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#!/bin/bash
#
# Date: 2010-01-15
# Author: Ole Kristian Lien
# License: GNU General Public License
#
# Extract thumbnail from video
EXT=`echo "$1"|awk -F . '{print $NF}'`
BASENAME=`basename $1 .$EXT`
DURATION=`./duration $1`
RESOLUTION=`./video_resolution $1`
THUMB="320x240"
OLD_IFS="$IFS"
IFS=":"
TIME=( $DURATION )
IFS="$OLD_IFS"
TOTAL=`echo "(${TIME[0]} * 3600) + (${TIME[1]} * 60) + ${TIME[2]}" | bc`
let SECOND=$RANDOM%$TOTAL+1
if [ -z "$1" ]; then
echo "Usage: $0 <video-file>"
exit 1
fi
./require ffmpeg || { exit 1; }
./require convert || { exit 1; } #imagemagick
echo -n " * Extracting image ($RESOLUTION) from video (frame $SECOND s)..."
ffmpeg -itsoffset -$SECOND -i $1 -vcodec mjpeg -vframes 1 -an -f rawvideo -s $RESOLUTION $BASENAME.jpeg \
> "$BASENAME.jpeg-compresslog" 2>&1
echo -e "OK!"
echo -n " * Resizing image to thumbnail ($THUMB)..."
convert -resize $THUMB $BASENAME.jpeg $BASENAME-thumb.jpeg
echo -e "OK!"
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