A meme generator based on code of esmBot

meme-generator.sh

#!/bin/bash
# This script is based on esmBot caption command. See code here: https://github.com/esmBot/esmBot/blob/master/natives/caption.cc
# It needs ffmpeg + ffprobe + vips installed. The meme is created with dark mode caption
# I used vips 8.13 and ffmepg build of 2022-06-16
# It must be used like this: bash meme-generator.sh template.png "my caption of meme"
# Font is also available at https://github.com/esmBot/esmBot/blob/master/assets/caption.otf
WIDTH=$(ffprobe -v error -select_streams v -show_entries stream=width -of csv=p=0:s=x "$1")
FONT_SIZE=$((WIDTH/10))
vips text caption.png "<span foreground=\"white\" background=\"black\">$2</span>" --width $WIDTH --font "futura bold $FONT_SIZE" --align centre --rgba
ffmpeg -i caption.png -vf "pad=$WIDTH:ih+$FONT_SIZE:(ow-iw)/2:(oh-ih)/2" caption2.png
OUTPUT_NAME="output."
FPS=""
if [[ "${1##*.}" == "mp4" ]]; then
	OUTPUT_NAME+="mp4"
	FPS=$(ffprobe -v error -select_streams v -of default=noprint_wrappers=1:nokey=1 -show_entries stream=r_frame_rate "$1")
	FPS=$(($FPS))
	FPS="-r $FPS"
	echo "FPS IS $FPS"
else
	OUTPUT_NAME+="png"
fi
ffmpeg $FPS -i caption2.png -i "$1" -filter_complex vstack "$OUTPUT_NAME"
rm caption.png caption2.png