Re: [Tracker] Write-back data & default/dummy data

[Martyn Russell <martyn lanedo com>]

On 26/10/09 18:44, Maria K. wrote:
> Martyn Russell wrote:
> > Hi,
> >
> > After this mornings meeting, we briefly discussed libstreamanalyser
> > (LSA) and again, this topic of writing data back to files and setting
> > default data where it doesn't exist in the file's metadata was brought
> > up.
> >
> >
> > 1. If a file doesn't have ALL the metadata associated with it that we
> > would normally expect (for example Video Title), should we set a
> > default value for these cases?
> maybe sth. like 'Unknown', better maybe to leave it empty

"Unknown" can be used as a valid value in some situations.

The idea that Jurg came up with was to have a COALESCE() SPARQL 
function, so you could have:

   SELECT COALESCE(nie:title(?n),nfo:fileName(?n),"unknown")

This way it falls back to those values in that order. I quite like this 
approach, but I wonder if it is enough.

> > 2. If we do have a default value to set, should we write this back to
> > the file?
>
> I wouldn't write it back without asking the user first.

We wouldn't.

> This is not the
> kind of behaviour I'd expect from tracker. (would you like to have all
> of your videos renamed to unknown-whatever_was_here_before.mov?)

I don't think this will happen anyway. Most of the team are not in 
favour of doing this from recent discussion on IRC.

> If there's a dialog giving files with missing tags that could be fixed,
> that's different.

It won't really be like that.

--
Regards,
Martyn