So still editing my video, when I played it fully there was a section that had a frame drop. As previous I did a process of elimination to find the source of the problem. So nothing worked so I guess it was the video encoding again. However this wasn’t the case. It just dropped its frames every time the section played. So I learned something when I was using the effect ‘Morph cut’ which I use to morph two bits of video together for a more natural transition, to do this well though I have to mark an in and out point where the effect is and render this in-out section. So I did this to the section that had a frame drop and it fixed the problem.