I am using FCPX thought I doubt the problem is restricted to this. I am trying to edit some footage from a VIO POV HD camera. It is recorded at 1080 30p I have imported the media and put a section onto an empty timeline. When I do this FCPX asks me to confirm the format of the video because it can't be sure. I tell it it's 1080P 30fps. If I step through the video frame by frame, about 4 times a second I see the same frame twice. If I watch the same source media in Quicktime and step through frame by frame, it works as you would expect. i.e. I press the arrow 30 times I see 30 different frames. What would cause this? EDIT: I have tried creating optimised media as it imports. This does not help at all, I still get the duplicated frames.