Explainer20 October 2026

Why Live Streams Drop, in Plain English

Written for people who have been told their stream had a bandwidth problem and would like to know what that means.

Upload is not download

Home and office broadband is built for downloading. The connection you are given is usually fast coming in and much slower going out.

Streaming is entirely an upload activity. So a connection that streams Netflix perfectly can be useless for broadcasting, and the speed test everyone quotes is measuring the wrong direction.

Bitrate and bandwidth

Bitrate is how much data your stream produces per second. Higher bitrate means better picture.

Bandwidth is how much your connection can carry.

If bitrate is close to bandwidth, any dip causes a problem. Rule of thumb: your available upload should be comfortably more than the bitrate, not equal to it, because connections fluctuate.

What buffering actually is

The player downloads slightly ahead of what you are watching and holds it in a buffer. If data arrives slower than it is consumed, the buffer empties and playback stops until it refills.

So buffering is not the stream failing. It is the stream arriving slower than it is being watched.

Contention

Most connections are shared. A venue with one line serving four hundred delegates on their phones has four hundred people competing with your broadcast.

This is why a stream that tested fine at nine in the morning fails at eleven. Nothing broke. The room filled up.

Wireless

WiFi adds another shared, unpredictable layer. It is fine for browsing and unsuitable for sustained upload. Wired where possible, always.

What a viewer sees versus what is happening

A frozen picture, a spinning wheel or a drop in quality can be caused at any point: your encoder, your connection, the platform, or the viewer's own broadband.

If one viewer reports a problem and others do not, it is almost always their end. If everyone reports it at once, it is yours.

More on reliable outdoor streaming.