Picture slideshow with subtitles over Whatsapp

There are several problems, if you want to make a picture slideshow, which shall be transmitted through Whatsapp:

  • You need a Whatsapp compatible video format.
  • Pictures may have different formats / resolutions.
  • Smart-phone displays have wide screens.
  • Whatsapp's upper bound of a video's file size is 16MB.
  • How to make subtitles?

In what follows, you will find my quick and dirty solution. Note that you need Linux with GNU parallel, ImageMagick, and ffmpeg installed.