Symfony2 - Assetic - load images in CSS

use the cssrewrite filter from Assetic bundle

In config.yml:

assetic:    debug:          %kernel.debug%    use_controller: false    filters:        cssrewrite: ~

And then call your stylesheets like this:

 {% stylesheets 'bundles/cmtcore/css/*' filter='cssrewrite' %}        <link rel="stylesheet" type="text/css" media="screen" href="{{ asset_url }}" /> {% endstylesheets %}

Oh and don't forget to use php app/console assetic:dump

There was few issues with ccsrewrite:

the CssRewrite filter does not work when using the @MyBundle syntax in AsseticBundle to reference the assets. This is a known limitation.

Here is php version for cssrewrite:

<?php     foreach ($view['assetic']->stylesheets(array(        'bundles/test/css/foundation/foundation.css',        'bundles/test/css/foundation/app.css',        'bundles/test/css/themes/adapzonManager.css'), array('cssrewrite')) as $url):?>    <link rel="stylesheet" href="<?php echo $view->escape($url) ?>" /><?php endforeach; ?>

I solved the problem by following the instructions on this site:http://www.craftitonline.com/2011/06/symfony2-beautify-with-assetic-and-a-template-part-ii/

The actual problem is that you reference your bundle resources absolute, but must reference them relative.

{% stylesheets filter='cssrewrite' output='css/*.css'    'bundles/blistercarerisikobewertung/css/*'  %}    <link href="{{ asset_url }}" type="text/css" rel="stylesheet" />{% endstylesheets %}

Clear your cache and install your assets again