White Flash — effect skill for transitions

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The frame blows out to white for a moment and opens on the next shot. Energy, memory or a camera snap.

What it does

Built on Flash Through White by HeyGen (HyperFrames), Apache-2.0. The write-up and recipes below are varg's.

Overexposed white flash peaking on the cut, then B fades back from white.

When: Beat drops, memories, photo-shoot vibes, hype reels, transitions into a freeze frame.

Watch out: Long white holds are tiring and an accessibility risk; keep it short and avoid repeated strobing.

Timing: 0.2–0.4 s (CapCut White Flash 0.40–0.47 s); peak on the beat

Also called: White Flash, Flash, Blanch, flash transition, fade through white, camera flash

In FFmpeg

Same size/fps/pixel format on both inputs (see the Normalize card). offset = duration(A) - T = 5.0 - 0.3 = 4.7.

ffmpeg -i a.mp4 -i b.mp4 -filter_complex \
"[0:v]fps=30,settb=AVTB,format=yuv420p[a];[1:v]fps=30,settb=AVTB,format=yuv420p[b];\
[a][b]xfade=transition=fadewhite:duration=0.3:offset=4.7[v];\
[0:a][1:a]acrossfade=d=0.3[au]" \
  -map "[v]" -map "[au]" -c:v libx264 -crf 18 -c:a aac out.mp4

Flash on a hard cut instead: eq=brightness=0.6:enable='between(t,4.0,4.066)' (eq supports timeline enable).

In HyperFrames

Shader flash-through-white from @hyperframes/shader-transitions placed at the cut (t = 4 s):

<div id="s1" class="scene" style="background:#0a0a0a"><video src="a.mp4" muted playsinline></video></div>
<div id="s2" class="scene" style="background:#0a0a0a"><video src="b.mp4" muted playsinline></video></div>
<script src="https://cdn.jsdelivr.net/npm/@hyperframes/shader-transitions/dist/index.global.js"></script>
<script>
  const tl = HyperShader.init({ bgColor: "#0a0a0a", scenes: ["s1", "s2"],
    transitions: [{ time: 4, shader: "flash-through-white", duration: 0.4 }] });
  window.__timelines = window.__timelines || {}; window.__timelines["main"] = tl;
</script>

Each .scene needs an explicit background-color equal to bgColor. Or install the ready block: npx hyperframes add flash-through-white.

In Remotion

import {TransitionSeries, linearTiming, springTiming} from '@remotion/transitions';
import {pushCut} from '@remotion/transitions/push-cut';

<TransitionSeries>
  <TransitionSeries.Sequence durationInFrames={90}><ShotA /></TransitionSeries.Sequence>
  <TransitionSeries.Transition presentation={pushCut({flashColor: '#ffffff', flashFrames: 3})} timing={linearTiming({durationInFrames: 11})} />
  <TransitionSeries.Sequence durationInFrames={90}><ShotB /></TransitionSeries.Sequence>
</TransitionSeries>

Total = 90 + 90 - 11 frames: the transition overlaps the two shots. pushCut (v4.0.500+) is a hard cut with a short punch-in and a flash; for a pure flash place a white <AbsoluteFill> in <TransitionSeries.Overlay durationInFrames={8}>.

In CapCut

Transitions tab → Light Effect / Basic → White Flash, Flash, Blanch, B&W Flash, Strobe. Desktop: drag the tile onto the cut between two clips and set Duration in the right panel ("Apply to all" reuses it on every cut). Mobile: tap the small white square between clips, pick the transition, drag the duration slider, tap ✓. Tab labels and placement change between versions and regions.

Ready-made components

Where this comes from

Use when

Not for

Install

Example output

https://s3.varg.ai/how-to/previews/a6324222749d/take-white-flash.mp4 — flash between two shots, with the timeline strip of the edit. Footage: Cosmos Laundromat (2015), (CC) Blender Foundation | gooseberry.blender.org, CC BY 4.0; Spring (2019), Andy Goralczyk / Blender Foundation (Blender Studio) | studio.blender.org, CC BY 4.0. (credit: Rendered by varg · Cosmos Laundromat (2015) + Spring (2019))

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