有关于VOD视频点播系统的英文文献,最好基于校园网 我要做网上视频点播的论文,想知道一些这方面底层的东西,又没有...

\u6709\u5173\u4e8eVOD\u89c6\u9891\u70b9\u64ad\u7cfb\u7edf\u7684\u82f1\u6587\u6587\u7ae0\u5417

VOD(VIDEO-ON-DEMAND)SYSTEM

Video on demand (VOD) or Audio video on demand (AVOD) systems allow users to select and watch/listen to video or audio content on demand.

VOD systems either stream content through a set-top box, allowing viewing in real time, or download it to a device such as a computer, digital video recorder, personal video recorder or portable media player for viewing at any time. The majority of cable and telco based television providers offer both VOD streaming, such as pay-per-view, whereby a user buys or selects a movie or television program and it begins to play on the television set almost instantaneously, or downloading to a DVR rented from the provider, for viewing in the future.

Functionality
Download and streaming video on demand systems provide the user with a large subset of VCR functionality including pause, fast forward, fast rewind, slow forward, slow rewind, jump to previous/future frame etc. These functions are called trick modes. For disk-based streaming systems which store and stream programs from hard disk drive, trick modes require additional processing and storage on the part of the server, because separate files for fast forward and rewind must be stored. Memory-based VOD streaming systems have the advantage of being able to perform trick modes directly from RAM, which requires no additional storage or CPU cycles on the part of the processor.

It is possible to put video servers on LANs, in which case they can provide very rapid response to users. Streaming video servers can also serve a wider community via a WAN, in which case the responsiveness may be reduced. Download VOD services are practical to homes equipped with cable modems or DSL connections. Servers for traditional cable and telco VOD services are usually placed at the cable head-end serving a particular market as well as cable hubs in larger markets. In the telco world, they are placed in either the central office, or a newly created location called a Video Head-End Office (VHO).


[edit] In-flight entertainment
Some airlines offer AVOD as in-flight entertainment to passengers through individually-controlled video screens embedded in seatbacks or armrests or offered via portable media players. Airline AVOD systems offer passengers the opportunity to select specific stored video or audio content and play it on demand including pause, fast forward, and rewind.


[edit] History
From September 1994, a VOD service formed a major part of the Cambridge Interactive TV trial[1]. This provided video and data to 250 homes and schools connected to the Cambridge Cable network (later part of NTL, now Virgin Media). The MPEG-1 encoded video was streamed over an ATM network from an ICL media server to set top boxes designed by Acorn Online Media. The trial commenced at a speed of 2 Mbit/s to the home, subsequently increased to 25 Mbit/s.[2] The content was provided by the BBC and Anglia Television. Although a technical success, difficulty in sourcing content was a major issue, and the project closed in 1996.

In 1998, Kingston Communications became the first UK company to launch a fully commercial VOD service and the first to integrate broadcast TV and Internet access through a single set-top box using IP delivery over ADSL. By 2001, Kingston Interactive TV had attracted 15,000 subscribers. After a number of trials, HomeChoice followed in 1999, but were restricted to London. After attracting 40,000 customers, they were bought by Tiscali in 2006. Cable TV providers Telewest and NTL (now Virgin Media) launched their VOD services in the United Kingdom in 2005 in attempt to snatch subscribers from the country's leading pay TV distributor BSkyB whose satellite-based network is unable to offer such a service. BSkyB responded by launching Sky by broadband, which was later renamed Sky Anytime on PC. The service went live on 2 January 2006. Sky Anytime on PC uses a legal peer-to-peer approach, based on Kontiki technology, to provide very high capacity multi-point downloads of the video content. Instead of the video content all being downloaded from Sky's servers, the content comes from multiple users of the system who have already downloaded the same content. Other UK TV broadcasters have implemented their own versions of the same technology, such as the BBC's iPlayer, which launches on 25 December 2007, and Channel 4's 4oD (4 On Demand) which launched in late 2006. The BBC, ITV and Channel 4 plan to launch a joint platform provisionally called Kangaroo in 2008.[3]

