Rotate videos

Rotate videos using ffmpeg by transposing them. The command to do so is:

$ ffmpeg -i input.mp4 -vf "transpose=1" output.mp4

The possible rotations are the following.

0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip

Use -vf "transpose=2,transpose=2" for 180 degrees.

Credits go to stackoverflow.com/a/9570992/1843020