How to Use Handbrake to Flip or Rotate Video 90/180/270 Degrees?

Problems to rotate video with Handbrake "I record a lot of videos on my iPhone, and sometimes I forget about proper orientation and end up recording "upside down" or vertically. I am looking for a utility that can covert the .mov files to .mp4 with the ability to rotate the orientation during the conversion process. I use Handbrake but I've found that many of the files I've converted will displ...
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