VOD services were first offered in Hawaii by Oceanic Cable in January 2000[citation needed], but are now available in all parts of the United States. Streaming VOD systems are available from cable providers (in tandem with cable modem technology) who use the large downstream bandwidth present on cable systems to deliver movies and television shows to end users, who can typically pause, fast-forward, and rewind VOD movies due to the low latency and random-access nature of cable technology. The large distribution of a single signal makes streaming VOD impractical for most satellite TV systems; however, EchoStar recently announced a plan to offer video on demand programming to PVR-owning subscribers of its Dish Network satellite TV service. After the programs are automatically recorded on a user's PVR, he or she can watch, play, pause, and seek at their convenience. VOD is also quite common in more expensive hotels. VOD systems that store and provide a user interface for content downloaded directly from the Internet are widely available.

According to the European Audiovisual Observatory, 142 paying VoD services were operational in Europe at the end of 2006. Since the start of 2008 virgin media have significantly increased their ondemand content,


[edit] Near video on demand
Near video on demand (NVOD) is a pay-per-view consumer video technique used by multi-channel broadcasters using high-bandwidth distribution mechanisms such as satellite and cable television. Multiple copies of a program are broadcast at short time intervals (typically 10\u201320 minutes) providing convenience for viewers, who can watch the program without needing to tune in at a scheduled point in time. This form is bandwidth intensive and is generally provided only by large operators with a great deal of redundant capacity and has been reduced in popularity as video on demand is implemented. Pay-per-view provider In Demand provided up to 40 channels in 2002, with several films receiving up to four channels on the staggered schedule to provide the NVOD experience; however the service now provides only six channels of content.


[edit] Push video on demand
Push video on demand is a technique used by a number of broadcaster on systems that lack the interactivity to provide true video on demand, to simulate a true video on demand system. A push VOD system uses a Personal Video Recorder (PVR) to automatically record a selection of programming, often transmitted in spare capacity overnight. Users can then watch the downloaded programming at times of their choosing. As content occupies space on the PVR hard drive, downloaded content is usually deleted after a week to make way for new programmes. The limited space on a typical PVR hard drive means that the flexibility and selection of programmes available on such systems is more restricted than true VOD systems.


[edit] List of video on demand services
Comcast
Apple iTunes Store
ReelTime.com
Google Video
Rogers
The Movie Network
Xbox 360
Movielink
CinemaNow
Vongo
ZML
Hulu
Joost
4oD
BBC iPlayer
Walmart Video Download (beta)
-----------
Much hope has been placed in the past on Educational Television for improving educational standards and distance education. However, in many countries the impact of this technology has been limited. Some of the reasons are discussed along with possible technical solutions. One solution that has been developed at HP Labs India is presented. This involves the use of satellite TV channels, using the MPEG format, as the distribution channel for educational content in digital form. Inexpensive TV equipment, including those that work with Direct To Home (DTH) TV transmissions are used to capture TV programs in digital form and store them on a server. The system is also capable of capturing text content being sent with the program in the Electronic Program Guide format as well as content in various other data formats including PDF. All captured content is stored in a digital library, offering students an on-demand video facility on campus. Easy search facilities are also offered to help find content items of interest.

\u4ee5\u4e0b\u4e66\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b1-3\u672c\u662f\u8bb2VOD\u539f\u7406\u7684
\u540e\u9762\u7684\u662f\u7f16\u7a0b\u4e0a\u7684\u3002
\u4e00\u822c\u5b66\u6821\u56fe\u4e66\u9986\u90fd\u6709\u7684

\u5f6d\u5b87\u884c\uff0c\u9648\u798f\u63a5. \u5206\u5e03\u5f0fVOD\u7cfb\u7edf\u7684\u89c6\u9891\u6570\u636e\u5b58\u50a8, \u8ba1\u7b97\u673a\u5b66\u62a5,2000

