Code:
ffmpeg -ss 00:00:10 -t 00:00:20 -i infile.mp4 -c:a copy -c:v copy outfile.mp4
You want to turn the video upside down, or mirror image?
Code:
ffmpeg -i infile.mp4 -vf "transpose=1"...outfile.mp4
0 = 90CounterCLockwise and Vertical Flip
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip
-vf "rotate=PI/1"
-vf "rotate=PI/2"
-vf "rotate=PI/3"
-vf "rotate=PI/4"
And, you can use them in combos.