Sorry for not getting back sooner. I was out of the office and was doing everything from memory. Here is the code I'm using and for a 1 gig file this takes a few hours. I forgot that I have to change every 2 bits to a corresponding 2 bit sequence. I'm also only looking for the first sync pattern once. I was hoping to do this without unpacking and later packing the data. That's the biggest drawback. 
die "USAGE: $0 input\n" if scalar(@ARGV) < 1;

$| = 1;
$/ = \960;

open IN, "$ARGV[0]" or die "$ARGV[0] : $!";
open OUT, ">tmp2";

my $y = 0;
my $value = '';

while (<IN>) {
     my $bits = unpack("b*", $_);
     @array = split(//, $bits);
     foreach $value (@array) {
          $y++;
          $tmp = $tmp . $value;
          if ($y == 2) {
               if ($tmp =~ /00/) {
                    $tmp = '11';
               } elsif ($tmp =~ /11/) {
                    $tmp = '00';
               }
               print OUT $tmp;
               $y = 0;
               $tmp = '';
          }
     }
}

close IN;
close OUT;

$/ = \7680;
my $x = 0;

#I LEFT THE OUTPUT AS ASCII-IZED BINARY AT THIS POINT
#THUS THE LARGE INCREASE IN FILE SIZE

open IN, "$tmp2";
open OUT, >$tmp3";

while (<IN>) {
     $_ =~ s/^.*(11111011000010001111011100010000)/$1/ if $x == 0;
     $x = 1;
     print OUT pack("b*", $_);
}

close IN;
close OUT;

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10-02-2005 Janitored by Arunbear - added code tags, as per Monastery guidelines

In reply to Re^6: pack/unpack binary editing by tperdue
in thread pack/unpack binary editing by tperdue

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