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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 pixelate transition 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 pixelate 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 | 0.6 | Length of the transition in seconds. |
In other editors
From each editor’s own help pages, in our words. We haven’t run these ourselves.
Closest built-in: Hexa Mosaic · desktop
- Import clips and drag them onto the timeline.
- Open the Transitions tab and search for Hexa Mosaic.
- Click the plus icon to add it to the timeline.
- Move the slider to adjust the duration.
Page says Hexa Mosaic gives a pixel-block distortion but doesn't say whether the blocks are square.
Source: The 10 Best YouTube Transitions for Content Creators | Make Professional Videos (CapCut), checked October 22, 2026.
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 pixelate transition: A breaks into big square pixels that resolve into B (ffmpeg xfade pixelize). Crossfade the audio over the same 0.6 seconds. Match B's size and frame rate to A. Use ffmpeg and save it as output.mp4.Run it without Claude
This is the exact command we tested. Save it as pixelate-transition.sh and run:
sh pixelate-transition.sh clipA.mp4 clipB.mp4 output.mp4Show the command
#!/bin/sh
# Pixelate transition: clip A breaks into big square pixels that resolve into clip B, over 0.6s. The sound crossfades underneath.
# Usage: sh pixelate-transition.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=${SIZE#*x}
# xfade needs both clips at the same size and frame rate, so B is fitted to A first
ffmpeg -y -i "$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=$FPS,format=yuv420p,setsar=1[b];\
[a][b]xfade=transition=pixelize:duration=$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"
