Get this effect
Switch to Code in your Claude Desktop App
Install the skill (once)
Show the prompt
Install the Recharm video effects skill: download https://recharm-growth-staging.s3.us-east-2.amazonaws.com/website/downloads/recharm-video-effects.zip and unzip it into ~/.claude/skillsAsk for the effect
Join clipA.mp4 and clipB.mp4 with a diagonal wipe Length of the transition in seconds: 0.6
Several videos, several effects, one ask
Put your clips in the folder, mention them with @, and ask for everything at once. Claude runs one tested script after another on each clip, then joins them.
Put a sale badge on @clip1.mp4, give @clip2.mp4 a VHS look, then join them with a diagonal wipe.
Settings you can change
Ask Claude to change any of these, or edit them at the top of the command.
| Setting | Default | What it does |
|---|---|---|
D | 0.6 | Length of the transition in seconds. |
Without the skill
Don’t want to install the skill? Paste this prompt into Claude Code and Claude writes the command itself.
Show the prompt
Join clipA.mp4 and clipB.mp4 with a 0.6 second diagonal wipe. The transition starts 0.6 seconds before A ends. A straight hard edge at 45 degrees travels from the top-left corner to the bottom-right corner: with progress q from 0 to 1 eased by smoothstep (e = q*q*(3-2q)), a pixel at (x, y) shows B when (x+y)/(width+height) < e and A otherwise, so B appears in the top-left corner first and A leaves last from the bottom-right. No soft edge, border or fade (ffmpeg xfade with transition=custom). Crossfade the audio over the same 0.6 seconds. Fit B to A's size and frame rate first. The output is 11.4 seconds at 30fps. Use ffmpeg, keep the audio and save it as output.mp4.Run it without Claude
This is the exact command we tested. Save it as diagonal-wipe.sh and run:
sh diagonal-wipe.sh clipA.mp4 clipB.mp4 output.mp4Show the command
#!/bin/sh
# Diagonal wipe: a straight 45-degree edge travels from the top-left corner to the bottom-right, swapping clip A for clip B, over 0.6s. The sound crossfades underneath.
# Usage: sh diagonal-wipe.sh clipA.mp4 clipB.mp4 output.mp4 (both clips need an audio track)
set -e
A="$1"; B="$2"; OUT="$3"
D=0.6 # transition length in seconds
LEN=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$A")
OFFSET=$(echo "$LEN - $D" | bc)
SIZE=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$A")
FPS=$(ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate -of csv=p=0 "$A")
W=${SIZE%x*}; H=${SIZE#*x}
# xfade's P runs from 1 to 0, so Q=1-P is the progress, eased with smoothstep.
# A pixel shows B once (X+Y)/(W+H), its place along the top-left to bottom-right diagonal, falls behind the edge.
EDGE='st(0,1-P);st(1,ld(0)*ld(0)*(3-2*ld(0)));if(lt((X+Y)/(W+H),ld(1)),B,A)'
# xfade needs both clips at the same size and frame rate, so B is fitted to A first
ffmpeg -y -i "$A" -i "$B" -filter_complex "\
[0:v]fps=$FPS,format=yuv420p,setsar=1[a];\
[1:v]scale=$W:$H:force_original_aspect_ratio=increase,crop=$W:$H,fps=$FPS,format=yuv420p,setsar=1[b];\
[a][b]xfade=transition=custom:expr='$EDGE':duration=$D:offset=$OFFSET[v];\
[0:a][1:a]acrossfade=d=$D[au]" \
-map "[v]" -map "[au]" -c:v libx264 -crf 18 -pix_fmt yuv420p -c:a aac "$OUT"
