[gstreamer-bugs] [Bug 486659] metadata parser for image files

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: HEAD CVS




------- Comment #15 from Edgard Lima  2007-10-31 21:41 UTC -------
today I have committed the following changes to the element:

it sends the whole IPTC (Exif or else XMP) chunk in just one tag,
#define GST_TAG_IPTC "iptc"

this way, pipeline like this works fine:

filesrc ! metadataparse ! jpegdec ! image-processing ! jpegenc ! metadatamux !
filesink

'cause the metadatamux element will receive the tag event and write to the
image file.

....now it would be good to create some default tags (bug #482947) related to
images. And those tags could be mapped to/from exif,iptc and xmp metadata.

for example:

v4l2src ! jpegenc ! metadatamux ! filesink

the v4l2src element wants to send just "EXPOSURE_TIME" tag (no matter if it is
iptc, exif or whatelse)...then the metadatamux-exif could just map this image
general tag into one of its.

...if we don't have such new default tags to be mapped...the only thing we can
do is : the application receives the tag message i.e. "EXPOSURE_TIME" and then
send it back to the pipeline like this "Exif::ExposureTime" (or something like
this using nested structures or whatelse)..so, in this second case, the map is
up to the application

comments pls !!

BR
Edgard


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