Can't believe it was me that wrote this.
TEXT: http://icopiedyou.com/nor-theory-kenn...
How to? Balabolka for TTS.
First, create showcqt from text-to-speech audio file:
ffmpeg.exe -i ..\Documents\NOR-theory.mp3 -filter_complex "showcqt=s=1280x720:fps=30" -c:v libx264 -c:a aac nor-graph.mp4
Now, add prepared text (wordwrapped to about 70 per line or so in a file, I called CREDITS.txt)
ffmpeg -i 636.mp4 -vf drawtext="fontsize=20:fontcolor=yellow:fontfile=arial.ttf:textfile=CREDITS.txt:y=h-7.5*t" -c:v libx264 -t 396 636_done.mp4