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