Mediaserver for Ubuntu 12.04

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http://askubuntu.com – as the title says I´m searching for a mediaserver for Ubuntu 12.04. I have already tried Mediatomb, Serviio, Miro (media management), Songbird (media management). But the thing is, that I need a mediaserver which is able to share the media via DLNA and which is performant, so optional with an external database server. The problem is, that I have a very big media collection, and media management tools like Songbird and Miro are not performant with such a lot content. Do you know some good server solutions for media management and sharing? greetings Nicolas (HowTos)