This script re-encodes the seconds between second 25 and 45 of an input.mov video from mov to mp4; rotates the frames 180 (the hflip,vflip flags flip all pixels vertically and horizontally); removes the audio (with the -an flag); and speeds up the video (i.e., skips frames, with the flag setpts=0.05*PTS, which you could adjust to have more frames, for instance, as setpts=0.1*PTS).
ffmpeg -ss 00:00:25 -to 00:00:45 \
-i "input.mov" \
-an -filter:v "hflip,vflip,setpts=0.05*PTS" \
"output.mp4"