Shotcut is a free, cross-platform, open source video editor: https://shotcut.com
Developer Brian explains how he uses the Timer filter he added that is available as of v18.09
On this page of the site you can watch the video online Shotcut Tutorial: Timer Filter with a duration of hours minute second in good quality, which was uploaded by the user Shotcut 14 September 2018, share the link with friends and acquaintances, this video has already been watched 50,636 times on youtube and it was liked by 518 viewers. Enjoy your viewing!