What is the difference between VoD and IPTV?

Internet Protocol television (IPTV) is the delivery of television content over Internet Protocol (IP) networks. This is in contrast to delivery through traditional terrestrial, satellite, and cable television formats. Unlike downloaded media, IPTV offers the ability to stream the source media continuously. As a result, a client media player can begin playing the content (such as a TV channel) almost immediately. This is known as streaming media.

Although IPTV Service uses the Internet protocol it is not limited to television streamed from the Internet, (Internet television). IPTV is widely deployed in subscriber-based telecommunications networks with high-speed access channels into end-user premises via set-top boxes or other customer-premises equipment. IPTV is also used for media delivery around corporate and private networks. IPTV in the telecommunications arena is notable for its ongoing standardization process (e.g., European Telecommunications Standards Institute).

What is Video on Demand (VoD)?

Video on Demand (VoD) allows users to select and watch/listen to video or audio content on demand. It goes hand in hand with IPTV in that you can watch digital television over the internet, but VoD has that 'demand' factor to it, letting you watch a program whenever it suits you. Some examples of video on demand services include Apple TV and Telstra T-Box.

Streaming media content is delivered either as IPTV, or VoD.

What are the differences between IPTV/VoD and conventional TV?

In a word: control. IPTV is based on a two-way protocol, gives the user greater interactivity with the medium and the content. The provider can better meet the wishes of the user, who has influence over the programs and timing. IPTV is the engine that will drive the new era of interactive content. The success or failure of operators – free and pay – will depend on them being ahead of the game with the new technologies, content formats and business models IPTV ushers in.

The ‘trick play’ functions of pause, rewind and fast forward that we find on DVRs are available using IPTV. This does not allow us to change the content, only how we control the viewing and when we view it. At the next level, IPTV features also allow you to ‘touch’ the program content, perhaps by ordering a product being advertised or voting on a reality TV show via your remote control. In its most sophisticated form, IPTV will immerse you in the program – the content itself being changed by viewer input.

IPTV services may be classified into three main groups:

· Live television and live media, with or without related interactivity;

· Time-shifted media: e.g. catch-up TV (replays a TV show that was broadcast hours or days ago), start-over TV (replays the current TV show from its beginning);

· Video on demand (VOD): browse and view items in a stored media catalog.

Therefore, the general IPTV service will have live TV and video on demand, while the more advanced IPTV service will also have a catch-up function, which will enable you to have a good performance.

Converged services and other features

The most exciting advantage of IPTV is in converged services. Many of us have a smartphone, such as Apple’s iPhone, which enables us to make calls, synchronize contacts and calendars, and use email. Converged services on television enable us to watch programs, read email, answer the phone, check local weather, look at fuel prices, order food, browse the Internet, or plan a trip and then download it to a GPS device. Convergence for television also means we have more variety of content, which can be from YouTube, RooMedia, ABC online, NineMSN – or any of the multitudes of online sources that provide short-play videos.

Another simpler advantage of IPTV is reliability. Because IPTV streams are delivered over the internet, they aren't dependent on the weather like terrestrial TV (i.e. digital or analogue TV). Of course, if you have an unreliable internet connection you may have problems.

IPTV also provides additional features, and can easily allow interactive viewing or scheduled recording to take place. Because the delivery doesn't depend on a license to broadcast using radio frequencies, IPTV also provides access to a far greater diversity of channels and programming.

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