\u94b1\u7a0b\uff0c\u6768\u5b8f\uff0c\u8c0c\u660e. \u672a\u6765VOD\u7cfb\u7edf\u7684\u53d1\u5c55\u65b9\u5411\u53ca\u6280\u672f\u65b9\u6848, \u8ba1\u7b97\u673a\u5de5\u7a0b, 2001

\u6797\u5764\u8f89. \u4e00\u79cdVOD\u7cfb\u7edf\u89c6\u9891\u670d\u52a1\u5668\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0, \u8ba1\u7b97\u673a\u5de5\u7a0b, 2001 Vol.27

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\u7f16\u7a0b\u9ad8\u624b\u5de5\u4f5c\u5ba4.ASP\u7f16\u7a0b\u9ad8\u624b.\u5317\u4eac:\u5e0c\u671b\u7535\u5b50\u51fa\u7248\u793e

\u674e\u79b9\u751f,\u5218\u5175.ASP\u5b9e\u7528\u6280\u672f.\u5317\u4eac:\u4e2d\u56fd\u6c34\u5229\u6c34\u7535\u51fa\u7248\u793e

\u5218\u6d9b.\u5c0f\u578b\u7f51\u7ad9\u5efa\u8bbe\u6280\u672f.\u5317\u4eac:\u4e2d\u56fd\u94c1\u9053\u51fa\u7248\u793e

\u5f6d\u6f8e.\u8ba1\u7b97\u673a\u7f51\u7edc\u6559\u7a0b.\u5317\u4eac:\u673a\u68b0\u5de5\u4e1a\u51fa\u7248\u793e

VOD(VIDEO-ON-DEMAND)SYSTEM

Video on demand (VOD) or Audio video on demand (AVOD) systems allow users to select and watch/listen to video or audio content on demand.

VOD systems either stream content through a set-top box, allowing viewing in real time, or download it to a device such as a computer, digital video recorder, personal video recorder or portable media player for viewing at any time. The majority of cable and telco based television providers offer both VOD streaming, such as pay-per-view, whereby a user buys or selects a movie or television program and it begins to play on the television set almost instantaneously, or downloading to a DVR rented from the provider, for viewing in the future.

Functionality
Download and streaming video on demand systems provide the user with a large subset of VCR functionality including pause, fast forward, fast rewind, slow forward, slow rewind, jump to previous/future frame etc. These functions are called trick modes. For disk-based streaming systems which store and stream programs from hard disk drive, trick modes require additional processing and storage on the part of the server, because separate files for fast forward and rewind must be stored. Memory-based VOD streaming systems have the advantage of being able to perform trick modes directly from RAM, which requires no additional storage or CPU cycles on the part of the processor.

It is possible to put video servers on LANs, in which case they can provide very rapid response to users. Streaming video servers can also serve a wider community via a WAN, in which case the responsiveness may be reduced. Download VOD services are practical to homes equipped with cable modems or DSL connections. Servers for traditional cable and telco VOD services are usually placed at the cable head-end serving a particular market as well as cable hubs in larger markets. In the telco world, they are placed in either the central office, or a newly created location called a Video Head-End Office (VHO).

[edit] In-flight entertainment
Some airlines offer AVOD as in-flight entertainment to passengers through individually-controlled video screens embedded in seatbacks or armrests or offered via portable media players. Airline AVOD systems offer passengers the opportunity to select specific stored video or audio content and play it on demand including pause, fast forward, and rewind.

[edit] History
From September 1994, a VOD service formed a major part of the Cambridge Interactive TV trial[1]. This provided video and data to 250 homes and schools connected to the Cambridge Cable network (later part of NTL, now Virgin Media). The MPEG-1 encoded video was streamed over an ATM network from an ICL media server to set top boxes designed by Acorn Online Media. The trial commenced at a speed of 2 Mbit/s to the home, subsequently increased to 25 Mbit/s.[2] The content was provided by the BBC and Anglia Television. Although a technical success, difficulty in sourcing content was a major issue, and the project closed in 1996.

