Last Updated or created 2025-02-12

(Improvement of previous posted script)

Place below bash script in a subdir with media.

Animated GIFs are generated from the video files.
You can set the number of frames per length

#!/bin/bash
#set -x
mkdir -p tmp prev
: > list
: > index.html
find ../ -type f -print | egrep -i "mp4$|wmv$|avi$|mpg$|mpeg$|flv$|mov$|divx$"  > list

cat list | while read movie; do 
	rm -f tmp/*
	newname=$( echo $movie | tr -d ' /.[]{}()' ) 
	if [ ! -f prev/${newname}.gif ] ; then

		echo "Filename : $movie"

		kseconds=$( mediainfo --Inform="Video;%Duration%"  "$movie" )
		minutes=$(( $kseconds / 60000 ))
		echo "Minutes : $minutes"
		if [ $minutes -gt 10 ] ; then 
			rate=0.032
		else
			rate=0.128
		fi
echo "ffmpeg -hide_banner -loglevel error -i $movie -r $rate  -vf scale=640:-1 tmp/output_%04d.png"
		ffmpeg -hide_banner -loglevel error -i "$movie" -r $rate  -vf scale=640:-1 tmp/output_%04d.png < /dev/null
		# remove first (most of the time just black or logo)
		rm tmp/output_0001.png
		echo -n "Frames : "
		ls tmp/out* | wc -l
		convert -delay 50 -loop 0  tmp/output*.png prev/${newname}.gif
	else
		echo "$movie exists ... skipping"
	fi
	echo "<h1>${movie}</h1><br>" >> index.html
	echo "<img src=\"prev/${newname}.gif\"><br>" >> index.html
done
exit 0

run and get something like below (output is still running as I made this post)