Use Handbrake

First pick type 720 not 1980 (only then do the other settings below)

Web optimise

Video quality 30 or so (not 22)

Protected PDF: See https://www.labnol.org/software/remove-pdf-password/20017/

Renderable text: https://helpx.adobe.com/acrobat/kb/error-could-perform-recognition-acrobat.html

Converting to TIFF and back to PDF is not very difficult. Very simple, really.

STEP 1: Powerpoint uses the Windows Default recording device as it’s input. This is A HIDDEN FEATURE AND SO SOUND WON’T RECORD AUTOMATICALLY DURING VIDEO CAPTURE.

So go to control panel > sound > manage audio devices > Recording. Pick “stero mix” which has the image of a sound card as the default device.

STEP 2: Go to insert > screen recording > record. Then Windows + Shift + Q to stop

STEP 3: Don’t forget to turn off the “stereo mix” default option