分布式VOD系统的视频数据存储

以降低视频服务损失率为目标研究分布式ＶＯＤ系统视频文件的存储策略,并给出了分布式视频服务器的视频文件存储方法。     

昆腾为客户降低工作负载存储的复杂性

昆腾公司近日宣布推出获得全球领先的开放式平台IP视频管理软件(VMS)提供商Milestone Systems认证的视频监控解决方案。昆腾StorN ext横向扩展存储能够与Milestone XProtect VMS一同使用并已获得认证,从而提供一个可存储大量视频文件同时优化系统性能的整合解决方案。它提高了性能与可扩展性的标准,并为视频监控负载提供标准、易于使用的存储功能。这个整合解决方案让Milestone用户能够同时     

一种分布式视频系统中多级存储模型研究

本文提出的分布式视频系统中一种多级存储模型,它将计算机系统中的缓存概念应用于网络信息服务系统中.中央档案服务器(AS)作为一种后备视频库的方式存在,它的优点是存储费用低,但是它的速度较慢,并不能直接为用户提供服务.直接为用户服务的是接近用户的视频文件服务器(VFS),由于视频文件服务器接近用户终端,可以处于一个高速的网络中.因此能够为用户提供廉价的视频服务.AS、VFS、客户终端共同组成了多级存储结构.     

基于文件分割的二进制大对象存取算法

海量媒体数据存储系统中,文件过大或多用户并发访问等原因会造成二进制大对象(BLOB)存储过程失效。为提高存储系统存取非结构二进制文件的可靠性和稳定性,提出并建立了BLOB存储可靠性概率模型,证明了使用数量较多的文件分块和较小的分块大小,可提高BLOB存储成功的概率。根据该模型,改进了关系数据库存储环境下的BLOB数据存取技术。通过建立基于文件分块的存储结构,提出了BLOB数据分块存储和重新装配新算法并进行了仿真实验。BLOB存取算法的仿真实验和实际应用表明,该存取算法有效降低了媒体数据存储失效的概率。     

视频转换大肚罗汉——All Video Joiner

大家可能收集了许多视频文件，但由于视频文件格式众多，要想将其合并起来会很麻烦。因为一般的软件只能合并同类型的视频文件，对于不同格式的视频文件无法合并，如果非要进行合并就必须先把不同格式的文件全部转换成同一格式后才可以进行，实在是非常麻烦。有了All Video Joiner这款软件就能轻松地解决这个难题，它是个“大肚汉”，可以把多个不同格式的视频文件合并到一个大的视频文件中，包容性极强。例如它可以将几个AVI视频、MPEG视频或者ASF视频合并在一起，方便我们保存和观看。     

基于集群的VOD系统视频服务器的负载均衡算法改进

文章针对VOD视频服务中不同的点播方式和视频文件存储调度的特点等问题,改进了三种负载均衡算法-加权最少连接算法、视频服务节点负载排名算法以及视濒文件播放信息算法。     

大文件分块上传和下载软件的设计与实现

针对大文件在网络存储过程中可能存在的上传和下载失败问题,提出了一种利用数据库进行分块存储和管理较大文件的方法。将一个较大的文件分割成多块,分别对分割后的每一块进行上传或下载,从而避免了网络因素对直接上传和下载较大文件所产生的影响。测试表明,通过所提出的分块与合并方法,可以有效地避免文件上传和下载过程中可能出现的失败问题,提高了上传和下载的效率。     

将在外不受君命——SONY VRD—VC10

在视频录制与编辑领域，大容量存储是一个很重要的问题，主要原因是高画质或压缩率较低的视频文件体积很大，即使是海量硬盘也很容易被填满。在这种情况下，DVD刻录的优势就体现出来了。大多数DVD刻录机需要与电脑主机连接才能工作，这肯定让一些用户感到束缚与不便。     

一种分布式并行VOD系统

给出了一种分布式并行VOD系统的体系结构 ,重点描述了其进程体系结构 ,讨论了视频文件分布式存储所涉及的两个主要问题 :如何分块和如何放置 ;最后讨论系统的容错策略。     

多路音视频文件的存储与回放

提出了一种实现多路音视频文件的存储和回放的方法。该方法可将多路音频和视频存储到同一文件中并同步回放，具有成本低、存储简单、易于控制、可扩展性强的特点，可用于视频会议、实时教学等多个方面。     

Augmented AVI video file for road surveying

This paper presents a novel video augmentation approach: a video recording of a real entity augmented by structured data. This augmented video is a self-contained entity integrating values of perceptible and non-perceptible attributes of the same real entity. It simplifies data search, storage and management. Streaming, sharing, collaboration and synchronization are also simplified by the fact that the structured data (so-called augmented data) are integrated in the video file and therefore only one file needs to be manipulated. Our approach was applied to address the issues which road engineers experience while using the ROad Measurement and Data Acquisition System (ROMDAS). The ROMDAS system collects and analyses the road-condition state through video recordings and the data corresponding acquired by specific measuring devices. Currently, however, road engineers have to search the videos manually in order to find details of interest provided by the analysis of the data measured due to the separation of the video from the data. The ROMDAS system manages a large collection of road-condition data. It does not offer history management of video recordings of the same road captured at different time. We present this hybrid video augmentation system: the Augmented Video stream Framework (AVF). It allows creation, search, history management and playback of such augmented video files for effective road surveying based on the discrete data recorded in parallel to the video recordings. The AVF provides road engineers with effective and more comfortable perceptible and non-perceptible data search, storage and history management to be used for (collaborative) road inspection and maintenance.     

