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提出一种流媒体转码服务平台设计方案,基于Windows Media智能流技术实现码流的转换和流媒体发布,同时给出基于设备唯一标识的安全认证机制,最后对系统进行运行测试。 相似文献
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Writing down spoken number words (transcoding) is an ability that is predictive of math performance and related to working memory ability. We analysed these relationships in a large sample of over 25,000 children, from kindergarten to the end of primary school, who solved transcoding items with a computer adaptive system. Furthermore, we investigated the nature of transcoding difficulty of over 300 two- and three-digit numbers. All data come from a Dutch sample, meaning that transcoding is complicated by decade-unit inversion: 24 is pronounced as ‘four-and-twenty’. Omission to invert the digits of a spoken number when writing it down is an inversion error: the incidence of these declined but did not disappear in later elementary school. Furthermore, transcoding ability mediated the relationship between visuospatial working memory and mathematics performance, a strong effect that declined with age. Inversion error making mediated this same relationship in an inverted U-shaped curve, peaking around grade 2 (8 years old). At the item level, structural characteristics related to inversion and irregular pronunciation of units and decades explained a large part of the variance in item difficulty. We conclude that number transcoding is an important ability to develop mathematical proficiency and discuss the implications of these findings. 相似文献
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The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those streams into H.264 in these applications. Unfortunately, the huge complexity keeps transcoding from being widely used in practical applications. This paper proposes an efficient transcoding architecture with a smart downscaling decoder and a fast mode decision algorithm. Using the proposed architecture, huge buffering memory space is saved and the transcoding complexity is reduced. Performance of the proposed fast mode decision algorithm is validated by experiments. 相似文献
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视频资源管理系统是一种视频资源发布和管理平台,它直接面向广大用户提供视频资源共享服务和视频资源长期保存服务。清华大学图书馆设计并应用了视频资源管理系统,主要功能模块包括视频资源上传、元数据编目、转码、发布、保存和权限管理等。视频内容包括学生原创作品、名人名师讲座、人文课程以及图书馆原创视频等,采取分角色权限控制,分部门资源管理、特色资源独立呈现、统一保存等方式,应用以来取得良好效果。在设计和应用视频资源管理系统过程中,应对视频类多媒体资源及其元数据有清晰的认识,要充分发挥资源管理系统的优势,有效整合、发布、分享和保存珍贵视频资源。 相似文献
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数字媒体视频转码技术研究 总被引：1，自引：0，他引：1
本文针对视频转码技术的几个关键点展开分析,主要包括视频转码的体系结构和关键技术等方面,介绍了现有的几种算法,分析和总结了各自的特点,同时对转码技术的研究方向也进行了讨论。 相似文献
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结合空时OFDM和转换编码技术,提出了一种无线衰落信道下具有可分级转码能力的鲁棒视频传输方法.采用可分级转码器将高质量的MPEG-2压缩视频转换为低码率、低分辨率MPEG-4可分级码流来满足网络带宽和终端设备显示的要求.在接收端采用一种层干扰抑制算法,使得分层空时OFDM系统不同层的传输性能存在差异,从而使系统具有不对等保护能力.根据分级码流的重要程度不同,将转码输出的可分级码流分别由分层空时编码OFDM系统的不同层来实现视频的鲁棒传输.实验结果表明:在典型的随机突发错误的无线环境下,提出的具有可分级转码能力的系统的视频传输性能优于传统的非分级转码的视频传输系统. 相似文献
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Sports video appeals to large audiences due to its high commercial potentials. Automatically extracting useful semantic information and generating highlight summary from sports video to facilitate users‘ accessing requirements is an important problem, especially in the forthcoming broadband mobile communication and the need for users to access their multimedia information of interest from anywhere at anytime with their most convenient digital equipments. In this paper, a system to generate highlight summaries oriented for mobile applications is introduced, which includes highlight extraction and video adaptation. In this system, several highlight extraction techniques are provided for field sports video and racket sports video by using multi-modal information. To enhance users‘ viewing experience and save bandwidth, 3D animation from highlight segment is also generated. As an important procedure to make video analysis results universally applicable, video transcoding techniques are applied to adapt the video for mobile communication environment and user preference. Experimental results are encouraging and show the advantage and feasibility of the system for multimedia content personalization, enhancement and adaptation to meet different user preference and network/device requirements. 相似文献
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3G移动监控平台目前缺乏统一的应用标准,设计移动监控系统的通用应用框架,并实现移动监控系统实例,验证了3G平台的移动监控方案可行性。 相似文献
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随着互联网和手机网络的不断发展,媒体传播的平台越来越多,相应传播平台支持的媒体格式也越来越多。不同平台对内容格式的要求不完全相同,其中包括编码格式/规格、分辨率、帧率等参数的变化,对多媒体内容格式进行转换变得必不可少,而FFmpeg开源组件为音视频转换提供了强大的支持。详细分析了基于FFmpeg开源组件视频自动批量转码的实现。 相似文献
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孙红 《天津成人高等学校联合学报》2014,(8):45-47
随着校园信息化的深入,校园用户对视频内容的需求日益增加,现有的校园内容平台已经不能满足这一需求。直播电视内容编转码后引入校园是缓解该供需矛盾最为有效的方法之一。通过直播电视内容编转码平台与校园现有内容平台的融合,增强校园网络传输能力,开发适合多种接入设备客户端软件等工作的分解实施,该项目必然在未来的校园整体视频服务项目的发展中起到基础核心作用。 相似文献
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