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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
Add a 70s film look to input.mp4 Where black lands in the red channel (0-1); green and blue lift a little less so shadows stay brown: 0.10 Color left after the grade: 0.75
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.
Add a 70s film look to @clip1.mp4, put a sale badge on @clip2.mp4, give @clip3.mp4 a VHS look, then join all three with crossfades.
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 |
|---|---|---|
FADE | 0.10 | Where black lands in the red channel (0-1); green and blue lift a little less so shadows stay brown. Higher looks more washed out. |
SATURATION | 0.75 | Color left after the grade. 1 keeps it all; 70s film stock looks a little muted. |
GRAIN | 8 | Moving film grain. 0 turns it off; 15 looks like a worn print. |
VIGNETTE | 0.4 | Corner darkening, as an angle in radians. 0 turns it off; larger darkens the corners more. |
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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Give all of input.mp4 a 1970s film look from the first frame to the last: warm brown-orange color, faded blacks, soft highlights and film grain. Using ffmpeg, apply per-channel tone curves (input/output points, 0-1): red 0/0.10 0.5/0.64 1/0.98, green 0/0.08 0.5/0.47 1/0.82, blue 0/0.05 0.5/0.30 1/0.58 (curves=r='0/0.10 0.5/0.64 1/0.98':g='0/0.08 0.5/0.47 1/0.82':b='0/0.05 0.5/0.30 1/0.58'). Then lower the saturation to 0.75 (eq=saturation=0.75), add moving grain (noise=alls=8:allf=t) and a light vignette (vignette=angle=0.4). The cool blue-white backdrop (around RGB 193, 201, 214) should come out a dusty amber-tan (around RGB 180, 150, 112), nothing should be darker than about RGB 25, 25, 25 or brighter than about 200, and the overall brightness should drop to roughly 80% of the original. Don't add any text (if you ever do, draw it with Pillow, not ffmpeg's drawtext). Keep the size (540x960), 30fps, the 6 second length and the audio. Encode H.264 yuv420p and save it as output.mp4.Run it without Claude
This is the exact command we tested. Save it as 70s-film-look.sh and run:
sh 70s-film-look.sh input.mp4 output.mp4Show the command
#!/bin/sh
# 70s film look: warm brown-orange color, faded blacks, softened contrast and grain, like a 1970s film print.
# Usage: sh 70s-film-look.sh input.mp4 output.mp4
# Needs ffmpeg.
set -e
IN="$1"; OUT="$2"
FADE=0.10 # where black lands in the red channel (0-1); higher looks more washed out
SATURATION=0.75 # color left after the grade (1 keeps it all); 70s stock looks a little muted
GRAIN=8 # moving film grain; 0 turns it off, 15 looks like a worn print
VIGNETTE=0.4 # corner darkening angle in radians; 0 turns it off, larger darkens more
# Per-channel tone curves: red lifted and kept high, green a little lower, blue pulled down hard,
# so whites turn cream, shadows go warm brown and the cool backdrop turns amber.
# Black lifts to FADE in red and a little less in green and blue, so shadows fade to brown, not gray.
ffmpeg -y -v error -i "$IN" -vf "curves=r='0/$FADE 0.5/0.64 1/0.98':\
g='0/0.08 0.5/0.47 1/0.82':b='0/0.05 0.5/0.30 1/0.58',\
eq=saturation=$SATURATION,noise=alls=$GRAIN:allf=t,vignette=angle=$VIGNETTE,fps=30,format=yuv420p" \
-c:v libx264 -crf 18 -c:a copy "$OUT"
