Helping someone who has a dash-mounted cam that they record videos in portrait mode. Advised to use landscape and they will but have some videos they need converted as they play on their side when copied to PC. Installed vlc player for them and was able to rotate the videos 90 degrees, but from what I understand this doesn't actually change the properties of the file and if they copy it to another PC it will be sideways. Anyone have an app or know a way to convert it to where the .mpeg4 will play correctly rotated on any pc? The other pc's it might be played on, may not have anything other than windows media player and he will not be able to install anything like movie maker or vlc to rotate it. Advise?