https://filme.imyfone.com/video-edit-tutorials/ffmpeg-flip-video/
Step#1: To Flip Video Vertically
Use the command line to vertically flip the video.
ffmpeg -i INPUT.mp4 -vf vflip -c:a copy OUTPUT.mp4 Step#2: To Flip Video Horizontally
Input following command line to ffmpeg flip video horizontally.
ffmpeg -i INPUT.mp4 -vf hflip -c:a copy OUTPUT.mp4
Can u do multiple video or folder flip ?