Shell script to convert .mov video files into 5x speed, optimized GIFs using ffmpeg with palette generation for quality and size efficiency.

make_gif_5x.sh

#!/bin/bash

# make_gif_5x.sh
# Convert a .mov file into an optimized 5x speed animated GIF using ffmpeg and palette method.

# Usage:
#   ./make_gif_5x.sh input.mov

INPUT="$1"
BASENAME=$(basename "$INPUT" .mov)
FPS=10
SCALE=1000
SPEED=5
PTS=$(awk "BEGIN{print 1/$SPEED}")

if [[ -z "$INPUT" ]]; then
  echo "❗ Usage: $0 input.mov"
  exit 1
fi

echo "🎞️  Input: $INPUT"
echo "⚡ Speed: ${SPEED}x | FPS: ${FPS} | Width: ${SCALE}px"

# Step 1: Generate color palette
ffmpeg -i "$INPUT" -filter_complex \
"[0:v]setpts=${PTS}*PTS,fps=${FPS},scale=${SCALE}:-1:flags=lanczos,palettegen" \
-y palette.png

# Step 2: Generate GIF using the palette
ffmpeg -i "$INPUT" -i palette.png -filter_complex \
"[0:v]setpts=${PTS}*PTS,fps=${FPS},scale=${SCALE}:-1:flags=lanczos[x];[x][1:v]paletteuse" \
-y "${BASENAME}_${SPEED}x.gif"

# Cleanup
rm -f palette.png

echo "✅ Done: ${BASENAME}_${SPEED}x.gif"