thankyouverymuch! ran into the whole exporting/syncing issue with slow-mo films and this app does exactly what i needed, free to boot! great to learn it’s a promo from the slick glif folks (bought original one on kickstarter = iphone 6s is jealous of the new design). only advice i can offer is to give a subtle gray line to help guide us at which % changes we need to turn 240fps footage to 30fps = 12.5%. had to do a quick calculation to learn that. also useful if i could drag the line = keeping points as they are but moving together.
FFD8 about Slow Fast Slow - Control the Speed of Your Videos