Shell scripts for creating thumbnails from video files

create-thumbnails.sh

# Author: Cifro Nix, http://about.me/Cifro
#
# usage:
# ./create-thumbnails.sh 
# will produce thumbnails with name "<id>.jpg" with size 220x122
#
# different size:
# ./create-thumbnails.sh 640x360 -big 
# will produce thumbnails with name "<id>-big.jpg" with size 640x360

videoDir=/var/www/data/videos
tnDir=/var/www/data/videos/.tn
tnSize=${1-"220x122"}
tnSuffix=${2-""}

for i in $videoDir/*.flv $videoDir/*.mp4 $videoDir/*.f4v; do
	# filename: <videoDir>/<id>_<yyyy-mm-dd>_<video-title>.<flv|mp4|f4v>
	vid=`echo "$i" 2>&1 | cut -d '_' -f 1 | cut -d '/' -f 6`;

    if [ -f "$i" ] && [ ! -f "$tnDir/$vid$tnSuffix.jpg" ]; then
		# get video duration, v1
		#ff=`$(ffmpeg -i "$i" 2>&1)`;
		#d="${ff#*Duration: }"
		#echo "${d%%,*}"

		# get video duration, v2
		fulltime=`ffmpeg -i "$i" 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//`;

		hour=`echo $fulltime | cut -d ':' -f 1`;
		minute=`echo $fulltime | cut -d ':' -f 2`;
		second=`echo $fulltime | cut -d ':' -f 3 | cut -d '.' -f 1`;


		seconds=`expr 3600 \* $hour + 60 \* $minute + $second`;
		ss=`expr $seconds / 2`; # from the middle of video
		#echo "$vid: $ss / $seconds";


		# create thumbnail from middle of video
		output=`ffmpeg  -ss $ss -i "$i" -f image2 -vframes 1 -s $tnSize "$tnDir/$vid$tnSuffix.jpg" 2>&1`;

		if [ -f "$tnDir/$vid$tnSuffix.jpg" ]; then
			echo "$(tput setaf 2)Thumbnail $tnDir/$vid$tnSuffix.jpg [$tnSize] saved$(tput sgr0)";
		else
			echo "$(tput setaf 1)Error: Thumbnail $vid$tnSuffix.jpg [$tnSize] was not saved$(tput sgr0)";
		fi
	else
		echo "$(tput setaf 6)Notice: Thumbnail $tnDir/$vid$tnSuffix.jpg already exists.$(tput sgr0)";
	fi
done

create-tn.sh

# Author: Cifro Nix, http://about.me/Cifro
#
# usage:
# ./create-tn.sh 232_2011_12_03-some-video-title.mp4 
# will produce thumbnail "232.jpg" with size 220x122
#
# different size:
# ./create-tn.sh 232_2011_12_03-some-video-title.mp4 640x360 -big 
# will produce thumbnail "232-big.jpg" with size 640x360
# fourth parameter is custom time in seconds, when will be thumbnail taken, default time is at half of video

videoDir=/var/www/data/videos
tnDir=/var/www/data/videos/.tn
tnSize=${2-"220x122"}
tnSuffix=${3-""}

# filename: <videoDir>/<id>_<yyyy-mm-dd>_<video-title>.<flv|mp4|f4v>
vid=`echo "$videoDir/$1" 2>&1 | cut -d '_' -f 1 | cut -d '/' -f 6`;

if [ -f "$videoDir/$1" ] && [ ! -f "$tnDir/$vid$tnSuffix.jpg" ]; then
	fulltime=`ffmpeg -i "$videoDir/$1" 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//`;
	hour=`echo $fulltime | cut -d ':' -f 1`;
	minute=`echo $fulltime | cut -d ':' -f 2`;
	second=`echo $fulltime | cut -d ':' -f 3 | cut -d '.' -f 1`;

	seconds=`expr 3600 \* $hour + 60 \* $minute + $second`;
	ss=`expr $seconds / 2`; # from the middle of video
	#echo "$vid: $ss / $seconds";

	#custom time from command line
	if [ "$#" -eq 4 ]; then
	    ss=$4;
	fi

	# create thumbnail from middle of video
	output=`ffmpeg  -ss $ss -i "$videoDir/$1" -f image2 -vframes 1 -s $tnSize "$tnDir/$vid$tnSuffix.jpg" 2>&1`;

	if [ -f "$tnDir/$vid$tnSuffix.jpg" ]; then
		echo "$(tput setaf 2)Thumbnail $tnDir/$vid$tnSuffix.jpg [$tnSize] saved$(tput sgr0)";
	else
		echo "$(tput setaf 1)Error: Thumbnail $vid$tnSuffix.jpg [$tnSize] was not saved$(tput sgr0)";
	fi
else
	echo "$(tput setaf 6)Notice: Thumbnail $tnDir/$vid$tnSuffix.jpg already exists.$(tput sgr0)";
fi

tn.sh

# Author: Cifro Nix, http://about.me/Cifro
#
# Script for generating thumbnails, called from PHP
#
# usage in PHP:
# $screenshot = trim(shell_exec("/var/www/bin/tn.sh $videofile &"));

videoDir=/var/www/data/videos
tnDir=/var/www/data/videos/.tn
preview="220x122"
standard="640x360"
hd="1280x720"

