Render text overlays for use with the Blender Video Sequence Editor

render_texts.sh

#!/bin/bash
#
# Renders text captions for videos; targeted at Blender usage.
# Usage: ./render.sh
#
# Copyright © 2018 Hugo Locurcio
# Licensed under CC0 1.0 Universal: https://creativecommons.org/publicdomain/zero/1.0/

set -euo pipefail
IFS=$'\n\t'

# Read entries from a file (one per line)
texts_file="texts.txt"

echo "Removing old images…"
rm -f *.png

while read -r text; do
  output="$(echo "$text" | sed "s/\\( \\|'\\|:\\)/_/g").png"

  echo -e "Rendering \e[1m$text\e[0m…"

  convert \
    -size "1920x1080" \
    xc:none \
    -fill "hsla(250, 65%, 12%, 0.8)" \
    -draw "rectangle 0,880,960,1000" \
    -fill "white" \
    -gravity "SouthWest" \
    -font "Montserrat-SemiBold" \
    -interword-spacing "18" \
    -pointsize "56" \
    -draw "text 85,105 \"${text^^}\"" \
    "$output"
done < "$texts_file"

echo -e "\e[1;32mDone rendering.\e[0m"