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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 whip pan Length of the whip in seconds: 0.4 Output frame rate: 30
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 whip pan.
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 | 0.4 | Length of the whip in seconds. |
FPS | 30 | Output frame rate. |
STEPS | 32 | Positions averaged into each frame of the whip; more gives smoother motion blur. |
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 0.4 second whip pan. Over the last 0.4s of A and the first 0.4s of B, put the two clips side by side (A on the left, B on the right) and slide a 540x960 window from A to B, easing in and out with a cubic curve (slow, fast in the middle, slow), so the picture moves to the left. Add horizontal motion blur by rendering that slide at 960fps and averaging every 32 frames into one 30fps frame. Before and after the whip, A and B play untouched and sharp. Crossfade the audio over the same 0.4 seconds. The result is 11.6 seconds long, 540x960, 30fps, H.264 yuv420p. 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 whip-pan.sh and run:
sh whip-pan.sh clipA.mp4 clipB.mp4 output.mp4Show the command
#!/bin/sh
# Whip pan: the camera flicks sideways off clip A and lands on clip B in 0.4s, smeared by motion blur. The sound crossfades underneath.
# Usage: sh whip-pan.sh clipA.mp4 clipB.mp4 output.mp4 (both clips need an audio track)
set -e
A="$1"; B="$2"; OUT="$3"
D=0.4 # length of the whip in seconds
FPS=30 # output frame rate
STEPS=32 # positions blended into each frame of the whip (more = smoother motion blur)
LEN=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$A")
CUT=$(echo "$LEN - $D" | bc)
SIZE=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$A")
W=${SIZE%x*}; H=${SIZE#*x}
# A's last D seconds sit beside B's first D seconds and a W-wide window slides across them, slow-fast-slow
# (cubic ease in and out). It moves at FPS*STEPS frames a second and every STEPS of them average into one
# output frame, which smears the picture the way a fast camera move does.
P="(t/$D)"
X="$W*if(lt($P,0.5),4*pow($P,3),1-pow(2-2*$P,3)/2)"
ffmpeg -y -i "$A" -i "$B" -filter_complex "\
[0:v]fps=$FPS,format=yuv420p,setsar=1,split[a1][a2];\
[1:v]scale=$W:$H:force_original_aspect_ratio=increase,crop=$W:$H,fps=$FPS,format=yuv420p,setsar=1,split[b1][b2];\
[a1]trim=0:$CUT,setpts=PTS-STARTPTS[ahead];\
[a2]trim=$CUT,setpts=PTS-STARTPTS[atail];\
[b1]trim=0:$D,setpts=PTS-STARTPTS[bhead];\
[b2]trim=$D,setpts=PTS-STARTPTS[btail];\
[atail][bhead]hstack,fps=$((FPS * STEPS)),crop=$W:$H:x='min($W,$X)':y=0,tmix=frames=$STEPS,fps=$FPS[whip];\
[ahead][whip][btail]concat=n=3:v=1:a=0[v];\
[0:a][1:a]acrossfade=d=$D[au]" \
-map "[v]" -map "[au]" -c:v libx264 -crf 18 -pix_fmt yuv420p -c:a aac "$OUT"
