26-05-2012, 05:45 PM
VEDIO SERVER
[attachment=23242]
INTRODUTION
A video server is a computer based device (also called a 'host') dedicated to delivering video.
Unlike personal computers, being multi-application devices, a video server is designed for one purpose; provisioning video, often for broadcasters. A professional grade video server records, stores, and plays back multiple streams of video without any degradation in the video signal. Broadcast quality video servers often store hundreds of hours of compressed audio and video (in different codecs), play out multiple and synchronised simultaneous streams of video, and offer quality interfaces such as SDI for digital video and XLR for balanced analog audio or AES/EBU digital audio and also Time Code. A genlock input is usually provided to provide a means of synchronizing with the house reference clock, thereby avoiding the need for timebase correction and frame synchronization.
Video servers usually offer some type of control interface allowing them to be driven by more sophisticated scheduling or play-listing applications. Popular protocols include VDCP and 9-Pin Protocol.
They can optionally allow recording using the same codec that is used in various editing software packages to prevent any wasted time in transcoding.
• Reduces the playback equipment required, reduces tape consumption, and permits more efficient use of human resources
• Reshaped the way program segments are stored and played.
BASIC ARCHITECTURE
The basic vedio server architecture consist of three element-
• Multiple hard disk drive system
• Capable of fast and simultaneous data access.
• A disk array controller.
• Fast data communication interface
• Among disk derive s and network.
• Very fast CPUs , multiple CPUs and buses , and routing switchers.
• Interfaces may also include data compression incoding deconding.
• A operating system
• Capable of handling multiple digital audio / or video streams
• Ensure correct file management and easy access.
Functionality
The customer can call on a range of services. While watching movies, performing operations such as video selection, pause, rewinding etc. can be selected as if it were a video player. These are processed by the set-top-box and sent to the local server. The local server processes the request if possible, otherwise it relays the request to a video archive server, much as a hierarchy system. Digital video/audio can be compressed
and stored on hard disk and advertised for users on the network. Multiple archive servers can simultaneously be running over the network, depending on the bandwidth available.
ARCHITECTURE OF VIDEO SERVER NETWORK A
Depending on the network architecture of the service provider, there are two main types of video server architectures that can be considered for deployment, broadcast automation and centralcasting.
The centralcasting architecture model is a relatively simple and easy to manage solution. For example, as all contents are stored in centralized servers, it does not require a comprehensive content distribution system. Centralized architecture is generally good for a network that provides relatively small VOD service deployment, has adequate core and edge bandwidth and has an efficient content delivery network (CDN).
[attachment=23242]
INTRODUTION
A video server is a computer based device (also called a 'host') dedicated to delivering video.
Unlike personal computers, being multi-application devices, a video server is designed for one purpose; provisioning video, often for broadcasters. A professional grade video server records, stores, and plays back multiple streams of video without any degradation in the video signal. Broadcast quality video servers often store hundreds of hours of compressed audio and video (in different codecs), play out multiple and synchronised simultaneous streams of video, and offer quality interfaces such as SDI for digital video and XLR for balanced analog audio or AES/EBU digital audio and also Time Code. A genlock input is usually provided to provide a means of synchronizing with the house reference clock, thereby avoiding the need for timebase correction and frame synchronization.
Video servers usually offer some type of control interface allowing them to be driven by more sophisticated scheduling or play-listing applications. Popular protocols include VDCP and 9-Pin Protocol.
They can optionally allow recording using the same codec that is used in various editing software packages to prevent any wasted time in transcoding.
• Reduces the playback equipment required, reduces tape consumption, and permits more efficient use of human resources
• Reshaped the way program segments are stored and played.
BASIC ARCHITECTURE
The basic vedio server architecture consist of three element-
• Multiple hard disk drive system
• Capable of fast and simultaneous data access.
• A disk array controller.
• Fast data communication interface
• Among disk derive s and network.
• Very fast CPUs , multiple CPUs and buses , and routing switchers.
• Interfaces may also include data compression incoding deconding.
• A operating system
• Capable of handling multiple digital audio / or video streams
• Ensure correct file management and easy access.
Functionality
The customer can call on a range of services. While watching movies, performing operations such as video selection, pause, rewinding etc. can be selected as if it were a video player. These are processed by the set-top-box and sent to the local server. The local server processes the request if possible, otherwise it relays the request to a video archive server, much as a hierarchy system. Digital video/audio can be compressed
and stored on hard disk and advertised for users on the network. Multiple archive servers can simultaneously be running over the network, depending on the bandwidth available.
ARCHITECTURE OF VIDEO SERVER NETWORK A
Depending on the network architecture of the service provider, there are two main types of video server architectures that can be considered for deployment, broadcast automation and centralcasting.
The centralcasting architecture model is a relatively simple and easy to manage solution. For example, as all contents are stored in centralized servers, it does not require a comprehensive content distribution system. Centralized architecture is generally good for a network that provides relatively small VOD service deployment, has adequate core and edge bandwidth and has an efficient content delivery network (CDN).