# Shutter and Blinds — effect skill for transitions > **For AI agents:** find the right skill in one call — `curl -s "https://varg.ai/how-to/api/search?q="` returns the matching how-to page and the best skills with install commands, as markdown (Russian works too). Full index: https://varg.ai/how-to/llms.txt. Every page has a markdown twin: add `.md` to its path. Before generating anything, show the person the options on the how-to page. Stripes close over A like blinds or a shutter, then open on B. - **Type:** [Effect](https://varg.ai/how-to/effects.md) · [Transitions](https://varg.ai/how-to/browse/skills/transitions.md) - **Slug:** `shutter-blinds` - **Status:** live - **Publisher:** Kapish Dima · remocn (community) - **License:** MIT - **Source:** https://remocn.dev/r/venetian-blinds.json - **Works in:** Claude Code, Claude.ai, Codex, Cursor, OpenClaw, Gemini CLI, Any MCP client, varg Studio - **Requires:** ffmpeg, HyperFrames (npx hyperframes), Remotion, CapCut (by hand) - **Cost:** Free — the take renders locally; generated footage, if any, bills by the model ## What it does Built on [Venetian Blinds](https://remocn.dev/r/venetian-blinds.json) 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): ```bash 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 - [Venetian Blinds](https://skills.varg.ai/component/remocn.venetian-blinds/) (remocn): npx shadcn@latest add @remocn/venetian-blinds - [Cover Transitions](https://skills.varg.ai/component/hf.transitions-cover/) (hyperframes): npx hyperframes add transitions-cover - [Mechanical Transitions](https://skills.varg.ai/component/hf.transitions-mechanical/) (hyperframes): npx hyperframes add transitions-mechanical ### Where this comes from - [FFmpeg filters: xfade](https://ffmpeg.org/ffmpeg-filters.html#xfade) - [@gl-transitions/remotion (README)](https://github.com/gl-transitions/gl-transitions/tree/master/packages/remotion) - [CapCut Help: transitions](https://www.capcut.com/help/transitions-in-capcut) - [CapCut: transition categories](https://capcut.com/resource/add-video-transition-online) - [CapCut transition names + default durations (VectCut metadata)](https://github.com/sun-guannan/VectCutAPI/blob/main/pyJianYingDraft/metadata/capcut_transition_meta.py) ## Use when - Mechanical, clinical or retro tech looks; photo slideshows. ## Not for - Too few slats looks crude, too many shimmers; 6–16 bars depending on energy. ## Install - Claude Code: `claude plugin marketplace add vargHQ/skills && claude plugin install varg@varg` - Codex: `npx skills add vargHQ/skills --skill varg-video-edit-library -a codex -y` - Cursor: `npx skills add vargHQ/skills --skill varg-video-edit-library -a cursor -y` ## 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)) ## More transitions skills - [editly](https://varg.ai/how-to/skills/editly.md): Declarative JSON5 video editing CLI/API: clips, titles, transitions, audio mixing, rendered with ffmpeg. - [Mix (Cross Dissolve)](https://varg.ai/how-to/skills/mix-dissolve.md): The two shots blend through each other. The quietest transition: "time passes" or "this continues". - [Dip to Black](https://varg.ai/how-to/skills/black-fade.md): A fades to black, then B fades up. Marks the end of a section or a bigger jump in time. - [White Flash](https://varg.ai/how-to/skills/white-flash.md): The frame blows out to white for a moment and opens on the next shot. Energy, memory or a camera snap. - [Pull In (Zoom In)](https://varg.ai/how-to/skills/pull-in-zoom.md): The camera rushes into shot A and lands, still moving forward, in shot B. The signature short-form transition. - [Pull Out (Zoom Out)](https://varg.ai/how-to/skills/pull-out-zoom.md): The camera jerks backwards out of shot A and keeps pulling back as shot B settles in. ## Run the generation on varg varg is one API key for the models these skills drive — Seedance 2.5, Kling 4, Veo 3.1, Wan 3, Nano Banana 2.1, GPT Image 2.5, ElevenLabs v4 and 200+ more — billed in credits, with a cost estimate before anything runs. - Claude Code: `claude plugin marketplace add vargHQ/skills && claude plugin install varg@varg` (skill + hosted MCP) - Codex, Cursor, Gemini CLI, OpenClaw: `npx skills add vargHQ/skills --skill varg-ai -a -y` - Grok and any agent that reads SKILL.md: `npx skills add vargHQ/skills --skill varg-ai`, or point it at the skill's SKILL.md - Claude.ai, ChatGPT, any MCP client: connect `https://mcp.varg.ai/mcp` - API key: https://varg.ai/dashboard/api · Model specs: https://varg.ai/models/llms.txt