If this type of application interests you, have a look at: https://savannah.nongnu.org/projects/kinetophone https://savannah.nongnu.org/projects/kinetophone I

If this type of application interests you, have a look at: https://savannah.nongnu.org/projects/kinetophone https://savannah.nongnu.org/projects/kinetophone It is an application/shared library for Linux, released as free software. It has a GUI program for live narration and one, "Vox", for creating video from PDF or still images using speech synthesis (Festival). http://download-mirror.savannah.gnu.org/releases/kinetophone/Kinetophone_vox_tutorial.pdf http://download-mirror.savannah.gnu.org/releases/kinetophone... The Kinetophone shared library could be used as a plug in for presentation software. Kinetophone's file format is XML. I haven't updated it for years, and it does require occasional patches to support the latest FFMPEG. It was originally a commercial application for OS X called Ishmael, back in about '07 which I ported to Linux after my company went out of business.