import os mainFolder = '/dosya/konumu/videolar' mp4Count = len([name for name in os.listdir(mainFolder) if os.path.isfile(os.path.join(mainFolder, name))]) for i in range(1, mp4Count+1): result = os.system('ffmpeg -i ' + mainFolder + '\\' + str(i) + '.mp4 -vf fps=1 ' + mainFolder + '\\screenshots\\' + str(i) + '.jpg') print(result)