One speaker. One curved LED wall. Fifteen minutes that had to hold attention.
That was the job. A pre-recorded keynote for ZKP (Zero Knowledge Proof), delivered by Kevin O’Leary on a Miami soundstage in May 2026. Caldera Films produced it. Our crew, our stage build, our day.
This is how LED wall keynote video production actually works when the speaker is someone the whole room already knows. And what it means if your next conference is in a Miami hotel ballroom.
You can watch the keynote and see stills from the set on the ZKP with Kevin O’Leary case study.
The brief: a keynote, not a commercial
ZKP had a technical subject. Zero-knowledge proofs. Verifiable AI. Ideas that lose people fast if the delivery goes flat.
They didn’t want a talking head in an office. They didn’t want a phone-on-a-tripod event recording either. The brief asked for a broadcast-style keynote: a polished stage, the slides living inside the set, and no live audience to lean on.
Kevin O’Leary brings authority on his own. The production had to match it without getting in its way. A technical talk had to feel like an event.
The set: a curved LED wall, laid out as three screens
We built the keynote on a curved LED wall split into three screens, with a raised black stage and steps in front of it. ZKP’s identity lived in the wall itself. The slides played behind Kevin in-camera, the way an audience would see them in a hall. Not added in post.
That choice does two things.
The speaker stands inside the world he’s talking about. The slides change behind him on cue, in the same frame.
And the wall becomes a light source. On ZKP we pulled light from the panels so the whole frame carried the brand’s color, with large soft sources rigged overhead for the stage. The wide shots read as one environment, not a person pasted onto graphics.
We had one prep day and one shoot day. The prep day is where the LED work gets solved.
How an LED wall behaves on camera
An LED wall looks simple in the room. On camera, it isn’t. Four things decide whether the wall reads as a set or as a problem. They apply to any LED stage or ballroom screen, not just ours.
Moiré. The wall is a grid of pixels. The camera sensor is a grid too. When the two interfere, you get rippling patterns across the screen. The fixes are distance, lens choice and focus. Keep the wall slightly soft behind the speaker. Avoid shooting it square-on and razor sharp. A finer pixel pitch helps. Testing helps more.
Refresh and shutter. LED panels refresh many times per second. If the camera’s frame rate and shutter don’t sit well with the wall’s refresh, you see flicker or rolling bands that nobody in the room ever notices. A high-refresh wall and a camera test at the planned settings catch it before talent arrives.
Exposure balance. The wall emits light. Too bright, and it blows out behind the speaker and floods his face with color. Too dim, and the set looks dead. The wall usually runs well below full brightness, and the speaker gets light of his own so skin stays honest.
Angles. LED panels can shift in color and brightness when seen from a steep side angle. Seams and content edges show up in wide shots. A curved wall helps the image hold as the camera moves across it. Every angle still gets checked.
That’s why camera rehearsal on ZKP started before talent call. Every move was checked against the wall first.
The day
Close to thirty people were on the call sheet. A DP and two camera operators. A two-person crane team. An AC team. A DIT handling media and a live feed. Gaffer and grip. Sound. An art department. A script supervisor. Wardrobe and makeup. Two teleprompter operators. And a stills photographer shooting alongside the film crew.
We recorded in blocks. One section of the talk at a time, each matched to its slide on the wall. Short resets between blocks. A camera reset after lunch. A 15-minute keynote is easier to get right in chapters than in one nervous take.
The prompter carried the script. Kevin read from a teleprompter. A script supervisor tracked every line, because scripts for high-profile talks change on the day. This one did.
The client watched live. ZKP’s team followed remotely on a live feed and weighed in on shots and lighting as we went. Nobody had to wait for dailies.
The crane went last. We shot the crane intros and outros at the end of the day, once the room was fully dialed in. The crane gives the reveals across the stage that tell a viewer this is an event. The camera operators held the performance.
The framing rule all day: wide enough to show the scale of the production, tight enough to hold a strong performance.
What we delivered
A finished keynote film, about fifteen minutes long. Built to be ZKP’s flagship credibility piece: enterprise-grade production, paired with one of the most recognizable investor voices in the world.
Stills from the photographer and the BTS frames live on the case study page.
What this means for Miami conferences and hotel ballrooms
Most conference keynotes in Miami now happen in front of an LED wall. Hotel ballrooms, convention halls, rented stages. The physics are the same as on our stage. What changes is control.
In a ballroom, the wall usually belongs to the AV company, not the video crew. Before show day, ask:
- What is the wall’s pixel pitch and refresh rate, and can the processor be adjusted for camera?
- Can the camera team test during rehearsal, at show brightness, with the real slides?
- Who controls wall brightness during the session, and can it come down for camera without hurting the room?
- Where can cameras stand? Positions far off to the side see the most color shift.
- Can we take a clean audio feed from the house board?
If the event also needs speaker interviews or executive soundbites, that’s its own craft. Our corporate interview work covers it, and it can be planned into the same shoot.
And sometimes the answer isn’t to film the live session at all. If the keynote has to be right, record it on a stage first, with a prompter, resets and a crane, the way we did for ZKP. The event gets a finished film, not a hopeful recording.
That’s the same idea behind our Not An Ad series: a filmed talk people choose to watch carries more weight than one more interruption.
Planning a keynote in Miami?
We’re based in Miami. For corporate event video production across the city, our Miami video production page has the wider picture.
Tell us the room, the speaker and what the film has to do. We’ll tell you how we’d shoot it.
FAQ
Can you film a keynote in front of an LED wall without flicker or moiré?
Yes, with testing. Flicker comes from how the wall’s refresh rate interacts with the camera’s frame rate and shutter. Moiré comes from the wall’s pixel grid interfering with the camera sensor. A camera test on the actual wall, at the planned settings, before the speaker arrives is the fix. Distance, focus and lens choice handle most moiré.
Should we record our keynote live at the event or pre-record it on a stage?
Live captures the room and the reaction. A stage gives you retakes, a teleprompter, controlled light and camera moves you can’t do over an audience. If the keynote has to be flawless, or the speaker’s time is limited, pre-recording is often the safer call.
What should we ask the AV company before filming a conference in a Miami hotel ballroom?
Ask for the LED wall’s pixel pitch and refresh rate, whether the processor can be adjusted for camera, a rehearsal window for a camera test, who controls wall brightness during sessions, where cameras can stand, and a clean audio feed from the house board.