In 1998, Kingston Communications became the first UK company to launch a fully commercial VOD service and the first to integrate broadcast TV and Internet access through a single set-top box using IP delivery over ADSL. By 2001, Kingston Interactive TV had attracted 15,000 subscribers. After a number of trials, HomeChoice followed in 1999, but were restricted to London. After attracting 40,000 customers, they were bought by Tiscali in 2006. Cable TV providers Telewest and NTL (now Virgin Media) launched their VOD services in the United Kingdom in 2005 in attempt to snatch subscribers from the country's leading pay TV distributor BSkyB whose satellite-based network is unable to offer such a service. BSkyB responded by launching Sky by broadband, which was later renamed Sky Anytime on PC. The service went live on 2 January 2006. Sky Anytime on PC uses a legal peer-to-peer approach, based on Kontiki technology, to provide very high capacity multi-point downloads of the video content. Instead of the video content all being downloaded from Sky's servers, the content comes from multiple users of the system who have already downloaded the same content. Other UK TV broadcasters have implemented their own versions of the same technology, such as the BBC's iPlayer, which launches on 25 December 2007, and Channel 4's 4oD (4 On Demand) which launched in late 2006. The BBC, ITV and Channel 4 plan to launch a joint platform provisionally called Kangaroo in 2008.[3]

VOD services were first offered in Hawaii by Oceanic Cable in January 2000[citation needed], but are now available in all parts of the United States. Streaming VOD systems are available from cable providers (in tandem with cable modem technology) who use the large downstream bandwidth present on cable systems to deliver movies and television shows to end users, who can typically pause, fast-forward, and rewind VOD movies due to the low latency and random-access nature of cable technology. The large distribution of a single signal makes streaming VOD impractical for most satellite TV systems; however, EchoStar recently announced a plan to offer video on demand programming to PVR-owning subscribers of its Dish Network satellite TV service. After the programs are automatically recorded on a user's PVR, he or she can watch, play, pause, and seek at their convenience. VOD is also quite common in more expensive hotels. VOD systems that store and provide a user interface for content downloaded directly from the Internet are widely available.

According to the European Audiovisual Observatory, 142 paying VoD services were operational in Europe at the end of 2006. Since the start of 2008 virgin media have significantly increased their ondemand content,

[edit] Near video on demand
Near video on demand (NVOD) is a pay-per-view consumer video technique used by multi-channel broadcasters using high-bandwidth distribution mechanisms such as satellite and cable television. Multiple copies of a program are broadcast at short time intervals (typically 10–20 minutes) providing convenience for viewers, who can watch the program without needing to tune in at a scheduled point in time. This form is bandwidth intensive and is generally provided only by large operators with a great deal of redundant capacity and has been reduced in popularity as video on demand is implemented. Pay-per-view provider In Demand provided up to 40 channels in 2002, with several films receiving up to four channels on the staggered schedule to provide the NVOD experience; however the service now provides only six channels of content.

[edit] Push video on demand
Push video on demand is a technique used by a number of broadcaster on systems that lack the interactivity to provide true video on demand, to simulate a true video on demand system. A push VOD system uses a Personal Video Recorder (PVR) to automatically record a selection of programming, often transmitted in spare capacity overnight. Users can then watch the downloaded programming at times of their choosing. As content occupies space on the PVR hard drive, downloaded content is usually deleted after a week to make way for new programmes. The limited space on a typical PVR hard drive means that the flexibility and selection of programmes available on such systems is more restricted than true VOD systems.

[edit] List of video on demand services
Comcast
Apple iTunes Store
ReelTime.com
Google Video
Rogers
The Movie Network
Xbox 360
Movielink
CinemaNow
Vongo
ZML
Hulu
Joost
4oD
BBC iPlayer
Walmart Video Download (beta)
-----------
Much hope has been placed in the past on Educational Television for improving educational standards and distance education. However, in many countries the impact of this technology has been limited. Some of the reasons are discussed along with possible technical solutions. One solution that has been developed at HP Labs India is presented. This involves the use of satellite TV channels, using the MPEG format, as the distribution channel for educational content in digital form. Inexpensive TV equipment, including those that work with Direct To Home (DTH) TV transmissions are used to capture TV programs in digital form and store them on a server. The system is also capable of capturing text content being sent with the program in the Electronic Program Guide format as well as content in various other data formats including PDF. All captured content is stored in a digital library, offering students an on-demand video facility on campus. Easy search facilities are also offered to help find content items of interest.

