This tutorial is intended to supplement the Understanding PowerPoint Accessibility article. Placeholders in PowerPoint allow you to add text or multimedia content to a slide. Adding a text box (Home > ...

Then we simply specify a subtitle file of the format .ass(Advanced Substation Alpha), and feed it to ffmpeg as follows: ffmpeg -y -i original.mp4 -vf subtitles=text.ass original_with_subs.mp4 and this ...