality of video viewing experience.%针对传统的流媒体技术无法根据网络带宽的实时变化自适应调节视频码率的问题,提出一种基于DASH标准的视频自适应传输方案.利用视频分片的持续时间对用户观看视频体验质量的影响,设计基于视频分片的码率自适应算法,通过与其它码率自适应算法进行比较,验证该算法的码率切换次数、码率切换极性和达到最高视频质量的收敛时间优于其它算法,并将其应用到构建的DASH播放器中.实验结果表明,该方案能够更加精确预测下一个视频分片的码率,进一步提高用户观看视频的体验质量.