Proxy caching mechanisms with video quality adjustment
Proxy caching mechanisms with video quality adjustment
复制标题
带视频质量调整的代理缓存机制
DOI：
10.1117/12.434278
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
H. Miyahara
中科院分区：
文献类型：
--
作者：
Masahiro Sasabe;N. Wakamiya;M. Murata;H. Miyahara
WWW系统中广泛使用的代理机制通过"代理服务器“提供低延迟的数据传送。通过将代理机制应用到视频传输中，我们期望在不引入额外负载的情况下实现实时和交互式的视频流。此外，如果代理根据用户的需求适当调整缓存视频数据的质量，则可以考虑用户的异构QoS要求将视频流交付给用户。在本文中，我们提出了代理缓存机制，可以实现高质量的视频传输考虑用户的需求和可用带宽。在我们的系统中，视频流被分成多个片段。代理服务器将视频缓存到本地缓存中，根据需要调整视频质量，传输给用户，替换为缓存数据，并根据用户的需求从视频服务器中检索。我们评估所提出的视频缓存机制，并比较它们的性能所需的缓冲区大小，播放延迟和视频质量。因此，确认了代理中的视频质量调整的有效性。
The proxy mechanisms widely used in WWW systems offer low-delay data delivery by a means of ``proxy server''. By applying the proxy mechanism to the video transfer, we expect a real-time and interactive video streaming without introducing extra load on the system. In addition, if the proxy appropriately adjusts the quality of cached video data to the user's demand, video streams can be delivered to users considering their heterogeneous QoS requirements. In this paper, we propose proxy caching mechanisms that can achieve a high-quality video transfer considering the user's demand and the available bandwidth. In our system, a video stream is divided into pieces. The proxy caches them in local buffer, adjusts their quality if necessary, transmits them to users, replaces them with cached data, and retrieves them from the video server, considering user's requirement. We evaluate the proposed video caching mechanisms and compare their performance in terms of the required buffer size, the play-out delay and the video quality. Consequently, the validity of the video quality adjustment in the proxy is confirmed.