A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
thank you. None of those things worked. What did seem to work is a Reset BIOS to defaults (I have a HP Spectre x360 laptop).
I was working on another issue - i.e. no audio from laptop, while it hasn't fixed my audio, PPT MP4 files are now working!!
Now I just have to fix my laptop audio....