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Install the skill (once)
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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 blinds transition Length of the transition in seconds: 1.0
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 blinds transition.
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 | 1.0 | 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.
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Join clipA.mp4 and clipB.mp4 with a 1.0 second venetian blinds transition: cut the frame into 10 equal horizontal slats that fill with B one after another, bottom slat first and top slat last, each slat filling from its top edge down (ffmpeg xfade transition=vuslice, duration=1, offset = A's length minus 1). Crossfade the audio over the same 1.0 second. Match B's size and frame rate to A. Use ffmpeg, keep the audio and save it as output.mp4 (H.264, yuv420p).Run it without Claude
This is the exact command we tested. Save it as blinds-transition.sh and run:
sh blinds-transition.sh clipA.mp4 clipB.mp4 output.mp4Show the command
#!/bin/sh
# Blinds transition: clip B closes over clip A in ten horizontal slats, bottom slat first, over 1s. The sound crossfades underneath.
# Usage: sh blinds-transition.sh clipA.mp4 clipB.mp4 output.mp4 (both clips need an audio track)
set -e
A="$1"; B="$2"; OUT="$3"
D=1.0 # transition length in seconds
LEN=$(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=${SIZE#*x}
# xfade needs both clips at the same size and frame rate, so B is fitted to A first.
# vuslice cuts the frame into 10 horizontal slats that fill with B one after another, bottom to top.
ffmpeg -y -i "$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=$FPS,format=yuv420p,setsar=1[b];\
[a][b]xfade=transition=vuslice:duration=$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"
