#!/usr/bin/perl -w
#######################################################################
# 
# MPlayercrop - MPlayer autocrop script
# By Martin (bumby) Stenberg <bumby@evilninja.org>
#
use strict;
use File::Basename;

my $SAME_FRAMES=30;     # You may have to tweak this

usage($0) unless @ARGV;

my $argv="";
foreach my $arg (@ARGV){
        $arg=~s/ /\\ /g;
        $argv.=" $arg";
}

my $s="";
my $old="";
my $i=0;
my $pid = fork();
die "Couldn't fork: $!\n" unless defined $pid;

if($pid == 0){
        open(FILE,"mplayer -vf cropdetect $argv|")
                or die "Could not start mplayer";

        print "\nGathering crop detections. Please wait...\n";
        while(<FILE>){
                $s=$_;
                if(/\(-vf crop=(\d+:\d+:\d+:\d+)\)/){
                        $s=$1;
                        if("$s" eq "$old"){
                                $i++;
                        }else{
                                $i=0;
                        }
                }
                if($i == $SAME_FRAMES){
                        system("reset");
                        exec("mplayer -vf crop=$s $argv");
                        exit 0;
                }

                $old=$s;
        }
        exit 0;
}

sub usage{
        my $file = basename(shift);
        print "Usage: $file [mplayer options] file\n";
        exit 1;
}