一种视频流畅度优先的带宽自适应方法

AN ADAPTIVE BANDWIDTH METHOD IN VIDEO FLUENCY-PRIORITY

由于现有基于平均接收质量的带宽自适应方法,在自适应过程中会出现视频质量振荡,且在可用带宽急剧恶化时会出现中断的问题,提出了一种流畅度优先的带宽自适应方法。该方法引入了图着色优先级算法,在带宽自适应过程中,在保证视频的流畅播放的前提下,通过判断是否振荡调整,改变平均质量范围,以达到减少视频振荡次数的效果。仿真结果表明,该方法在自适应调整传输速率、有效利用带宽的同时,保证了流畅度并减少视频质量振荡,符合预期目标。

Existing adaptive bandwidth methods based on average quality of reception will encounter video quality oscillation in adaptive processes, and may arise disruption proble,n when the available bandwidth is highly deteriorated. Due to these problems, we present an adaptivebandwidth method which is in video fluency-priority. The method introduces the priority algorithm of graph colouring, in adaptive process of the bandwidth, it changes the average quality range by determining whether the oscillation is adjusted or not on the premise that the fluent video play is guaranteed, so as to aehieve the effect of reducing the frequency of video oscillation. Simulation results show that the method ensures the fluency and reduces the video quality oscillation while adaptively adjusting the transmission rate and effectively making use of the bandwidth, it is in line with the expectations.