![]() ![]() We’re flipping the video by 90° clockwise twice. Let’s combine two transpose filters, each with a value of 1 for a 180° flip: $ ffmpeg -i big_buck_bunny_720p_1mb.mp4 -vf "transpose=1, transpose=1" output_transpose_multiple.mp4 The clockwise rotation usually is indicated by the negative sign on magnitude. ![]() The most common rotations are usually 90, 180 and 270. We can also combine multiple transpose filters to change the orientation of the video. You can find both the Clockwise and AntiClockwise directions of rotation by the rotation calculator. ![]() We’ll get this output when playing the output_0.mp4 video: This is the default preset if we don’t pass any values to transpose. Rotate the rectangle ABCD 90° clockwise about the point (0,-1). If you represent the point ( x, y) in the plane as a complex number x + i y, then multiplying it by i rotates it 90 counterclockwise and multiplying it by i rotates it 90 clockwise. The centre of rotation may not be at the origin. So rotating ( x, y) by 90 degrees gets you ( y, x). This will change the video orientation to portrait. Trig rules tell you that this is the same as ( sin t, cos t) ( y, x). We’re passing the value 0 to the transpose filter which rotates the video counterclockwise and vertically. Video:1040kB audio:229kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.406613% $ ffmpeg -i big_buck_bunny_720p_1mb.mp4 -vf "transpose=0" output_0.mp4 ![]()
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