Can you please tell HOW this video demo slide was created, because there are two ways:
- By using the big button Slides, Video Demo. In that case the Video Demo slide is recorded based on a Blank master slide, and using the theme and resolution (size) of the project. You can access the Video Demo editor from that slide.
- By using the Insert menu, CPVC slide. In that case the video demo was recorded as a standalone cpvc project.
In the second scenario you'd better open the standalone cpvc project and publish it. The only possible output is MP4 in that case.
In the first scenario, hide all slides except the Video Demo slide and publish to Video.
