How to: Rotate a video in linux

For the life of me I can't figure out how to flip/rotate a video in linux using any GUI apps

Here's the commandline way to do it

mencoder -ovc lavc -vf rotate=2 -oac copy INPUT.AVI -o OUTPUT.AVI

The rotate=2 can be replaced with whatever option best suits your needs. Rotating video options are below:

0 Rotate by 90 degrees clockwise and flip (default).
1 Rotate by 90 degrees clockwise.
2 Rotate by 90 degrees counterclockwise.
3 Rotate by 90 degrees counterclockwise and flip.