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+#!/usr/bin/env perl
+
+# Copyright (c) 2014 Nicolas George
+#
+# This file is part of FFmpeg.
+#
+# FFmpeg is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public License
+# as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# FFmpeg is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+=head1 NAME
+
+dvd2concat - create a concat script for a DVD title
+
+=head1 SYNOPSIS
+
+tools/dvd2concat I<path/to/dvd/structure> > I<file.concat>
+
+=head1 DESCRIPTION
+
+This script uses B<lsdvd> to produce concat script for a DVD title.
+The resulting script can be used to play the DVD using B<ffplay>, to
+transcode it using B<ffmpeg> or any other similar use.
+
+I<path/to/dvd/structure> is the path to the DVD structure hierarchy; it
+normally contains a directory named B<VIDEO_TS>. It must not be encrypted
+with CSS.
+
+I<file.concat> is the output file. It can be used a input to ffmpeg.
+It will require the B<-safe 0> option.
+
+=cut
+
+use strict;
+use warnings;
+use Getopt::Long ":config" => "require_order";
+use Pod::Usage;
+
+my $title;
+
+GetOptions (
+  "help|usage|?|h" => sub { pod2usage({ -verbose => 1, -exitval => 0 }) },
+  "manpage|m"      => sub { pod2usage({ -verbose => 2, -exitval => 0 }) },
+  "title|t=i"      => \$title,
+) and @ARGV == 1 or pod2usage({ -verbose => 1, -exitval => 1 });
+my ($path) = @ARGV;
+
+my $lsdvd_message =
+"Make sure your lsdvd version has the two following patches applied:\n" .
+"http://sourceforge.net/p/lsdvd/feature-requests/1/\n" .
+"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=603826\n";
+
+my $lsdvd = do {
+  open my $l, "-|", "lsdvd", "-Op", "-x", $path
+    or die "You need to install lsdvd for this script to work.\n$lsdvd_message";
+  local $/;
+  <$l>;
+};
+my %lsdvd = eval $lsdvd;
+die $@ if $@;
+
+if (!defined $title) {
+  $title = $lsdvd{longest_track};
+  warn "Using longest title $title\n";
+}
+my $track = $lsdvd{track}[$title - 1]
+  or die "Title $title does not exist (1-", scalar(@{$lsdvd{track}}), ")\n";
+my $vts_base = sprintf "%s/VIDEO_TS/VTS_%02d_", $path, $track->{vts};
+my @frag;
+for my $i (1 .. 9) {
+  my $file = sprintf "%s%d.VOB", $vts_base, $i;
+  my $size = -s $file or last;
+  push @frag, { file => $file, size => $size >> 11 };
+}
+
+my $concat = "ffconcat version 1.0\n";
+$concat .= "\nstream\nexact_stream_id 0x1E0\n";
+for my $audio (@{$track->{audio}}) {
+  $concat .= "\nstream\nexact_stream_id " . $audio->{streamid} . "\n";
+}
+for my $subp (@{$track->{subp}}) {
+  $concat .= "\nstream\nexact_stream_id " . $subp->{streamid} . "\n";
+}
+for my $cell (@{$track->{cell}}) {
+  my $off = $cell->{first_sector};
+  die "Your lsdvd version does not print cell sectors.\n$lsdvd_message"
+    unless defined $off;
+  my $size = $cell->{last_sector} + 1 - $cell->{first_sector};
+
+  my $frag = 0;
+  while ($frag < @frag) {
+    last if $off < $frag[$frag]->{size};
+    $off -= $frag[$frag++]->{size};
+  }
+  die "Cell beyond VOB data\n" unless $frag < @frag;
+  my $cur_off = $off;
+  my $cur_size = $size;
+  my @files;
+  while ($cur_size > $frag[$frag]->{size} - $cur_off) {
+    push @files, $frag[$frag]->{file};
+    $cur_size -= $frag[$frag]->{size} - $cur_off;
+    $cur_off = 0;
+    die "Cell end beyond VOB data\n" unless ++$frag < @frag;
+  }
+  push @files, $frag[$frag]->{file};
+  my $file = @files == 1 ? $files[0] : "concat:" . join("|", @files);
+  my $start = $off << 11;
+  my $end = ($off + $size) << 11;
+  $file = "subfile,,start,${start},end,${end},,:$file";
+
+  my $dur = int(1000 * $cell->{length});
+  $concat .= sprintf "\nfile '%s'\nduration %02d:%02d:%02d.%03d\n", $file,
+    int($dur / 3600000), int($dur / 60000) % 60, int($dur / 1000) % 60,
+    $dur % 1000;
+}
+
+print $concat;