I did some quick testing. On my iPhone 15 pro it did not crash as some reported. But the app did create a video file that has audio backed in at 2x the speed.

I did some quick testing. On my iPhone 15 pro it did not crash as some reported. But the app did create a video file that has audio backed in at 2x the speed. So halfway true the video the audio stops already. I guess this is an interesting app to keep eyes on after a few updates.