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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 zig-zag wipe Length of the transition in seconds: 0.8 Number of teeth down the height of the frame: 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 zig-zag 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 | 0.8 | Length of the transition in seconds. |
TEETH | 6 | Number of teeth down the height of the frame. |
DEPTH | 0.25 | How far each tooth points ahead of the edge, as a share of the frame's width. |
Without the skill
Don’t want to install the skill? Paste this prompt into Claude Code and Claude writes the command itself.
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Join clipA.mp4 and clipB.mp4 with a 0.8 second zig-zag wipe that starts 0.8 seconds before A ends. Clip B is revealed behind a saw-tooth edge that moves from the left side to the right side. The edge has 6 teeth down the height of the frame, with a tooth tip at the very top and bottom and every 1/6 of the height in between; each tip points right, 25% of the frame's width ahead of the notches. At the start the tips sit on the left edge; at the end the notches reach the right edge. Ease the movement out: progress = 1 - (1 - t/0.8)^2. Soften the edge over one pixel so the slanted sides aren't jagged. Crossfade the audio over the same 0.8 seconds. Match B's size and frame rate to A. Use ffmpeg (xfade with a custom expression works) and save it as output.mp4.Run it without Claude
This is the exact command we tested. Save it as zigzag-wipe.sh and run:
sh zigzag-wipe.sh clipA.mp4 clipB.mp4 output.mp4Show the command
#!/bin/sh
# Zig-zag wipe: a saw-tooth edge sweeps left to right over 0.8s, swapping clip A for clip B. The sound crossfades underneath.
# Usage: sh zigzag-wipe.sh clipA.mp4 clipB.mp4 output.mp4 (both clips need an audio track)
set -e
A="$1"; B="$2"; OUT="$3"
D=0.8 # transition length in seconds
TEETH=6 # teeth down the height of the frame
DEPTH=0.25 # how far each tooth points ahead of the edge, as a share of the frame's width
LEN=$(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=${SIZE#*x}
# xfade's P runs from 1 to 0, so 1-P*P is the progress, easing out. The edge's x position is a
# triangle wave down the frame: tips (B furthest ahead) at the top, bottom and every H/TEETH between.
# It starts with the tips at the left edge and ends with the notches at the right one. Pixels within
# half a pixel of the edge mix A and B, which keeps the slanted sides smooth.
TOOTH="abs(2*mod(Y*$TEETH/H,1)-1)"
EDGE="((1-P*P)*(1+$DEPTH)-$DEPTH+$DEPTH*$TOOTH)*W"
ZIGZAG="A+(B-A)*clip($EDGE-X+0.5,0,1)"
# xfade needs both clips at the same size and frame rate, so B is fitted to A first
ffmpeg -y -i "$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=$FPS,format=yuv420p,setsar=1[b];\
[a][b]xfade=transition=custom:expr='$ZIGZAG':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"
