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Trim
ffmpeg -ss [start] -to [stop] -i in.mp4 -c copy out.mp4
Crop
ffmpeg -i in.mp4 -vf "crop=out_w:out_h:x:y" out.mp4
Mirror
ffmpeg -i in.mp4 -vf vflip -c:a copy out.mp4
Rotate
ffmpeg -i in.mp4 -vf "transpose=1" out.mp4
… Not gonna lie - its nice to also have a GUI for this!