A week ago I was piloting my Phantom 4 Adv with a camera set strictly for navigation yet still recording. During post flight video review, I caught what looked like a bug or bird coming at the camera very fast. Reviewing the vid closer and slower allowed me to locate their position and synch it to the flight log. It showed 2 objects traveling over 1,000' in 1/2 second. I just uploaded the Zapruder. It's 1080/60fps. Try to view it with the best resolution and biggest screen.