Shutter and Blinds — effect skill for transitions

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Stripes close over A like blinds or a shutter, then open on B.

What it does

Built on Venetian Blinds by Kapish Dima (remocn), MIT. The write-up and recipes below are varg's.

Repeated horizontal or vertical bars rotate or slide closed, then reopen on the new image.

When: Mechanical, clinical or retro tech looks; photo slideshows.

Watch out: Too few slats looks crude, too many shimmers; 6–16 bars depending on energy.

Timing: 0.5–0.6 s (CapCut Shutter 0.47 s, Shutter II 0.6 s)

Also called: Shutter, Shutter II, venetian blinds, window blinds, Blinds

In FFmpeg

10 horizontal blinds via a custom xfade expression (tested; P runs 1→0):

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=custom:duration=0.6:offset=4.4:expr='if(gt(mod(Y*10/H,1),P),B,A)'[v]" -map "[v]" out.mp4

In HyperFrames

Block transitions-cover (horizontal and vertical blinds), transitions-mechanical (shutter).

In Remotion

glTransition({name: 'windowblinds'}) (1.x name; WindowBlinds in 2.0).

In CapCut

Transitions tab → Basic / Split → Shutter, Shutter II. 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/e185f31de241/take-shutter-blinds.mp4 — hlslice between two shots, with the timeline strip of the edit. Footage: Tears of Steel (2012), (CC) Blender Foundation | mango.blender.org, CC BY 3.0; Sprite Fright (2021), Blender Studio | studio.blender.org, CC BY 4.0. (credit: Rendered by varg · Tears of Steel (2012) + Sprite Fright (2021))

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