storyboard.php

<?php

$videoID = @trim($argv[1]);

if (strlen($videoID) <= 0) {
	die("USAGE: storyboard <videoid>\n");
}

$html = file_get_contents("https://www.youtube.com/watch?v=$videoID");

$pattern = '#"storyboard_spec":"([^"]+)"#';

if (!preg_match_all($pattern, $html, $matches)) {
	die("ERROR: Cannot find storyboard_spec\n");
}

$parts = explode('#', $matches[1][0]);
$url = $parts[0];
$token = $parts[count($parts) - 1];

$url = explode('|', $url);
$url = $url[0];

$url = str_replace(
	array('$L', '$N'),
	array(2, 'M2'),
	$url
);

$url = json_decode("\"$url\"");

echo "$url?sigh=$token\n";