The video capture method base on DIrectShow

A method of using DirectShow to implement the video captures and storage was described in this paper.During his research,the author used this mdthod to solve the problem of video capture,compress and storage on different video card.At the same time,this technology also can be used at the video process of TV,Network bradcast,DVD,So it has brad application field.     

基于DirectShow实现视频图像捕捉的方法

本文讲述了利用DirectShow技术实现现场视频图像的捕捉和存储方案，作者在实际的课题研究中，通过DiectShow技术解决了在不同视频卡上实现视频图像信号的采集，压缩和存储，同时该技术还可广泛适用于电视，网络广播等媒体信号的捕捉处理，具有广泛的应用范围。     

Measurement and enhancement of BitTorrent-based video file swarming

BitTorrent, the most popular P2P file sharing application over the Internet, has also been widely used for video file distribution, albeit in a download-and-play mode. In this paper, we extensively examine the characteristics of BT swarms with different contents through a large-scale measurement. Our study especially focuses on the existing video file swarms, trying to understand the potentials and challenges of providing streaming service in BitTorrent. Our results from intra-swarm, inter-swarm and AS-level measurements demonstrate that the video file swarms in the BitTorrent system are quite different from the non-video swarms. In particular, the preference bias terminates the long-term relationship between peers and raises a significant challenge to develop BT based streaming service. Fortunately, we find that most peer sets in video file swarms are good enough to support streaming service. Strong relationship between video file swarms is also observed from the inter-swarm measurement. This inter-swarm relationship can provide extra peer information for video file swarms. Therefore, the organization of existing peer information could be the key to mitigate the preference bias. To this end, a hypercomplex based virtual channel mechanism is proposed. We find that, quaternions can provide efficient and meaningful approximation in the bitfield operations. Using quaternion based three space rotation, our approach can help peers to avoid preference bias during the data delivery. This is especially helpful at the beginning of the downloading since the peer only has few local pieces. More importantly, this mechanism is transparent and friendly to the existing BT swarms with both video and non-video contents.     

Scheduled video delivery-a scalable on-demand video delivery scheme

Continuous media, such as digital movies, video clips, and music, are becoming an increasingly common way to convey information, entertain and educate people. However, limited system and network resources have delayed the widespread usage of continuous media. Most existing on-demand services are not scalable for a large content repository. In this paper, we propose a scalable and inexpensive video delivery scheme, named Scheduled Video Delivery (SVD). In the SVD scheme, users submit requests with a specified start time. Incentives are provided so that users will specify the start times that reflect their real needs. The SVD system combines requests to form the multicasting groups and schedules these groups to meet the deadline. SVD scheduling has a different objective from many existing scheduling schemes. Its focus has been shifted from minimizing the waiting time toward meeting deadlines and at the same time combining requests to form multicasting groups. SVD compliments most existing video delivery schemes as it can be combined with them. It requires much less resources than other schemes. Simulation study for the SVD performance and the comparison to other schemes are presented.     

流媒体视频存储服务器设计与研究

详细分析了在视频监控系统中流媒体视频存储服务器的作用和功能,针对传统的流媒体定时长存储方式的不足提出了"固定空间存储"的新策略.该存储策略将总空间初始化为多个固定大小的数据文件,每个数据文件中存储的流媒体时长可能是不相同的.针对新存储策略下出现的"1秒尾巴","事件尾巴"等新问题,提出了解决方案."固定空间存储"策略虽然增加了索引的复杂度,但是有效避免了磁盘碎片的产生,对于改善流媒体视频存储服务器性能具有重要作用.     

基于云计算的视频取证监控系统*

在视频取证过程中,面对多摄像头非协作工作方式的视频取证的缺陷以及海量的视频数据和复杂的取证计算问题,提出了一种基于云计算的视频取证监控系统的解决方案。在该方案中,各摄像头采用协作工作方式,监控系统中的视频数据保存在云计算系统中,终端用户需要的视频监控服务由云计算平台来提供,取证过程中的目标识别和跟踪等复杂计算也由云计算平台提供。该系统可以充分利用云计算平台的虚拟存储和虚拟计算能力,解决取证现场的多摄像头的协作工作能力,提高视频取证的处理效率和取证的准确性以及提高各种终端用户的监控灵活性和方便性。     

视频数据的存储调度优化策略

文章论述了采用多个代理服务器的视频点播系统中负载平衡的基本原理,指出了现有动态均衡解决方案存在的问题,各节点机的负载评价问题和任务迁移的抖动问题,进一步分析了负载接入量和接入许可问题,以及文件存储的静态调整技术.同时提出了以节目点播概率为参数,周期性调整系统中的节目文件存储,以便使用户的点播请求合理分配到各视频服务器,从而实现整个系统的负载均衡的基于点播率的存储动态调整算法.     

支持视频标签的网络视频监控系统

采用TI公司的TMS320C6713型号DSP开发板和三星公司的2410开发板设计了一个嵌入式网络视频监控系统.实时视频监控数据量多,压缩的计算量较大,采用DSP进行压缩可以发挥其速度快的特点.为了方便视频数据的传输和存储,实现监控系统的网络化,在ARM上移植嵌入式Linux来满足要求.同时该系统在客户端支持对视频数据的检索,用户可以快速找到自己想要观看的视频点,不必去浏览整个视频文件.     

基于eCryptfs的多用户加密文件系统设计和实现

加密文件系统eCryptfs能有效防止存储介质在丢失或失窃情况下导致的信息泄露隐患。它的不足在于：不支持多用户环境下的联机数据保护,即一个用户一旦成功授权访问加密文件系统中的数据,则系统中的其他用户都可以访问加密文件系统中的数据。提出了以密钥为权能的加密文件系统访问控制机制,并基于eCryptfs设计和实现了多用户加密文件系统,确保只有拥有合法密钥的用户才能访问密文数据。