Search track titles using DLNA

Hi,

I have over 50000 music tracks and would be happy if I could search trough the titles with a dlna client like android app mediahouse.
When I type in some word in the search box I only get some folders (not containing my search query) and not the songs as expected.

Serviios log prints something like:
{SearchCriteria=dc:title contains "sandman" and upnp:class derivedfrom "object.item.videoItem", StartingIndex=0, Filter=*, ContainerID=0, RequestedCount=25, SortCriteria=+dc:title}

Thanks