my $input_file = '/path/to/filename.mp4';
my $output_files = '/path/to/filename_%d.png';
my $start_time = 4;
my $num_frames = 10;

my @args = (
	'/path/to/ffmpeg',
	'-loglevel', 'quiet',
	'-ss', $start_time,
	'-i', $input_file,
	'-frames:v', $num_frames,
	$output_files
);

my $response = system( @args );
if ($response == 0) {
	print "system command success";
}
else {
	print "system command failed";
}