# Blur Through — effect skill for transitions

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A blurs out of focus, the shots swap at peak blur, and B pulls back into focus.

- **Type:** [Effect](https://varg.ai/how-to/effects.md) · [Transitions](https://varg.ai/how-to/browse/skills/transitions.md)
- **Slug:** `blur-transition`
- **Status:** live
- **Publisher:** HeyGen (community)
- **License:** Apache-2.0
- **Source:** https://github.com/heygen-com/hyperframes/tree/main/registry/blocks/transitions-blur
- **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 [Blur Transitions](https://github.com/heygen-com/hyperframes/tree/main/registry/blocks/transitions-blur) by HeyGen (HyperFrames), Apache-2.0. The write-up and recipes below are varg's.

Soft defocus (or a directional smear) hides the swap; like a lens racking between two scenes.

**When:** Calm, premium and lifestyle pieces; when two shots have very different colours.

**Watch out:** Very short blurs read as a focus mistake; give the peak a few frames.

**Timing:** 0.5–1.0 s (CapCut Blur 0.47 s); calm 20–30 px blur, high energy 3–6 px

**Also called:** Blur, Horizontal Blur, Vertical Blur, Blurred Highlight, focus pull, defocus transition

### In FFmpeg

Crossfade with a symmetrical Gaussian blur peak (A 5 s, T 0.6 s):
```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=fade:duration=0.6:offset=4.4,gblur=sigma=20:enable='between(t,4.5,4.9)'[v]" -map "[v]" out.mp4
```
`xfade=transition=hblur` is a built-in horizontal-blur crossfade.

### In HyperFrames

CSS blur crossfade:
```js
tl.to("#s1", { filter: "blur(10px)", scale: 1.03, opacity: 0, duration: 0.6, ease: "power2.inOut" }, T);
tl.fromTo("#s2", { filter: "blur(10px)", scale: 0.97, opacity: 0 }, { filter: "blur(0px)", scale: 1, opacity: 1, duration: 0.6, ease: "power2.inOut" }, T);
```
Block: `transitions-blur`; rack focus: `rack-focus`.

### In Remotion

```tsx
import {TransitionSeries, linearTiming, springTiming} from '@remotion/transitions';
import {linearBlur} from '@remotion/transitions/linear-blur';

<TransitionSeries>
  <TransitionSeries.Sequence durationInFrames={90}><ShotA /></TransitionSeries.Sequence>
  <TransitionSeries.Transition presentation={linearBlur({intensity: 0.1})} timing={linearTiming({durationInFrames: 20})} />
  <TransitionSeries.Sequence durationInFrames={90}><ShotB /></TransitionSeries.Sequence>
</TransitionSeries>
```
Total = 90 + 90 - 20 frames: the transition overlaps the two shots.
Shader presentations are built on Remotion's HTML-in-canvas: renders work out of the box (`--gl=angle`, or `--gl=swangle` without a GPU); the Studio preview needs Chrome with `chrome://flags/#canvas-draw-element` enabled. CSS-only alternative: custom presentation with `filter: blur(${p*20}px)`; `blurSlide({})` adds motion.

### In CapCut

Transitions tab → Blur → Blur, Horizontal Blur, Vertical Blur, Vertical Blur II, Blurred Highlight. 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

- [Blur Transitions](https://skills.varg.ai/component/hf.transitions-blur/) (hyperframes): npx hyperframes add transitions-blur
- [LinearBlur](https://skills.varg.ai/component/glt.linear-blur/) (gl-transitions): npm install gl-transitions
- [Focus Pull](https://skills.varg.ai/component/remocn.focus-pull/) (remocn): npx shadcn@latest add @remocn/focus-pull
- [Rack Focus](https://skills.varg.ai/component/hf.rack-focus/) (hyperframes): npx hyperframes add rack-focus

### Where this comes from

- [FFmpeg filters: xfade](https://ffmpeg.org/ffmpeg-filters.html#xfade)
- [FFmpeg filters: gblur](https://ffmpeg.org/ffmpeg-filters.html#gblur)
- [Remotion: presentations](https://www.remotion.dev/docs/transitions/presentations)
- [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

- Calm, premium and lifestyle pieces; when two shots have very different colours.

## Not for

- Very short blurs read as a focus mistake; give the peak a few frames.

## 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/b83900ef91bc/take-blur-transition.mp4 — hblur between two shots, with the timeline strip of the edit. Footage: Spring (2019), Andy Goralczyk / Blender Foundation (Blender Studio) | studio.blender.org, CC BY 4.0; Big Buck Bunny (2008), (c) copyright 2008, Blender Foundation | www.bigbuckbunny.org, CC BY 3.0. (credit: Rendered by varg · Spring (2019) + Big Buck Bunny (2008))

## 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 <agent> -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