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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 flicker cut Length of the flicker in seconds: 0.8 Frames each clip stays on screen before the picture flips to the other: 3
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 flicker cut.
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 flicker in seconds. |
FLIP | 3 | Frames each clip stays on screen before the picture flips to the other. |
FPS | 30 | Output frame rate. |
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 flicker cut that starts 0.8 seconds before the end of A, so the output is 11.2 seconds long. Use ffmpeg at 30fps, fitting B to A's size first. Overlap A's last 0.8 seconds with B's first 0.8 seconds (24 frames) and hard-switch the picture between them in runs of 3 frames: B for frames 0-2 of the overlap, A for 3-5, B for 6-8 and so on, so the last run (frames 21-23) is A, then B carries on untouched from 0.8 seconds into it. No blending or fading: every frame is entirely one clip. Leave every frame outside the overlap untouched. Keep the sound by crossfading the audio over the same 0.8 seconds. Save it as output.mp4 (H.264, yuv420p).Run it without Claude
This is the exact command we tested. Save it as flicker-cut.sh and run:
sh flicker-cut.sh clipA.mp4 clipB.mp4 output.mp4Show the command
#!/bin/sh
# Flicker cut: over the last 0.8s of clip A the picture flips between A and B every 3 frames, then settles on B. The sound crossfades underneath.
# Usage: sh flicker-cut.sh clipA.mp4 clipB.mp4 output.mp4 (both clips need an audio track)
set -e
A="$1"; B="$2"; OUT="$3"
D=0.8 # length of the flicker in seconds
FLIP=3 # frames each clip stays on screen before the picture flips to the other
FPS=30 # output frame rate
LEN=$(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 "$A")
W=${SIZE%x*}; H=${SIZE#*x}
# B is fitted to A's size; A's last D seconds and B's first D seconds overlap, and B is laid over A
# on every other run of FLIP frames, starting with B
ffmpeg -y -i "$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=$FPS,format=yuv420p,setsar=1,split[b1][b2];\
[a1]trim=end=$OFFSET,setpts=PTS-STARTPTS[head];\
[a2]trim=start=$OFFSET,setpts=PTS-STARTPTS[atail];\
[b1]trim=end=$D,setpts=PTS-STARTPTS[bhead];\
[b2]trim=start=$D,setpts=PTS-STARTPTS[brest];\
[atail][bhead]overlay=enable='eq(mod(floor(n/$FLIP),2),0)'[flicker];\
[head][flicker][brest]concat=n=3:v=1:a=0[v];\
[0:a][1:a]acrossfade=d=$D[au]" \
-map "[v]" -map "[au]" -r $FPS -c:v libx264 -crf 18 -pix_fmt yuv420p -c:a aac "$OUT"
