translate files to m4a by ffmpeg. using perl under Windows bat file.

gistfile1.pl

@rem = '--*-Perl-*--
@echo off
if "%OS%" == "Windows_NT" goto WinNT
perl -x -S "%0" %1 %2 %3 %4 %5 %6 %7 %8 %9
goto endofperl
:WinNT
perl -x -S %0 %*
if NOT "%COMSPEC%" == "%SystemRoot%\system32\cmd.exe" goto endofperl
if %errorlevel% == 9009 echo You do not have Perl in your PATH.
if errorlevel 1 goto script_failed_so_exit_with_non_zero_val 2>nul
goto endofperl
@rem ';
#!perl
#line 15

use strict;
use warnings;
use feature qw/say/;
use Encode qw/decode encode/;
use File::Basename qw/fileparse/;
use File::Path;

exit_with_help() unless scalar @ARGV;

my @files;
my @cmd = qw/ffmpeg -vn -acodec copy -i/;
foreach my $file (@ARGV) {
  next unless -e -s -f $file;
	$file = decode("CP932", $file);
	my ($name, $dir, $ext) = fileparse($file, qr/\.[a-zA-Z0-9]+$/);
	system (@cmd, encode("CP932", $file),
		encode("CP932", File::Spec->catfile($dir, $name . ".m4a"))
	);
}

sub exit_with_help {
	my $mes = shift // "perl $0 file [file ...]";
	say $mes;
	exit;
}


__END__
:endofperl