What is IPTV, and how does it work?

The short version

Traditional television arrives as a broadcast signal: a dish picks it up from a satellite, or a cable carries it into the house. IPTV sends the same kind of content as data over your internet connection, in the same way a video streaming app does.

The practical consequence is that no new cabling or hardware is needed. If a device can run a video app and reach the internet, it can usually show IPTV.

What you actually receive

A subscription gives you credentials rather than equipment. Those come in one of two forms, and both do the same job.

• An M3U playlist — a web address pointing at a file that lists every channel and where to find its stream.
• Xtream Codes details — a server address, a username and a password, which the player uses to fetch the same list.

The player does the work

An IPTV player is an app that reads your playlist, builds a channel list from it, and plays a stream when you select a channel. It is the equivalent of the menu system on a set-top box, except you choose which one to use.

Different players suit different devices. Some show a full programme grid, some a simple list, and some let you record. None of them changes what you are subscribed to — they are just different front ends onto the same channels.

What an EPG is

The electronic programme guide is the schedule: what is on each channel now, and what is on next. IPTV services supply the guide data separately from the streams, and the player merges the two so you can browse by time as well as by channel.

A guide that looks empty when you first install a player is usually still downloading rather than broken.

What affects the picture

Four things, in roughly this order: the quality of the source channel, your internet connection, the device decoding the stream, and the player's own settings.

A rough guide is around 10 Mbps for HD and around 25 Mbps for 4K, on a connection that stays steady rather than one that merely peaks high. Wired Ethernet behaves better than Wi-Fi, and 5 GHz Wi-Fi behaves better than 2.4 GHz.

Is it legal?

The technology is a delivery method, no different in principle from any other streaming service. What matters legally is whether the provider holds the rights to the content it supplies. That is a question to ask any IPTV provider directly, including this one, and to get a straight answer about before subscribing.