Latency in live TV: why your neighbour hears the goal first
Why is live internet TV delayed compared with satellite or terrestrial TV, how long is the typical delay, and what can you do about it during sports broadcasts?
In short
- Live internet TV is delayed by encoding, segmenting, delivery and the player's reserve (buffer).
- With conventional internet streaming the delay is typically 15–40 seconds; low-latency technologies cut it to a few seconds.
- Delay is the price of stability: a larger reserve means less buffering.
Where does the delay come from?
- EncodingCompressing the signal takes a few seconds.
- SegmentingThe programme is produced in pieces a few seconds long, and a segment can only be sent once it is complete.
- DeliverySegments reach you via the content delivery network.
- Player bufferThe player downloads a few segments in advance so that a brief network disruption does not stop the picture.
Typical delays
| Distribution method | Typical delay |
|---|---|
| Terrestrial and satellite broadcasting | a few seconds |
| Cable TV and managed-network IPTV | a few seconds |
| Conventional internet streaming (HLS, DASH) | approx. 15–40 seconds |
| Low-latency streaming (LL-HLS, LL-DASH) | approx. 2–8 seconds |
Why can't it be reduced to zero?
Delay and stability pull in opposite directions. If the player keeps a smaller reserve, it gets closer to the live point, but a momentary network slowdown can stop the picture immediately. Providers therefore look for a balance between low delay and smooth playback.
Tips for sports broadcasts
- Turn off score notifications on your phone during the match.
- Use a wired connection: on a stable network the player works well with a smaller reserve.
- If you paused the broadcast earlier, jump back to the live point, otherwise the delay remains.
- Don't compare the picture from two different sources: radio or another service always arrives with a different delay.
Frequently asked questions
Why is the delay bigger on my phone than on the TV?
Different devices and networks (for example mobile data) work with different reserves. Restarting the app or jumping to the live point can reduce the difference.
Is it a fault if the broadcast is behind cable TV?
No, it is a natural feature of internet streaming. It is worth reporting if the delay keeps growing or the picture often stops.
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