I'm analysing a dashcam video clip (avi format) frame by frame. According to media information when I open this video file, the frame rate is 30 fps. However I noticed that every sixth frame is actually a repeat of the fifth frame, like as if it is 25 fps. What the reason why and how I can I get rid of the duplicate frames? Was it actually 25 fps but saved as 30 fps? Any tips? Thanks.