Every lesson so far has had a safety net: if a shot is wrong, you fix it in the edit. Live production removes the net. A school assembly, a basketball game or a graduation stream is edited as it happens, by a team cutting between cameras in real time, and whatever goes out is what the audience sees. That changes everything about how the work is organized. Decisions have to be made in a fraction of a second, so the roles, the words people use and the backup plans are all agreed long before anyone goes live.
The switcher and the control room
Every camera, graphics computer and video playback source plugs into a switcher (also called a vision mixer). It has two main rows of buttons. Program (PGM) is what is going out to the audience right now. Preview (PVW) is the next shot, set up and checked before it is used. The operator selects a source on preview, confirms it on the monitor, then takes it to program with either a cut (instant) or an auto transition such as a mix. A multiview monitor shows every source in small boxes, with program and preview outlined, so the whole room can see the options at once.
| Term | What it means | Why it matters |
|---|---|---|
| Program (PGM) | The output going live to the audience | Nothing reaches program without being checked first |
| Preview (PVW) | The next source, ready and visible only in the room | The last chance to catch a bad frame or a wrong camera |
| Cut / auto | An instant switch, or a timed transition such as a mix | Cuts for almost everything, exactly as in editing |
| Downstream keyer (DSK) | A graphics layer laid over whatever is on program | Lower-third names and scoreboards stay on screen through every camera change |
| Tally | A light on each camera showing its status | Red means on program — live; green means on preview — next |
| Multiview | One screen showing every source at once | The director chooses shots from it |
Studio roles and the language of the gallery
| Role | Where | Job |
|---|---|---|
| Director | Control room | Watches the multiview and calls every shot and graphic aloud |
| Technical director (TD) | Control room, at the switcher | Presses the buttons — executes the director's calls exactly on the word 'take' |
| Producer | Control room | Owns the running order and timing; tells the director when to stretch or cut a segment |
| Floor director (floor manager) | On the studio floor | The director's voice on set: cues the talent, gives countdowns and hand signals, keeps the floor safe and quiet |
| Camera operators | At each camera | Frame, focus and offer shots, following calls on headset |
| Audio mixer | Control room or audio booth | Balances every microphone and playback source live |
| Graphics and stream operators | Control room | Fire lower thirds and scoreboards; run the encoder and watch the outgoing stream |
- Intercom (often called comms) is a headset system that links the control room to the floor and cameras. On a party line, everyone on the channel hears everyone, so people speak only when it is needed.
- IFB (interruptible foldback) is the earpiece a presenter wears. It carries the program sound, and the producer can break in with instructions.
- Calls come in pairs: 'ready', then 'take'. 'Ready camera two' tells the TD to set camera two on preview and tells the operator to be steady. 'Take two' is the moment of the cut. The ready call is what makes a split-second cut possible.
- Countdowns go silent at the end. The floor director counts 'five, four, three' aloud, then shows two and one on their fingers, so no voice is picked up by the presenter's microphone as the show starts.
Encoders and upload bitrate maths
The switcher's program output still has to reach the internet. An encoder — a hardware box, or software such as OBS Studio — compresses it, usually to H.264 video with AAC audio, and sends it over a streaming protocol such as RTMP (or the more error-tolerant SRT) to the platform's ingest server, identified by a stream key. The platform then re-encodes it for viewers. The hard limit is your upload speed, which on home and school connections is often far lower than download. Internet speed varies minute to minute, so a stream that needs all of the measured upload will stutter and drop. A common rule of thumb is to keep at least 50% headroom: the upload should be at least one and a half times the total stream bitrate, video plus audio.
Redundancy: plan for the failure
- Find every single point of failure — one cable, one laptop, one Wi-Fi network — and decide what happens when it fails.
- Use wired Ethernet for the encoder. Wi-Fi in a gym full of phones is the most common reason school streams drop.
- Test at the venue, at the same time of day, with a private or unlisted test stream a day or more before the event.
- Record locally as well. A full-quality recording on the encoder or switcher means the event survives even if the stream does not, and can be uploaded afterwards.
- Back up the power and the path. A small UPS (battery backup) keeps the encoder running through a tripped breaker, and many platforms offer a backup ingest address a second encoder can feed.
- Have a holding slate ready — a branded 'we will be right back' graphic with music — so a failure looks like a planned pause rather than a frozen frame.
- Watch the real stream on a separate device. The control-room monitors show the program feed, not what viewers actually receive several seconds later.