Hi Dwight , VLC video player is maybe an option.
It play almaos all video formats.
Slow down options too
There's a repeat button
You can the part you want to repeat set from A to B
And it's a free one.
I think most people use Amazing Slow Downer, it's not free, but it has the interface that's easiest to use.
Audacity is free, not quite so user friendly, in my opinion.