Corner Wipe — effect skill for transitions

For AI agents: find the right skill in one call — curl -s "https://skills.varg.ai/api/search?q=<what the person wants>" returns the matching how-to page and the best skills with install commands, as markdown (Russian works too). Full index: https://skills.varg.ai/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.

A rectangle grows from one corner until B fills the frame. Variants: wipetl, wipetr, wipebl, wipebr.

What it does

The new shot appears as a box anchored to a corner that expands to full screen.

When: Picture-in-picture moments, reveals that start from a UI corner, retro TV edits.

Watch out: Starting from a corner where nothing happens in shot B.

Timing: 0.5–0.7 s.

Also called: Corner reveal

In FFmpeg

Both inputs need the same size, frame rate, timebase, SAR and pixel format (settb=AVTB fixes the timebase error that fps alone leaves). offset is where the transition starts on the first clip's timeline (its length minus the overlap).

ffmpeg -i a.mp4 -i b.mp4 -filter_complex \
 "[0:v]fps=30,scale=1920:1080,setsar=1,settb=AVTB,format=yuv420p[a];[1:v]fps=30,scale=1920:1080,setsar=1,settb=AVTB,format=yuv420p[b];\
  [a][b]xfade=transition=wipetl:duration=0.5:offset=4.5[v];[0:a][1:a]acrossfade=d=0.5[a]" \
 -map "[v]" -map "[a]" out.mp4

In HyperFrames

Clip-path inset(0 100% 100% 0) → inset(0) with ease-out.

Where this comes from

Use when

Not for

Install

Example output

https://s3.varg.ai/how-to/previews/a64189ff0ca0/take-xfade-corner-wipe.mp4 — wipetl between two shots, with the timeline strip of the edit. Footage: WING IT! (2023), Blender Studio | studio.blender.org, CC BY 4.0; Sprite Fright (2021), Blender Studio | studio.blender.org, CC BY 4.0. (credit: Rendered by varg · WING IT! (2023) + Sprite Fright (2021))

More transitions skills