ffmpeg -i input.mp4 -vf "transpose=1" output.mp4
transpose=
0 = 90 degrees counterclockwise and vertical flip (default)
1 = 90 degrees clockwise
2 = 90 degrees counterclockwise
3 = 90 degrees clockwise and vertical flip
一般都用 1 或 2, 0 跟 3 是加上鏡射反轉
ref. FFmpeg transpose
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