Using mencoder:
- To rotate by 90 degree clockwise
- mencoder -vf rotate=1 -o output.mp4 -oac pcm -ovc lavc -fps 30 -ofps 30 input.mp4
- It is important to specify both input and output frame rate (with fps, ofps), else you will get the error.
- To flip horizontally
- mencoder -vf flip -o output.mp4 -oac pcm -ovc lavc -fps 30 -ofps 30 input.mp
Using ffmpeg
- To rotate the video by 90 degrees, we can use the following command
- ffmpeg -i input.mp4 -vf "transpose=1" output.mp4
- "transpose=1" => 90 degree clockwise
- "transpose=2" => 90 degree anti-clockwise
- You may get the following error while running the command-"No such filter: 'transpose'". In this case, you should you need to install Libavfilter.
- To vertically flip the video
- ffmpeg -i input.mp4 -vf vflip output.mp4
- To horizontally flip the video
- ffmpeg -i input.mp4 -vf hflip output.mp4
