either you take out the two frames manually or check up what it gives if you stick all the frames together (4 frames a second), lets say you have 15 seconds of footage=15*4=60 frames - you want al this frames in 1 second as yo need only the half of the frames. So you put the clip speed on 1500% and then you make sure you have the video setting on 30fps.(posted 8929 days ago)