This app can change the playing speed of the frames you selected in videos.
( It is not that app play a different speed but app make new video changed the speed. )

For the scenes not so much important, speed up decrease attention.
For the important scenes, slow play increase attention.

This app can
- change the playing speed from 1/10 to 10 times faster.
- change any frame you selected. And the changed frame can be overwritten on or be inserted after the selected original frame.
- embed text to video like '2X▶▶', 'Slow ▶'.
- change the font, color, font size, alignment.
- can save the created video to Photo app.
- support Photo Editing Extension, so you can choose and edit videos from Photo app.