if [ -f "$videoDir/$1" ]; then
	# filename: <videoDir>/<id>_<yyyy-mm-dd>_<video-title>.<flv|mp4|f4v>
	vid=`echo "$videoDir/$1" 2>&1 | cut -d '_' -f 1 | cut -d '/' -f 6`;
	size=`ffmpeg -i "$videoDir/$1" 2>&1 | grep 'Video: ' | cut -d ',' -f 3 | cut -d '[' -f 1  | sed 's/^ *\(.*\) *$/\1/'`;

	fulltime=`ffmpeg -i "$videoDir/$1" 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//`;
	hour=`echo $fulltime | cut -d ':' -f 1`;
	minute=`echo $fulltime | cut -d ':' -f 2`;
	second=`echo $fulltime | cut -d ':' -f 3 | cut -d '.' -f 1`;

	seconds=`expr 3600 \* $hour + 60 \* $minute + $second`;
	ss=`expr $seconds / 2`; # from the middle of video
	#echo "$vid: $ss / $seconds";

	#custom time from command line
	if [ "$#" -eq 2 ]; then
	    ss=$2;
	fi

	# create thumbnail from middle of video
	# thumbnails will be allways overwrited
	output=`ffmpeg  -ss $ss -i "$videoDir/$1" -f image2 -vframes 1 -s $preview "$tnDir/$vid.jpg" 2>&1`;
	output=`ffmpeg  -ss $ss -i "$videoDir/$1" -f image2 -vframes 1 -s $standard "$tnDir/$vid-v.jpg" 2>&1`;

	# needs space, "trim" with sed regexp doesnt work well
	if [ "$size" == "$hd " ]; then
		output=`ffmpeg  -ss $ss -i "$videoDir/$1" -f image2 -vframes 1 -s $hd "$tnDir/$vid-hd.jpg" 2>&1`;
	fi

	if [ -f "$tnDir/$vid.jpg" ] && [ -f "$tnDir/$vid-v.jpg" ] && [ -f "$tnDir/$vid-hd.jpg" ] && [ "$size" == "$hd " ]; then
		echo "ok";
	elif [ -f "$tnDir/$vid.jpg" ] && [ -f "$tnDir/$vid-v.jpg" ]; then
		echo "ok";
	else
		echo "failed";
	fi
else
	echo "nonexists";
fi

tns.sh

# Author: Cifro Nix, http://about.me/Cifro
#
# Script for batch generating thumbnails.
#
# usage in PHP:
# ./tns.sh

videoDir=/var/www/data/videos
tnDir=/var/www/data/videos/.tn
preview="220x122"
standard="640x360"
hd="1280x720"

for i in $videoDir/*.flv $videoDir/*.mp4 $videoDir/*.f4v; do
	# filename: <videoDir>/<id>_<yyyy-mm-dd>_<video-title>.<flv|mp4|f4v>
	vid=`echo "$i" 2>&1 | cut -d '_' -f 1 | cut -d '/' -f 6`;

    if [ -f "$i" ] && [ ! -f "$tnDir/$vid.jpg" ] && [ ! -f "$tnDir/$vid-v.jpg" ]; then
		size=`ffmpeg -i "$i" 2>&1 | grep 'Video: ' | cut -d ',' -f 3 | cut -d '[' -f 1  | sed 's/^ *\(.*\) *$/\1/'`;

		# get video duration, v2
		fulltime=`ffmpeg -i "$i" 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//`;
		hour=`echo $fulltime | cut -d ':' -f 1`;
		minute=`echo $fulltime | cut -d ':' -f 2`;
		second=`echo $fulltime | cut -d ':' -f 3 | cut -d '.' -f 1`;

		seconds=`expr 3600 \* $hour + 60 \* $minute + $second`;
		ss=`expr $seconds / 2`; # from the middle of video
		#echo "$vid: $ss / $seconds";


		# create thumbnail from middle of video
		output=`ffmpeg  -ss $ss -i "$i" -f image2 -vframes 1 -s $preview "$tnDir/$vid.jpg" 2>&1`;
		output=`ffmpeg  -ss $ss -i "$i" -f image2 -vframes 1 -s $standard "$tnDir/$vid-v.jpg" 2>&1`;

		if [ "$size" == "$hd " ] && [ ! -f "$tnDir/$vid-hd.jpg" ]; then
			output=`ffmpeg  -ss $ss -i "$i" -f image2 -vframes 1 -s $hd "$tnDir/$vid-hd.jpg" 2>&1`;
		fi


		if [ -f "$tnDir/$vid.jpg" ] && [ -f "$tnDir/$vid-v.jpg" ] && [ -f "$tnDir/$vid-hd.jpg" ] && [ "$size" == "$hd " ]; then
			echo "$(tput setaf 2)Thumbnails preview, standard and HD for [$vid] saved$(tput sgr0)";

		elif [ -f "$tnDir/$vid.jpg" ] && [ -f "$tnDir/$vid-v.jpg" ]; then
			echo "$(tput setaf 2)Thumbnails preview and standard for [$vid] saved$(tput sgr0)";

		else
			echo "$(tput setaf 1)Error: Thumbnails for [$vid] were not saved$(tput sgr0)";
		fi
	else
		echo "$(tput setaf 6)Notice: Thumbnails preview and standard for [$vid] already exists.$(tput sgr0)";
	fi
done

Getting error as below
Notice: Thumbnail /var/www/data/videos/.tn/232.jpg already exists.

Could you suggest me what is wrong?