getid3_lib::PlaytimeString( int $seconds ): string

631	public static function PlaytimeString($seconds) {632		$sign = (($seconds < 0) ? '-' : '');633		$seconds = round(abs($seconds));634		$H = (int) floor( $seconds                            / 3600);635		$M = (int) floor(($seconds - (3600 * $H)            ) /   60);636		$S = (int) round( $seconds - (3600 * $H) - (60 * $M)        );637		return $sign.($H ? $H.':' : '').($H ? str_pad($M, 2, '0', STR_PAD_LEFT) : intval($M)).':'.str_pad($S, 2, 0, STR_PAD_LEFT);638	}