ffmpeg commands

ffmpeg.sh

# compress to 960:540 and reduce framerate to 30fps
ffmpeg -i input.mp4 -vf "fps=30,scale=960:540" output.mp4

# cut fragment from 3 sec to 8 sec
ffmpeg -i input.mp4 -ss 00:00:03 -t 00:00:08 -async 1 -c copy fragment.mp4 

# concat files: create list and compress
for %%i in (*.mp4) do echo file '%%i'>> mylist.txt
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

#reverse only video
ffmpeg -i input.mp4 -vf reverse output.mp4

#reverse video and audio
ffmpeg -i input.mp4 -vf reverse -af areverse ouptput.mp4

# flip video horizontally
ffmpeg -i input.mp4 -vf hflip -c:a copy output.mp4

# generate one image every second, named out1.png, out2.png, out3.png, etc.
ffmpeg -i input.mp4 -vf fps=1 out%d.png

# generate one image every minute, named img001.jpg, img002.jpg, img003.jpg, etc. The %03d dictates that the ordinal number of each output image will be formatted using 3 digits.
ffmpeg -i myvideo.avi -vf fps=1/60 img%03d.jpg

# generate one image every ten minutes:
ffmpeg -i test.flv -vf fps=1/600 thumb%04d.jpg

# generate single image with screenshots
ffmpeg -i input.mp4 -vf select='gt(scene\,0.4)',scale=160:120,tile -frames:v 1 preview.png
ffmpeg -ss 00:00:10 -i movie.avi -frames 1 -vf "select=not(mod(n\,1000)),scale=320:240,tile=2x3" out.png