Research of multimedia integrated broadcast method base on application of unused bandwidth by compression variances

在视频压缩中，所需的带宽根据场景的特性而不同。当可用带宽像无线电广播一样恒定时，即使执行缓冲，也会留下无用的时区。本文研究了这种非流类型数据的利用方法和调度算法。本研究的目的在于找出最佳的多媒体广播排程演算法，并提供实际应用。我们从这些观点开始研究。首先，我们测量了各种视频的最大带宽和平均带宽，并观察了左频带是如何出现的。我们研究了无用带缓冲延迟与必要带平滑延迟之间的关系，并找出了它们的特性。接下来，如果将轮播型数据广播假设为利用流型数据广播的未使用频带，则我们研究 关于我们 选择最优广播调度，以与所提供的频带平坦时的最优调度进行比较。结果表明，当提供平坦带宽时，所使用的调度方法应该从最优调度改变。此外，还有一个问题，即当视频服务器输出广播数据时，不清楚无用带宽被压缩到多少。我们研究了两种解决方案。一种是在视频传输定时时仅延迟1个测量单位的方法。通过这种方法可以正确地测量未使用的带宽。另一种方法是根据过去所需带宽的变化来预测下一个定时所需带宽的方法。当前者的方法用于单向图像输出，如运动继电器，它可以判断，1个测量时间单位的延迟是不是大问题。当后一种方法用于所需带宽波动较大的视频传输时，预测带宽的估计误差较大。但是，当带宽变化不大时，如会议，预测是比较准确的，适合于实际使用。作为一个应用实例，本文以多媒体记录的处理为例，研究了一个应用程序的保护方法。少

In video compression, the necessary bandwidth differs depend upon characteristics of the scene. When an available bandwidth is constant like radio broadcasting, useless time zones are left, even if it performs buffering. This useless bandwidth is applicable to carousel-type data broadcasting, on demand broadcasting and so on. We researched the utilization method of this non-stream type data and the scheduling algorism. The goal of the research was to discover the optimal multi-media broadcast scheduling algorithm and to offer the practical use. We started research from these viewpoints. At first, we measured the maximum bandwidth and the average bandwidth with various videos, and observed how to occur the left band. We examined the relationship of the delay by buffering of useless band between the smoothing of necessary band, and found out the characteristic. Next, if carousel type data broadcasting was assumed as a usage of the unused band with stream type data broadcasting, we resear … More ched optimal broadcast scheduling to compare with the optimal scheduling when supplied band is flat. As a result, it is cleared that used scheduling method should be changed from the optimal scheduling when flat band size is supplied. In addition, there was an issue that a useless bandwidth was unclear how much it was compressed to when the video server output broadcast data. We examined two methods for this solution. One is the method of delaying only 1 measurement unit at the time of video transmission timing. The unused bandwidth is correctly measurable by this method. Another is the method of predicting the required bandwidth of the following timing from change of the past required bandwidth. When the method of former is used for unidirectional image output like sport relay, it could judge that the delay of 1 measurement time unit is not big problem. When the method of latter is used for the transmission of the video with a large fluctuation of required bandwidth, the estimate error of predicted bandwidth is large. However, when there is little change of bandwidth like a meeting, the prediction is comparatively accurate and suitable for practical use. As an applied example, I took up manipulation of multi-Media record for an example and examined a protect method of an application. Less