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ffmpeg -i input.mp4 -vf transpose=2 output.mp4

* 0 = 90° counter-clockwise and vertical flip (default)
* 1 = 90° clockwise
* 2 = 90° counter-clockwise
* 3 = 90° clockwise and vertical flip

ffmpeg -i input.mp4 -ss 00:00:00.200 -c:v copy -c:a copy output.mp4