Sometimes you capture yourself with the front camera on your phone and get flipped video. If you need to flip it back, you can simply do this with ffmpeg application.
Option #1: To Flip Video Vertically
Use the command to flip the video vertically.
ffmpeg -i input_video.mp4 -vf vflip -c:a copy output_video.mp4Option #2: To Flip Video Horizontally
Use the next command to flip the video horizontally.
ffmpeg -i input_video.mp4 -vf hflip -c:a copy output_video.mp4