#!/bin/bash
#
# thumber script by luis peralta - http://www.ziritione.org
# inspired by http://www.threewordtitle.com/thumber/
#
# needs: mplayer, imagemagick

if [ $# -lt 2 ]
then
  echo "usage: $0 video-file output-thumber-image"
  exit 1
fi  


TILE_SIZE=32
TMPDIR="/tmp/thumbr-$$"

mplayer -really-quiet -ao null -vo jpeg:quality=100:outdir=$TMPDIR -sstep 1 "$1"
N_FRAMES=`echo "sqrt($(ls -l $TMPDIR|wc -l))" |bc`
montage $TMPDIR/*jpg -mode Concatenate  -resize ${TILE_SIZE}x -tile ${N_FRAMES}x "$2"
rm -rf $TMPDIR