Photo Booth Fix: 360 slow-motion video looks choppy

What guests and the attendant see

Guests see the "money shot" segment jerk instead of glide: hair and dresses move in steps, and the spin looks like a slideshow.

The attendant sees the same thing on the sharing station. Often the normal-speed and reverse segments look fine and only the slow-motion part stutters, which is the clue that frame rate is the cause. Smearing, or a pulsing, banded look in slow motion, points at light instead.

60-second triage

1. Open the event's recording settings between groups.
2. Set capture to 1080p at 120 fps. If you were in 4K, this alone may be the fix.
3. Set the slow-motion segment to 40 to 50% speed.
4. Turn on ramp or smooth transition if your app has it.
5. Record one test with a colleague on the platform and review it at full size.

Likely causes, ranked

1. Captured at 30 or 60 fps and slowed too much. Footage at 30 fps stutters below 50% speed.
2. Recording in 4K. Many phones cannot record 4K at 120 fps, so the frame rate drops.
3. Low light. High frame rates need fast shutter speeds and more light; a dim setup gives noisy, smeary slow motion.
4. Light flicker. Some LED lights flicker when dimmed, which shows up as pulsing or banding at high frame rates.
5. Hard speed changes. A jump from 100% straight to 40% reads as a jolt; an eased ramp looks smooth.
6. Arm wobble. Small shakes look like stutter once slowed down.

The full fix, step by step

In the booth app:

1. Capture 1080p at 120 fps, with final output at 30 fps.
2. Record 10 to 12 seconds: normal speed for the first few seconds, slow motion at 40 to 50% for roughly seconds 3 to 7, then a short reverse or boomerang at 100%.
3. Ease into slow motion. A ramp from 100% down to 40% over about half a second looks smoother than a hard cut.
4. Light the platform with two stand-mounted lights raised 7 to 8 ft and tilted roughly 30 degrees down at the center, bright enough that the phone is not starved for light.
5. If you see pulsing, raise the light output rather than dimming further, or switch to lights rated flicker-free.

In editing, for premium packages:

1. Know the source frame rate before you retime. At 30 fps, optical-flow retiming stays clean from 60 to 100%. At 60 fps, 50 to 100%. At 120 fps, 25 to 100%.
2. Leave high-frame-rate clips at their native rate and retime on the timeline, so you control where the ramps fall.
3. Make each speed change last 8 to 15 frames. Under 6 frames reads as a jump cut; over 20 feels sluggish.
4. If you see warping around arms, hair or confetti, raise the speed about 10% or switch that segment to frame blending.

Prevent it next event

• Lock in the default: 1080p at 120 fps for every in-booth 360 event.
• Check recording settings at T-2 on the exact phone, then again at setup.
• Use an iPhone on the arm; its slow-motion frame rates are higher than most iPads offer.
• Record 4K only for premium edits, and only on a device you have tested for heat, storage and frame rate.
• Watch each setup test video full screen: one person, two people, and one big spin.

When to switch to the backup device

If the capture device cannot hold 120 fps, or slow motion still stutters after the settings change, swap to the backup iPhone with the event loaded. Do it at the next lull, unless every video is unusable.

If the backup stutters too, raise the slow segment to 50% and lean on normal speed and reverse until you can sort out lighting or settings. Premium clients can still get smooth edits from clips shot at 120 fps, so prioritize getting capture right over in-app effects.