You can rotate videos in GOM Player, but before you can do that, you have to make sure that the latest version of the player has been installed on your computer. Firstly, download the latest version and update the current one installed on your computer, and then you can rotate the playing file by 90, 180, and 270 degrees using Ctrl] + [Shift] + [S] key combination.
To find additional information about this, access the following page: http://player.gomlab.com/faq_view.gom?seq=204
Download the latest version: http://player.gomlab.com/download.gom?language=eng
