Decimate function (Native fps restore)

Just a GUI part for ffmpeg decimate. To restore 24/25 fps from 30 fps DVD. This is necessary because 25/24 frames per second is often recorded on an NTSC DVD with frame duplication and it is possible to return normal smoothness to movement only with the decimate function. Ideally, this function should view the video, count the number of unique frames, calculate the native fps and, after removing duplicate frames, set this this native fps to the output. It is better to put this processing first. Thanks )