A moviepy script that flips an input video file and optionally accelerates/decelartes it

mirror.py

import sys

from moviepy.editor import VideoFileClip
import moviepy.video.fx.all as vfx


def main(fname_in, fname_out, duration="1.0"):
    duration = float(duration)
    clip = VideoFileClip(fname_in)
    clip = (clip
            .fx(vfx.accel_decel, new_duration=clip.duration * duration)
            .fx(vfx.mirror_x)
            )
    clip.write_videofile(fname_out)


if __name__ == '__main__':
    main(*sys.argv[1:])