Jan 14 2018 04:05 PM - edited Jan 14 2018 04:07 PM
I haven't seen any functionality in Office Mix or PowerPoint Recording that allows for more than a TRIM of the video.
I would suggest:
1. Exporting/saving the video into a file format.
2. Using another app to crop the sections of the video that you don't want.
3. Save each edit as individual files.
4. Merge them together.
5. Import back in PowerPoint.
Easy Movie Maker on Microsoft Store let's you do some good things with the free version. Maybe have a play?
Feb 06 2018 07:46 AM - edited Feb 06 2018 07:46 AM
You're absolutely right on this. PowerPoint's video editing abilities are pretty basic right now. You can't clip a segment from the middle of a recorded video without using a third-party video editing program, but here's something that might let you achieve more-or-less the same effect in PowerPoint:
On playback, the seek will be instantaneous, so the effect will be a jump across the middle of the video. However, please be aware that bookmarks cannot be moved, only deleted, and that will wreck your triggers. Also, the file still technically contains the cut segment, so it won't be any smaller. And other timings, such as a slide transitions, won't reflect the shorter duration of the video, which may make other animation sequences harder to plan.
In short, it's often easier just to edit the video outside of PowerPoint or reshoot to remove the goof.
Microsoft could do a lot to make this easier to use with better UI in PowerPoint, or a dedicated video editor. PowerPoint is a great tool for animation, but is woefully lacking for producing polished video.