Abstract
Recently, they had grown in frequency of use of video contents over the network due to the popularization of a lot of mobile devices. Then, video contents distribution methods using caching had been studied to realize more highly efficient video contents delivery. However, in a video management scheme using hierarchical data, if a calculating method of priority order uses the frequency of use, there were some problems of decreasing the efficiency of video contents management (VCM) because of the condition of decoding scalable data in which high quality data (H) absolutely requires low quality data (L). Then, this paper proposed a VCM method (m2) in consideration of the condition of usage quality. It adds the frequency itself and the high frequency for the priority value of low quality data. A quality-independent VCM method (m1) as the previous method, and order-shift method (m3) as low-quality-weighted VCM method were used. Moreover, the improved methods (m1', m2', m3') were defined respectively to reduce transmission data of each quality. We considered the effectivity of the proposed method for the condition of usage quality. We also compared the effectiveness of each method for data size of L and H. By the experimental results, we could confirm that m2' was the most effective, and that it was also important to consider both the quality-dependency condition and the data size. Next, a second caching method was used and we considered the effect of each method in variety of quality use. It was indicated that proposed method was the most effective if the usage quality was changed.
