User:Jan Honvehlmann/ffmpeg-unrotate
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Undo the damage of starting to film vertically, without re-encoding:
ffmpeg -i video.mp4 -map_metadata 0 -metadata:s:v rotate="" -codec copy video.rotated.mp4
If held with home button on the left side:
ffmpeg -i video.mp4 -map_metadata 0 -metadata:s:v rotate="180" -codec copy video.rotated.mp4