[Nepomuk] Plasma Media Center - semantic desktop advices

[Vishesh Handa]

Hey Alesssandro

Creating such a backend shouldn't be too difficult. The database doesn't
need to be created, you could just use Nepomuk's database. Currently,
Nepomuk uses Soprano for storing RDF data, which in turn uses Virtuoso.
There are 2 things you will need to do -
1. Make sure all the data which you want accessible via PMC is indexed. You
can use Nepomuk's KCM to do that, or you can directly edit the
nepomukstrigirc file.
2. Construct Sparql queries to segregate data based on its type. (Music,
Video, Pictures, etc)

The Nepomuk File Ontology is exactly what you're looking for. It has classes
like nfo:Audo, nfo:Image, nfo:Video, or if you want to go for a more generic
option - nfo:Media. Example -
"select ?url where { ?r nie:url ?url. ?r a nfo:Audio. } LIMIT 10"
This should give you 10 Audio Files.

I think Nepomuk is perfect for what you want to do, cause it already
segregates the data, and you won't need your own database. Additionally, you
could even search by Artist, Actor, Director, and other properties. Plus, if
those properties aren't present in the File, the Web Metadata extractor
should get those values ( GSoC project 2010 )

Another thing that could be done is that you could display information about
different Artists, Actors, Movie Directors, Imdb ratings, etc and you will
have to do next to nothing to get that info. Nepomuk should handle all the
messy work. You just need to perform the queries. ( Wait for KDE 4.6 for
this to get implemented )

*Far fetched Idea :* If I manage to implement Metadata sharing properly, you
could theoretically search through other machine's Nepomuk database. So, I
guess that would add a social feature to the PMC.

- Vishesh Handa

On Sat, Jun 5, 2010 at 3:32 PM, Alessandro Diaferia
<alediaferia at gmail.com>wrote:

> Hello list,
> you probably have heard about Plasma Media Center (PMC).
>
> I would need some advice from regarding media type files handling.
> Little briefing: PMC allows different browsing backends to be inserted in
> order
> to allow different kind of file browsing, This leads to giving the chance
> to the user to both
> browse among his local files or among e.g. videos from youtube, pictures
> from picasa and so on...
>
> Regarding the local file browsing we need to do something like:
> the user selects the folder PMC should search for media files, a database
> is created with such files
> and later the application will always show such files categorized and what
> not. In addition to this
> we'd like to separate pictures, videos and audio files. Later one backend
> for each type (music, picture and video)
> will make use of such databases in order to allow the user browse through
> them.
>
> Now your help: what's the best way for doing this from the Nepomuk point of
> view?
> I hope my explanation was clear enough. Of course just ask for any
> clarification.
>
> Thanks in advance for your help.
> Regards
> --
> Alessandro Diaferia
> KDE Developer
> KDE e.V. member
>
>
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>
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