Re: [Tracker] JPEG EXIF Metadata

[Ivan Frade <ivan frade nokia com>]

Hi!

El vie, 09-01-2009 a las 09:07 -0500, ext Damien Moore escribiÃ:
> On Fri, Jan 9, 2009 at 5:09 AM, Ivan Frade <ivan frade gmail com> 
>          
>                 
>                 2. When I use tracker-extract to look at the metadata
>                 I see the following paltry list of key,item pairs
>                 (notably no date information!!)
>         
>         The tracker-extractor in trunk extracts more information. Our
>         intention is not to extract _every_ possible information from
>         the images, but that useful for a regular desktop user. 
>
> does the latest version include the creation and modification dates of
> images in the metadata (or somewhere else). where in the source do I
> look to see what is supported?

 Yes, it is there. You can take a look into:

src/tracker-extract/tracker-extract-jpeg.c
src/tracker-extract/tracker-extract-png.c
src/tracker-extract/tracker-extract-xmp.c

 And in general in the extractors there.
>  
>         After next release you can try again the extractor and open a
>         bug if you feel that some important information is missing.
>
> Actually, I'm happy to play around with trunk. I downloaded the source
> from trunk last night when I was playing around with the dbus
> interface. Now is trunk sufficiently stable that I could run the
> daemon in my main development session or should i virtualize the whole
> thing (I really don't want to do this - I'm well aware of the risks of
> running alpha software)
 It should be stable and ready to use. We are near to a release, so
feedback is welcome.

> I'm prototyping a really lightweight image browser that uses tracker
> to supply the list of images and filter its views. It seems tracker
> should be up to the task. One thing I wonder about is whether tracker
> has a "live query". e.g. I search for a set of images and receive a
> list of hits, then I import a new image from my camera that meets the
> criteria of the search, could tracker be set up to notify my app about
> the new matching hits?

 That idea is flying around since some time, but it is not going to
happen soon (if it happens at all). 

 In the next release "libtracker" will have the API it has now, but we
plan to break that API and offer something more clean and convenient in
next releases. Feedback from application developers is welcome.
 
> other Qs:
> * has anyone got tracker to run successfully on windows?

 No (AFAIK), but the dependencies are windows-compatible (at least the
core depends only in glib). If you have time and energy to try it on
windows, we can help fixing the issues you could find.

> * is it possible to setup a daemon on a shared space that can take
> queries from multiple users? (e.g. a shared image collection)

 No, tracker works as a user process. Probably all users have access to
that shared image collection directory, so add that folder in your
WatchDirectories variable.

 Queries from multiple users sounds very messy due to security reasons.


> Don't thank me too soon, I'm going to have *many* more questions... :)

 Always welcome,

Ivan