# Usage: ZEROES=9 make number-audio
# e.g. A million has six zeroes (3 * (1 + 1)).
# A billion has nine zeroes (3 * (2 + 1)).
# A trillion has 12 zeroes (3 * (3 + 1)).
number-audio:
	rm -f output.wav
	rm -f test-list.txt
	echo "file static/one.wav\n" > test-list.txt
	for i in {1..$(ZEROES)}; do printf "file 'static/zero.wav'\n" >> test-list.txt; done
	ffmpeg -f concat -safe 0 \
	-i test-list.txt \
	-c copy output.wav

convert-to-video:
	rm -f video.mp4
	ffmpeg -loop 1 -i static/base.png \
	-i output.wav -c:a aac -ab 112k \
	-c:v libx264 -shortest -strict -2 -pix_fmt yuv420p \
	video.mp4