convert vtt transcript to plain text

strip_vtt

#!/bin/bash
set -e

# Convert vtt transcript to text

# For use with e.g. youtube-dl --write-auto-sub --skip-download $URL

tail -n +4 |  sed 's/<c>//g' | sed 's/<[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9]>//g' | sed 's/<\/c>//g' | sed '/[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9] --> [0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9] align.*/d' | sed '/^\s*$/d' | uniq