A simple script to create a timer video at any acceleration speed:
timer1.mp4
timer.mp4
# create a timer from 00:10 to 00:00 (count down), with red text and grey background, save to default timer.mp4
python mih_timer.py --start 00:10 --end 00:00 --fg_color red --bg_color grey
# create a timer from 00:00 to 01:00 (count up), with 10x acceleration, save to timer1.mp4
python mih_timer.py --start 00:00 --end 01:00 --speedup 10 --out timer1.mp4
# find out more options by:
python mih_timer.py --help