Editing - Speed adjustment

Above is a clip that I created while editing. I was playing around with the speed adjustment on our clips and I embedded the ones that I wanted to use for our final music video. In the above clip I speed up the cars that we filmed in South bank and then slowed it down when the ambulance and I also slowed down parts of the tube when it travelled closer to the camera. In the end I did not adjust the speed on the clips of the tube but I did speed up the footage of the cars and and slowed down a couple of clips of our artists.