how to view all brands in magento containing products?

 
setEntityTypeFilter(Mage::getModel('catalog/product')->getResource()->getTypeId())->addFieldToFilter('attribute_code', 'manufacturer');

$objSpecAttribute = $objManufacturers->getFirstItem()->setEntity(Mage::getModel('catalog/product')->getResource());

$arrAllManufactuers = $objSpecAttribute->getSource()->getAllOptions(false);  

$i=0;
foreach($arrAllManufactuers as $objBrands)
{ 

$objProduct = mage::getModel('catalog/product')->getCollection()->addAttributeToFilter('manufacturer',$objBrands["value"])->addAttributeToFilter('status','1')->addAttributeToFilter('visibility','4'); 
if($objProduct->count()) 
{
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}
}?>