具有使用MPEG-4多媒体流媒体的经验

H. Shojania, Baochun Li
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引用次数: 8

摘要

随着极低比特率MPEG-4编解码器等下一代多媒体技术的出现,高质量视频和音频的多媒体流已经成为近期的现实。MPEG-4标准提供的高压缩比和容错性保证了在短期内,通过xDSL、电缆调制解调器和3G无线网络等负担得起的互联网连接,为消费者提供丰富的内容和卓越的质量。音频和视频流应用是这些场景的核心;这些应用程序中的服务质量(QoS)支持对它们的广泛接受至关重要。据我们所知,学术界还没有现有的开源MPEG-4多媒体流应用程序,这导致使用MPEG-4流的研究成果缺乏,特别是在服务质量支持方面。在这项工作中,我们在基于ip的网络中实现了一个开源的MPEG-4多媒体流测试平台。在本文中,我们展示了我们在这样一个测试平台上获得的经验和教训。首先,我们描述了在我们的实现测试平台中使用的算法和解决方案,强调了几个关键问题。其次,通过广泛的实验,我们展示了在UDP上以不同比特率流式传输一组多媒体样本的带宽需求和数据丢失的测量,这在所有消费者操作系统的TCP/IP协议堆栈中无处不在。最后,对今后需要进一步改进的工作进行了讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experiences with MPEG-4 multimedia streaming
With the advent of next-generation multimedia technologies such as very-low bit rate MPEG-4 codec, multimedia streaming of high-quality video and audio has become a near-term reality. The high compression ratio and error resilience offered by the MPEG-4 standard promise near-term popularity for rich contents and exceptional quality to consumers over affordable Internet connections, such as xDSL, cable modem and 3G wireless networks. Audio and video streaming applications are at the center of such scenarios; and Quality-of-Service (QoS) support in such applications is critical to their widespread acceptance.To the best of our knowledge, there has been no existing open-source MPEG-4 multimedia streaming applications in the academic community, which leads to the lack of research results using MPEG-4 streaming, especially with respect to Quality-of-Service support. In this work, we have implemented an open-source MPEG-4 multimedia streaming testbed in IP-based networks. In this paper, we show our experiences and lessons learned with such a testbed. First, we describe the algorithms and solutions used in our implemention testbed, emphasizing several critical issues. Second, through extensive experiments, we demonstrate measurements of bandwidth requirements and data loss for streaming a set of multimedia samples with different bit rates over UDP, which is ubiquitously available in the TCP/IP protocol stack on all consumer operating systems. Finally, future work for further improvements is also discussed.
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