Insanely specific script for generating screenshots of all mp4 files in a directory using ffmpeg. Creates named directory for each file's screenshots.

mp4_screens.sh

# for each mp4 file in current directory
for FILE in *.mp4
do
	# get name of file sans the extension
	NAME=${FILE%.*}

	# make directory with file name
	mkdir $NAME

	# generate screens: currently 4 screens per second, starting at 1 second, for 5 seconds.
	ffmpeg -i $FILE -r 4 -ss 00:00:01 -t 00:00:05 -f image2 $NAME/$NAME%05d.png
done