If you want to rotate video clips recorded by your phone, Video Rotator is the best choice.
Website: https://www.videorotator.com/
Download: VideoRotator-4.3.zip
It supports iPhone/iTouch MOV format and Smart Phone MPEG4 format.
Video Rotator rotates videos 90/180/270 degrees, and also rotates videos Horizontal or Vertical mirror.
If the original video is upside-down, the program can flip it vertically.
Maybe you want to convert other video format videos to MP4, AVI, FLV, MOV and MPG files. Select Rotate option to [None], and the program will not rotate but only convert.