use warnings;
use strict;
use XML::LibXML;

my $mkvext = 'mkvextract'; 
my ($self)    = {};
$self->{xml}  = XML::LibXML->new();

my $item = "F:\\My Folder\\split-001.mkv";
my $cmd = "$mkvext chapters $item";
open my $H, "$cmd |";
binmode $H;
my $xml = $self->{xml}->load_xml(IO => $H);