Make a gif from a video
ffmpeg -i movie.mov -vf "scale=iw/3:ih/3" -pix_fmt rgb8 -r 15 output.gif && gifsicle -O3 output.gif -o output.gifMov to mp4
ffmpeg -i movie.mov -vf "scale=iw/2:ih/2" -vcodec libx264 -crf 28 -preset medium -acodec aac -b:a 128k output.mp4