import subprocess
import os
 
def callFFmpeg(ffmpegCmd):
            subprocess.call(ffmpegCmd, shell=True)
 
if __name__ == "__main__":
    ffmpegCmd = "ffmpeg -ss 0 -t 3 -i <input-path> -vcodec libx264 -s 640x360 -y <output-path>  2>&1"
    callFFmpeg(ffmpegCmd)