题目1: An Overview of Interactive Video On Demand System

部分内容:
With the explosion of Internet, people have endless hype, opinions, forecasts, and beliefs about it [16]. Interactive Television, they feel, is the vision to their beliefs: people will soon be able to purchase products, view movies, play video games, browse Internet, participate video-conferences without leaving their houses [4]. Of all the new things that people can do with television, video-on-demands is highly supported by Hollywood since it can lead to new markets and can bring them unpredictable profits.

People have been passive participants in receiving what TV service providers offer since television was introduced. Interactive Video On Demand (IVOD), unlike traditional television delivery, provides users with flexibility in choosing the kinds of information they like to receive [5]. An IVOD system is capable of serving a large number of end users to concurrently access large number of repositories of stored data, often movies [14]. IVOD is basically an extension of Video On Demand (VOD). In addition to the freedom of choosing movies, users can interact with movies and decide the viewing schedule [20]. In other words, IVOD system supports VCR-like functions, such as fast forward, rewind, pause. The enormous communication bandwidth and disk bandwidth required, and the Quality of Service (QoS) demanded necessitate a careful design of the system in order to maximize the number of concurrent users while minimizing the cost.
...
...
...

全部内容见:

http://www.ece.ubc.ca/~irenek/techpaps/vod/vod.html

---------------------------------------------------------------

题目2: Video Staging: A Proxy-Server-Based Approach to End-to-End Video Delivery over Wide-Area Networks

部分内容:
Real-time distribution of stored video over wide-area networks is a crucial component of many emerging distributed multimedia applications. The heterogeneity in the underlying network environments is an important factor that must be taken into consideration when designing an end-to-end video delivery system. In this paper, we present a novel approach to the problem of end-to-end video delivery over wide-area networks using proxy servers situated between local-area networks (LANs

...
...
...

全部内容见:

http://64.233.179.104/scholar?num=50&hl=en&lr=&q=cache:mbqT91Fd8w8J:www.cs.umn.edu/Research/CNMRG/Papers/Zhan00:Video-Staging.ps+

---------------------------------------------------------------
题目3: Video on Demand

部分内容:
Video on Demand (VoD) is an interactive multimedia system that works like cable Television, the difference being that the customer can select a movie from a large video database. Individual customers in an area are able to watch different programmes when they wish to, making the system a realisation of the video rental shop brought into the home.

As the underlying technologies are relatively new, Video on Demand still lacks a universal standardisation. Nevertheless, many research institutes and commercial organisations have established de-facto standards and consequently, there are many operational VoD-related services available today. Some of the key areas of today's VoD-related applications are,

Providing Video Films on Demand
Local News and Weather Forecasting
Games, Music and Leisure
Education and Remote Learning Facilities
Home Shopping and Other Consumer Services
Banking
...
...
...

全部内容见:

