Generates thumbnail contact-sheets of all video files in the current working directory

videoContactSheet.sh

#!/bin/bash
#
# Generates thumbnail contact sheets of all video files in current working directory. 
#
# Script defaults to writing PNG contact sheets to the same folder, using the original 
# video filename as the basename for the contact sheet
#
# More details: https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video
#
# NOTE: 'montage' requires that Ghostscript be installed, in order to be able to generate titles
# on the contact sheet: run 'brew install ghostscript' to install


function cleanup () {
	
	rm -rf .snapshots/*
}

SNAPSHOT_INTERVAL="15" # time interval (in seconds) to grab each frame


if [ ! -d ".snapshots" ] # check for existence of screengrab temp folder in CWD
  then mkdir .snapshots
fi

shopt -s nocaseglob 	# forces case insensitive extension globbing in the following for loop

for FILE in *.{wmv,avi,rm,ram,mpg,mpeg,mov,mp4,flv,asf};

	do [ -e "$FILE" ] || continue; 

		trap cleanup SIGHUP SIGINT SIGTERM 		
		# extract thumbnail frames every $SNAPSHOT_INTERVAL seconds. By telling FFmpeg to set the output files FPS option to
		# a very low value, we made FFmpeg drop a lot of frames at the output, in order to achieve such a low frame 
		# rate, effectively having our thumbnails generated every X seconds
		#
		# thumbnails are written to a hidden .snapshots temp folder in the same folder the script was run in.
		
		echo "------------------------------------------------"
		echo -e "\nExtracting thumbnails for \"${FILE}\"" 
		ffmpeg -loglevel warning -i "${FILE}" -f image2 -vf fps=fps=1/$SNAPSHOT_INTERVAL .snapshots/._"${FILE}"_%03d.png 2> /dev/null 
		
		# assemble the contact sheet, using ImageMagick's "montage" util
		
		echo -e "Compiling contact sheet for \"${FILE}\""
		montage .snapshots/"._${FILE}"_*.png -geometry +3+1 -title "${FILE}" "${FILE}.png" 
		
		# purge the temporary .snapshots folder

		echo -e "Cleaning up tempfiles...\n"
		rm -f .snapshots/._"${FILE}"_*.png 

	done 

hi, thank you for this script, i have a problem when adapting it to check each subdirectories:

for d in *; do
#if [ -d "$d" ]; then
( cd "$d" && LINE 28 here)
fi
done

how can i adapt this to my need ?

A bit late, but still:

To search also in subfolders:

shopt -s globstar  # expand double asterisk to any number of directories
for FILE in **/*.{wmv,avi,rm,ram,mpg,mpeg,mov,mp4,flv,asf};

also extract just the name of the video file to be used when saving/merging images:

NAME="${FILE##*/}"

and use it in lines 41, 46, 51: replace _"${FILE}"_ with _"${NAME}"_