GStreamer-devel

image metadata on GStreamer

Classic

List

Threaded

8 messages Options

Edgard Lima

image metadata on GStreamer

Hello guys,

I have written a plugin to read and write metadata (EXIF, IPTC and XMP)
to image files (JPEG and PNG)

The plugin is at:

http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/

Before you compile it if have to install some of the following lib
(apt-get install should work):

http://libiptcdata.sourceforge.net/
http://libexif.sourceforge.net/
http://libopenraw.freedesktop.org/wiki/Exempi

then you can test it with:

http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/tests/icles/
(metadata_editor.c and metadata_editor.glade)

You can insert new tags (only the ones that has already been registered)
to see the list of tags, look at:
http://webcvs.freedesktop.org/gstreamer/gstreamer/gst/gsttaglist.h?view=markup
(I will create a html file soon with a list of all mapped tags)

and "grep GST_TAG" into

http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/

PLEASE try it a lot, and Open bugs, or Report me, or ask me questions.

btw: the plugin has been written to be extended so other chunk based
file formats can be easily handled too.

Best Regards,
Edgard Lima
[hidden email]

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Dr. Michael J. Chudobiak

Re: image metadata on GStreamer

Edgard Lima wrote:

Edgard,

Could I strongly suggest that you use exiv2 instead? libexif is poorly
maintained and crash prone, in my experience. exiv2 supports xmp, iptc,
exif, and raw files, all in one library. For an example of how we are
using it in the trunk version of gthumb, see
http://svn.gnome.org/viewvc/gthumb/trunk/libgthumb/gth-exiv2-utils.cpp?view=markup.
We are using it very successfully, even though the exiv2 api is C++, and
gthumb is C. The exiv2 maintainer is very responsive.

Tag reading is quite simple with exiv2, as the above file shows.

- Mike

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Edgard Lima

Re: image metadata on GStreamer

Hi Michael,

First of all: Thanks for your feedback/help.

I have considered to use exiv2 before start developing. The problem is
the license, GPL. I have asked the author if he could change it to LGPL
and he said: "no plans to change".

I haven't got 'craches' with libexif until now. Could you please send me
files, or tell me how can I get such craches?

Thanks you again,
Edgard Lima

ext Dr. Michael J. Chudobiak wrote:

> Edgard Lima wrote:
>> Hello guys,
>>
>> I have written a plugin to read and write metadata (EXIF, IPTC and XMP)
>> to image files (JPEG and PNG)
>>
>> The plugin is at:
>>
>> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/
>>
>> Before you compile it if have to install some of the following lib
>> (apt-get install should work):
>>
>> http://libiptcdata.sourceforge.net/
>> http://libexif.sourceforge.net/
>> http://libopenraw.freedesktop.org/wiki/Exempi
>
> Edgard,
>
> Could I strongly suggest that you use exiv2 instead? libexif is poorly
> maintained and crash prone, in my experience. exiv2 supports xmp, iptc,
> exif, and raw files, all in one library. For an example of how we are
> using it in the trunk version of gthumb, see
> http://svn.gnome.org/viewvc/gthumb/trunk/libgthumb/gth-exiv2-utils.cpp?view=markup.
> We are using it very successfully, even though the exiv2 api is C++, and
> gthumb is C. The exiv2 maintainer is very responsive.
>
> Tag reading is quite simple with exiv2, as the above file shows.
>
> - Mike

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Dr. Michael J. Chudobiak

Re: image metadata on GStreamer

Edgard Lima wrote:

> Hi Michael,
>
> First of all: Thanks for your feedback/help.
>
> I have considered to use exiv2 before start developing. The problem is
> the license, GPL. I have asked the author if he could change it to LGPL
> and he said: "no plans to change".
>
> I haven't got 'craches' with libexif until now. Could you please send me
> files, or tell me how can I get such craches?

I don't have any sample files. You can search the gthumb bug reports,
though:

http://bugzilla.gnome.org/buglist.cgi?product=gthumb&long_desc_type=substring&long_desc=libexif&bug_status=RESOLVED&resolution=NOTGNOME

That list doesn't include the duplicate bug reports (there are quite a
few)...

- Mike

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Edgard Lima

Re: image metadata on GStreamer

In reply to this post by Edgard Lima

Now there is a list of tags mapped

http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/metadata_mapping.htm?revision=1.1

BR,
Edgard

ext Edgard Lima wrote:

> Hello guys,
>
> I have written a plugin to read and write metadata (EXIF, IPTC and XMP)
> to image files (JPEG and PNG)
>
> The plugin is at:
>
> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/
>
> Before you compile it if have to install some of the following lib
> (apt-get install should work):
>
> http://libiptcdata.sourceforge.net/
> http://libexif.sourceforge.net/
> http://libopenraw.freedesktop.org/wiki/Exempi
>
> then you can test it with:
>
> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/tests/icles/
> (metadata_editor.c and metadata_editor.glade)
>
> You can insert new tags (only the ones that has already been registered)
> to see the list of tags, look at:
> http://webcvs.freedesktop.org/gstreamer/gstreamer/gst/gsttaglist.h?view=markup
> (I will create a html file soon with a list of all mapped tags)
>
> and "grep GST_TAG" into
>
> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/
>
> PLEASE try it a lot, and Open bugs, or Report me, or ask me questions.
>
> btw: the plugin has been written to be extended so other chunk based
> file formats can be easily handled too.
>
> Best Regards,
> Edgard Lima
> [hidden email]
>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Dr. Michael J. Chudobiak

Re: image metadata on GStreamer

Edgard Lima wrote:
> Now there is a list of tags mapped
>
> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/metadata_mapping.htm?revision=1.1

No DateTime tags are mapped? (See
http://bugzilla.gnome.org/show_bug.cgi?id=503582).

- Mike

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Edgard Lima

Re: image metadata on GStreamer

Hi Mike,

it is not mapped at the moment. But, yes, I have plans to map it soon.
Actually, right now I'm add more mappings.

Hopefully on Monday we will also have (for exif only, for the time being):

orientation
compression
iso_speed_ratings
date_time_modified
date_time_original
date_time_digitezed
light_source
flash
focal_lenght
scene_capture

btw: all of them, for the time being not add to gsttaglists.h (some of
them, like 'time' could be added, 'cause we are identifying a common
need for it... Tim???? )

and soon I will also map more XMP tags

look:

http://bugzilla.gnome.org/show_bug.cgi?id=482947
and also
http://bugzilla.gnome.org/show_bug.cgi?id=481169

BR,
Edgard Lima (Edgard_ - alima)

ext Dr. Michael J. Chudobiak wrote:

> Edgard Lima wrote:
>> Now there is a list of tags mapped
>>
>> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/metadata_mapping.htm?revision=1.1
>>
>
> No DateTime tags are mapped? (See
> http://bugzilla.gnome.org/show_bug.cgi?id=503582).
>
> - Mike

Sebastian Dröge

Re: image metadata on GStreamer

In reply to this post by Edgard Lima

Am Donnerstag, den 31.01.2008, 00:42 +0200 schrieb Edgard Lima:

Hi,
the plugin itself works good for me but I really dislike the name.
metadata is too generic IMHO, it should be more something like
imagemetadata or something like that.

IMHO this should be renamed before it can be moved to plugins-good.

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

signature.asc (196 bytes) Download Attachment