#!/bin/dash
# $1-path to source, $2-path to output, $3-pixel size 

exec ffmpeg -filter_complex "color=white:s=${3}x${3},drawtext='x=(w-text_w)/2:y=(h-text_h)/2:fontfile=$1:fontsize=h/2:fontcolor=black:text=Aa'" -r 1/1 -t 1 "$2" 2>/dev/null
