What is IPTV, and how does it actually work?

The short definition

IPTV stands for internet protocol television. It means television delivered over an internet connection using the same networking that carries web pages and video calls, rather than over a satellite dish, an aerial or a dedicated cable line.

From your point of view the difference is mostly practical: no dish, no engineer visit, no fixed box. Instead you install a player app on a device you already own and give it the details of your subscription.

How delivery differs from satellite and cable

A satellite or aerial broadcast sends the same signal to everyone in a wide area at once. Your box tunes in to the part of it you want. Because the signal is broadcast regardless of who is watching, reception depends on weather and line of sight rather than on how busy the network is.

IPTV works the other way round. When you open a channel, your player requests that specific stream and it is sent to you individually. Nothing is wasted on channels nobody is watching, which is why a very large channel list is practical. The trade-off is that the quality of your own connection now matters, because the stream has to arrive steadily rather than simply being present in the air.

What that means day to day

• Channel changes can take a second or two longer than on satellite, because a new stream has to start and fill a buffer.
• A congested home network shows up as stuttering, where satellite would show pixelation in bad weather.
• You can watch on a phone or laptop as easily as on a television, because the delivery method is the same for all of them.

Playlists, portals and what we send you

A player app needs to know two things: where the streams are, and that you are allowed to watch them. There are two common ways to express that.

An M3U playlist

An M3U file is a plain text list of channels, each with a name, an optional logo and the address of its stream. When your player is given a playlist address it downloads that list and builds the channel menu from it. The file extension is usually .m3u or .m3u8.

A portal login

Some players instead take a portal address with a separate username and password. The player asks the portal for the channel list each time it opens, which means changes to the list appear without you doing anything.

The programme guide and catch-up

An electronic programme guide, usually shortened to EPG, is the schedule data that turns a channel list into something you can browse. Without it you see channel names; with it you see what is on now, what is on next, and often a description.

Guide data is a separate download from the channel list and is larger, which is why it sometimes appears a minute or two after everything else on a first setup. Most players have a refresh option if it does not arrive.

Where the source provides catch-up, the guide also lets you open something that has already been broadcast. How far back that reaches differs from channel to channel, so it is best treated as a welcome extra rather than a fixed feature of every channel.

Why quality varies

Four things decide what you see, and only the first is set by the service:

1. The resolution the channel is broadcast at. A channel produced in HD will not become 4K on a 4K television.
2. Your connection speed. Roughly 8 Mbps per HD stream and 25 Mbps or more per 4K stream, added together for everyone watching at once.
3. Your home network. Distance from the router, wireless interference and other devices all reduce the throughput actually available.
4. Your device. Older streaming sticks and budget boxes have less decoding capacity, which shows up as stuttering on higher-resolution streams.

Honest limitations

No internet-delivered service can promise uninterrupted playback, and we do not. Streams pass across networks nobody fully controls, and the weakest link is usually inside the home rather than at the source.

Channel and library availability also changes over time and differs by region. If a particular interest matters to you, ask us about it specifically before subscribing rather than assuming a category name covers it.