Rotate mp4 videos without re-encoding

Question

I\'m looking for a way to rotate videos shot with my Nexus 4 on my Debian Wheezy sytem. The videos are shot in portrait mode and I would like to rotate them to landscape mod

Answer 1

Rotation=0 fixed my issue. I started recording video in portrait mode, realized my mistake and immediately turn my phone to landscape to continue recording. My iphone had marked the video as portrait for the entire video.

ffmpeg -i input.mp4 -c copy -metadata:s:v:0 rotate=0 output.mp4

Fixed it.