http://www.doc.ic.ac.uk/~nd/surprise_95/journal/vol4/shr/report.html

vod.jluzh.com

  • 鐜板湪鍦ㄧ綉缁滀笂寰堟祦琛岀殑涓涓悕璇嶅彨鈥VOD鈥濇槸鎸囦粈涔
    绛旓細VOD (Video On Demand)鍗瑙嗛鐐规挱鎶鏈殑绠绉,涔熺О涓轰氦浜掑紡鐢佃鐐规挱绯荤粺銆傝棰戠偣鎾槸璁$畻鏈烘妧鏈佺綉缁滄妧鏈佸濯掍綋鎶鏈彂灞曠殑浜х墿,鏄竴椤瑰叏鏂扮殑淇℃伅鏈嶅姟銆傚畠鎽嗚劚浜嗕紶缁熺數瑙嗗彈鏃剁┖闄愬埗鐨勬潫缂,瑙e喅浜嗕竴涓兂鐪嬩粈涔堣妭鐩氨鐪嬩粈涔,鎯充綍鏃剁湅灏变綍鏃剁湅鐨勯棶棰樸 鏈夌嚎鐢佃瑙嗛鐐规挱,鏄寚鍒╃敤鏈夌嚎鐢佃缃戠粶,閲囩敤澶氬獟浣撴妧...
  • vod鎸囩殑鏄粈涔
    绛旓細vod鎸囩殑鏄棰戠偣鎾紙Video On Demand锛夋妧鏈傚畠鏄竴绉嶆牴鎹敤鎴疯姹傛挱鏀捐妭鐩殑瑙嗛鐐规挱绯荤粺锛屾妸鐢ㄦ埛鎵鐐瑰嚮鎴栭夋嫨鐨勮棰戝唴瀹癸紝浼犺緭缁欐墍璇锋眰鐨勭敤鎴枫倂od鎶鏈殑鍑虹幇锛屾瀬澶у湴鏀瑰彉浜嗕汉浠殑瑙傚奖涔犳儻銆備笌浼犵粺鐨勭數瑙嗘挱鏀炬ā寮忎笉鍚岋紝vod鍏佽鐢ㄦ埛鏍规嵁涓汉鍠滃ソ鍜屾椂闂村畨鎺掞紝鑷富閫夋嫨鎯宠瑙傜湅鐨勮妭鐩紝瀹炵幇浜嗕釜鎬у寲鐨勮褰变綋楠屻
  • vod鎸囩殑鏄粈涔
    绛旓細VOD鎸瑙嗛鐐规挱銆傝棰戠偣鎾槸浜屽崄涓栫邯90骞翠唬鍦ㄥ浗澶栧彂灞曡捣鏉ョ殑锛岃兘鏍规嵁鐢ㄦ埛鐨勯渶瑕佹挱鏀剧浉搴旂殑瑙嗛鑺傜洰锛鑻辨枃绉颁负Video on Demand锛屾墍浠ョ畝绉颁负VOD銆vod鎸囩殑鏄粈涔 瑙嗛鐐规挱鏄妸鐢ㄦ埛鎵鐐瑰嚮鎴栭夋嫨鐨勮棰戝唴瀹癸紝浼犺緭缁欐墍璇锋眰鐨勭敤鎴凤紝瑙嗛鐐规挱涓氬姟鏄繎骞存潵鏂板叴鐨勪紶濯掓柟寮忋傝棰戠偣鎾槸璁$畻鏈烘妧鏈佺綉缁滈氫俊鎶鏈佸濯掍綋...
  • 瑙嗛鐐规挱绠浠
    绛旓細瑙嗛鐐规挱锛圴ideo on Demand锛岀畝绉癡OD锛夋槸涓绉嶄氦浜掑紡鐢佃鏈嶅姟锛屽畠鍏佽鐢ㄦ埛鏍规嵁涓汉闇姹傞夋嫨瑙傜湅鐗瑰畾鐨勮棰戣妭鐩紝浠庤屾樉钁楁彁鍗囦簡鐢ㄦ埛鐨勮鐪嬩綋楠屻備笌浼犵粺鐢佃鐨勮鍔ㄦ帴鏀剁浉姣旓紝VOD鎻愪緵浜嗕竴绉嶆洿涓虹伒娲荤殑瑙傜湅鏂瑰紡銆傛墦寮鐢佃锛屾帴鍏ラ厭搴楁垨瀹跺涵鐨VOD绯荤粺锛岀敤鎴峰彲浠ヨ烦杩囧箍鍛婏紝涓嶅彈鑺傜洰鏃堕棿闄愬埗锛岄殢蹇冩墍娆插湴閫夋嫨鎯崇湅鐨勫唴瀹...
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