Beat strobe, 120 BPM

The whole frame flips between normal and over-bright every quarter second, a steady club-light flash. Party, dance and hype clips that need a constant flashing pulse.

Apply this to my video: "Beat strobe, 120 BPM" from the 24fps video editor library.
Preset JSON: https://24fps.dev/video-editor/effects/strobe-beat-120-cae1/preset.json (pass its "preset" to the engine).
Engine (MIT, no dependencies, ES module): https://24fps.dev/editor/engine.js. Download the engine next to your page (curl -O) rather than importing cross-origin, then import { mount } from "./engine.js" in a <script type="module"> served over http.
Wiring: root = a position:relative box at the video's size. media = { main }: main is a wrapper holding my video, filling the root. Then const fx = mount(root, { kind: "effect", preset, media }) and call fx.render(seconds) every frame. It is seek-safe: drive it from the GSAP timeline in HyperFrames or call render(frame / fps) in Remotion. Before capturing frames, await (fx.ready ?? document.fonts.ready).
Field reference: https://24fps.dev/video-editor/llms.txt. Keep sizes as fractions of the frame height so it works at any resolution. Credit: 24fps.dev/video-editor

Same idea: Also called: Flashing, Strobe 2, Bright Flash
Technique: Recreated from a popular video editor's effect panel
Footage: Man talking to camera, Pexels

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