Re: [Tracker] Ontology addition for media files

[Lionel Landwerlin <lionel g landwerlin linux intel com>]

On Wed, 2011-03-23 at 17:16 +0200, Ivan Frade wrote:
> Hi,
>
> On Wed, Mar 23, 2011 at 3:35 PM, Lionel Landwerlin
> <lionel g landwerlin linux intel com> wrote:
> > Hi all,
> >
> > I have this use case where a multimedia application would like to
> > restart an already played stream at the last played position.
> > I'm also interested in having the play count and the last played
> > date/time.
> > At the moment there is no such property to store that kind of
> > information on media files.
>
>  I think it makes sense to share that information between apps. Maybe
> a 3rd party wants to add a player and respect those values.
>
> > To test my use case in the application I quickly added the following
> > properties in the tracker ontology (but I know it's not the right
> > place) :
> >
> > tracker:lastPlayPosition a rdf:Property ;
> >        nrl:maxCardinality 1 ;
> >        rdfs:domain nfo:Media ;
> >        rdfs:range xsd:integer .
>
> I think it is ok in Media (even when it doesn't make sense for
> Images). What is the unit of that integer? seconds? milliseconds?

I also nfo:duration is a property of nfo:Media (which has a nfo:Visual
subclass), that isn't very relevant to images...

I would like that unit to be in seconds.

> > tracker:lastPlayDate a rdf:Property ;
> >        nrl:maxCardinality 1 ;
> >        rdfs:domain nfo:Media ;
> >        rdfs:range xsd:dateTime .
>
>  You should use nie:contentAccessed. The atime of the file should be
> under nfo:fileLastAccesed.

Ok sure, I missed that one.

> > tracker:playCount a rdf:Property ;
> >        nrl:maxCardinality 1 ;
> >        rdfs:domain nfo:Media ;
> >        rdfs:range xsd:integer .
>  This is nie:usageCounter.

Great, thanks.

>  Regards,
>
> Ivan