IPTVProviding Television Over IP Networks - Tulika Roll No. 06ESBEC108 B.Tech. VIIIthsem(ECE)
Introduction to IPTV Internet Protocol (IP): specifies the format of packets and the addressing scheme. The protocol establishes a virtual connection between a destination and a source. Television (TV): specifies the medium of communication that operates through the transmission of pictures and sounds. IP+TV=IPTV IPTV:specifies the medium of communication of pictures and sound that operates over an IP Network.
Types of video-server architecure:Centralized-simple and easy to manage-provides small VOD service deployment-efficient content delivery networkDistributed- manages a large server network-requires intelligent and sophisticated content distribution technology
IMS architecture for IPTV for supporting IPTV services in carriers networks carriers will be able to offer both voice and IPTV services over the same core infrastructure implementation of services by combining conventional TV services with telephony features (e.g. caller ID on the TV screen)
Key Components Video Encoders - responsible for transforming an input stream into a digital compressed stream. - responsible to encapsulate the video streams into a transport format that can be IP packets. - technical key attributes of video encoders are quality of the encoding, compression rate, variety of encoding algorithms, and support for statistical multiplexing. - Some video encoder suppliers are Harmonic, Tandberg, Thales, and Tut Systems.
H.264 Up to 50% in bit rate savings: Compared to H.263v2 (H.263+) or MPEG-4 a reduction in bit rate by up to 50% for a similar degree of encoder optimization at most bit rates.
High quality video: consistently good video quality at high and low bit rates.
Error resilience: provides tools necessary to deal with packet loss and bit errors
- Network friendliness: H.264 bit streams can be easily transported over different networks.
Video Server - computer-based devices connected to large storage systems. - Content is stored either on disk or in large banks of RAM. - technical key attributes of video servers are scalability in terms of storage and number of streams, management software, and variety of interfaces. - Some video server suppliers are Bitband, Broadbus, C-COR, Entone, and Kasenna
Middleware -software and hardware infrastructure that connects the components of an IPTV. - distributed operating system that runs both on servers and on the STBs. - performs end-to-end configuration links with the content - ensures that all STBs run compatible software - technical key attributes are reliability, scalability, and ability to interface with other systems. - Some middleware suppliers are Microsoft, Myrio/Siemens, Minerva, Orca, and Thales.
Conditional Access System/Digital Rights Management - A conditional access system (CAS) allows for the protection of content. - controls the real-time viewing, but also what happens to the content after it has been viewed once. - Some CAS/DRM suppliers are Irdeto, Microsoft, Verimatrix, and Widewine
STB /Terminal- - responsible for interface with the user, its television and the network. - transforms a digital compressed signal into a signal that is sent to the TV. - technical key attributes of a STB are reliability, decoder support, size of internal drive, and variety of external interface -Some STB suppliers are Amino, Motorola, and Scientific Atlanta.
Working -Gathers content from a variety of sources. -head end is converting the media sources into a new form -asset management is designed to store, move and send out (play) the media at scheduled times. -distribution system simultaneously transfers multiple channels to users who are connected to the IPTV system. Each user can view IPTV programming on analog televisions .
Processing stages of information in IPTV network IP video system digitizes and eventually reformats the original video encodes and/or compresses the data,adds IP address information to each packet. transfers the packets through a packet data network. recombines the packets and extracts the digitized video decodes the data and converts the digital video back into its original video form.
IPTV- Key Protocols HTTP RTSP IGMP Request Firefox, Internet Explorer (hyper-text- transfer-protocol) Response play -Used by VoD and NPVR Real Player, Windows Media Player (streamed video) pause (real time streaming protocol) record
Difference between IPTV & INTERNET TV IPTV Multicast technologies for broadcasting. Better QOS to deliver the video to the consumer with minimal interruptions. DRM is standard, with operators providing high levels of video asset management and encryption. Delivery of content is device specific. Provisioning, billing and customer service methods are the same as traditional TV platforms. INTERNET TV
Channels are streamed using unicast technologies.
No end-to-end bandwidth provisioning as operators cannot control the networks - as a result QOS is limited.
Delivery of video can be encrypted, and DRM can be used, but is not always adopted. Networks are not fully managed. Customer service is largely online and customer management is much less developed.
Integration Web Service& Un-interrupted Transmission Switched IP Advantages Better compression & Control Over Functionality Interactivity Home network & VOD
Packet Loss Bandwidth Restriction Jitter Currently no support for HDTV Impulse noise Limitations
Distant Education Electronic Government Corporate Training Usages TV & Entertainment Seminars & Conferences Internal Marketing
Conclusion IPTV seems to have a bright future as the telephone, the computer, and the TV can be run by the same company through the same network, computer-savvy people will be more likely to opt for IPTV, the coming years residential IPTV is expected to grow at a brisk pace IPTV is yet to pick up in India. However, if the IPTV companies can prove to their potential customers that IPTV is more advantageous than the cable service or the now popular DTH service, IPTV is likely to become a huge hit in the country. IPTV will change television - viewers will decide when, where andhow to enjoy it