Here is the command to get the length of a video file

mplayer -frames 0 -identify myvideo > /dev/stdout | grep -i ID_LENGTH

You can use this function to get the time in hh:mm:ss format

	function getLength($file) {
		// Get Time
		$cmd = MPLAYER." -frames 0 -identify ".$file." > /dev/stdout | grep -i ID_LENGTH ";
	    $duration = exec($cmd);
		$duration = str_replace("ID_LENGTH=", "", $duration);
		$duration = explode(".", $duration);
		$duration = array_shift($duration);
		$durationToTime = $this->Sec2Time($duration);
		$length = str_pad((int) $durationToTime["hours"],2,"0",STR_PAD_LEFT).":".str_pad((int) $durationToTime["minutes"],2,"0",STR_PAD_LEFT).":".str_pad((int) $durationToTime["seconds"],2,"0",STR_PAD_LEFT);
		return $length;
	}

Here is the command to get the length of a video file

ffmpeg -i myfile 2>/dev/stdout | grep -i duration

You can use this function to get the time in hh:mm:ss format

	function getLength($file) {
		if (is_file($file)) {
			// Get Length
		    $cmd = "ffmpeg -i $file 2>/dev/stdout | grep -i duration";
		    $duration = system($cmd);

		    $duration = explode(",", trim($duration));
		    $tabTime = explode(":", $duration[0]);
		    $mediaLength = $tabTime[1].':'.$tabTime[2].':'.substr($tabTime[3], 0, 2);

		    $mediaLength = str_replace(" ", "", $mediaLength);
			return $mediaLength;
		}
	}

A function used to format a string into url string

function urlFormat($str) {
	$str = mb_strtolower($str, 'UTF-8');
	$str = str_replace(
	       array(
	            'à', 'â', 'ä', 'á', 'ã', 'å',
	            'î', 'ï', 'ì', 'í',
	            'ô', 'ö', 'ò', 'ó', 'õ', 'ø',
	            'ù', 'û', 'ü', 'ú',
	            'é', 'è', 'ê', 'ë',
	            'ç', 'ÿ', 'ñ',
	            'À', 'Â', 'Ä', 'Á', 'Ã', 'Å',
	            'Î', 'Ï', 'Ì', 'Í',
	            'Ô', 'ö', 'Ò', 'Ó', 'Õ', 'Ø',
	            'Ù', 'Û', 'Ü', 'Ú',
	            'É', 'È', 'Ê', 'Ë',
	            'Ç', 'Ý', 'Ñ',
	       ),
	       array(
	            'a', 'a', 'a', 'a', 'a', 'a',
	            'i', 'i', 'i', 'i',
	            'o', 'o', 'o', 'o', 'o', 'o',
	            'u', 'u', 'u', 'u',
	            'e', 'e', 'e', 'e',
	            'c', 'y', 'n',
	            'A', 'A', 'A', 'A', 'A', 'A',
	            'I', 'I', 'I', 'I',
	            'O', 'O', 'O', 'O', 'O', 'O',
	            'U', 'U', 'U', 'U',
	            'E', 'E', 'E', 'E',
	            'C', 'Y', 'N',
	        ),
	        $str
	);

	str = ereg_replace("[^[:alnum:]]+", '-', $str);
	$str = ereg_replace("[-]+", '-', $str);
	$str = ereg_replace("[-]$", '', $str);

	return $str:
}