Filter-media thumbnails of JPEG 2000 bitstreams

[Pedro Amorim]

Hello everyone,

I have been trying to generate thumbnails from JPEG 2000 files in DSpace but have been unsuccessfull thus far.

1) I have installed jai and jai_image from http://data.opengeo.org/suite/jai/

2) Thumbnails from PDF and TIFF are working just fine

3) I have added JPEG 2000 bitstream format in DSpace as name 'JPEG 2000', mimetype 'image/jp2', known format and extension 'jp2'

4) This is my dspace.cfg file:

plugin.named.org.dspace.app.mediafilter.FormatFilter = \

  org.dspace.app.mediafilter.PDFFilter = PDF Text Extractor, \

  org.dspace.app.mediafilter.HTMLFilter = HTML Text Extractor, \

  org.dspace.app.mediafilter.WordFilter = Word Text Extractor, \

  org.dspace.app.mediafilter.PowerPointFilter = PowerPoint Text Extractor, \

  org.dspace.app.mediafilter.JPEGFilter = JPEG Thumbnail, \

  org.dspace.app.mediafilter.BrandedPreviewJPEGFilter = Branded Preview JPEG, \

  org.dspace.app.mediafilter.ImageMagickImageThumbnailFilter = ImageMagick Image Thumbnail, \

  org.dspace.app.mediafilter.ImageMagickPdfThumbnailFilter = ImageMagick PDF Thumbnail

#Configure each filter's input format(s)

filter.org.dspace.app.mediafilter.PDFFilter.inputFormats = Adobe PDF

filter.org.dspace.app.mediafilter.HTMLFilter.inputFormats = HTML, Text

filter.org.dspace.app.mediafilter.WordFilter.inputFormats = Microsoft Word

filter.org.dspace.app.mediafilter.PowerPointFilter.inputFormats = Microsoft Powerpoint, Microsoft Powerpoint XML

filter.org.dspace.app.mediafilter.JPEGFilter.inputFormats = BMP, GIF, JPEG, image/png, image/tiff, TIFF

filter.org.dspace.app.mediafilter.BrandedPreviewJPEGFilter.inputFormats = BMP, GIF, JPEG, image/png

filter.org.dspace.app.mediafilter.ImageMagickImageThumbnailFilter.inputFormats = BMP, GIF, image/png, JPG, TIFF, JPEG, JPEG 2000

filter.org.dspace.app.mediafilter.ImageMagickPdfThumbnailFilter.inputFormats = Adobe PDF

5) The error displaying when I run the filter-media command specifically for an handle with JPEG 2000 bitsream is as follows:

org.im4java.core.CommandException: org.im4java.core.CommandException: convert: no decode delegate for this image format `TMP' @ error/constitute.c/ReadImage/501.

org.im4java.core.CommandException: org.im4java.core.CommandException: convert: no decode delegate for this image format `TMP' @ error/constitute.c/ReadImage/501.

at org.im4java.core.ImageCommand.run(ImageCommand.java:219)

at org.dspace.app.mediafilter.ImageMagickThumbnailFilter.getThumbnailFile(ImageMagickThumbnailFilter.java:126)

at org.dspace.app.mediafilter.ImageMagickImageThumbnailFilter.getDestinationStream(ImageMagickImageThumbnailFilter.java:37)

at org.dspace.app.mediafilter.MediaFilterManager.processBitstream(MediaFilterManager.java:734)

at org.dspace.app.mediafilter.MediaFilterManager.filterBitstream(MediaFilterManager.java:550)

....

Am I missing some other step? Haven't found real documentation on this.

Thank you,

Pedro Amorim

[Gerard Suades]

Hi Pedro,

Just guessing, make sure you have the appropiate jpeg 2000 delegates (encoders) on your image magick installation as some of them might not be enabled/installed by default.

You can see the delegates list with this command.
$ convert -list configure

You can see a list of enabled decoders (r) / encoders (w) with this command.
$ convert -list format

Hope this helps,

--Gerard

El 19/10/16 a les 14:16, Pedro Amorim ha escrit:

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[Pedro Amorim]

Hello Gerard,

Thank you so much for your reply.

I actually made some progress after I first posted this question and it has directly to do with what you're referring.

1) You see, I installed imagemagick on my local workstation just for testing, and the convert -list configure:

DELEGATES     bzlib djvu fftw fontconfig freetype jbig jpeg jng jp2 lcms2 lqr lzma openexr pango png rsvg tiff x11 xml wmf zlib

Whereas running the same command on my DSpace server, after packages install, lists a different set of delegates where jp2 is missing.

After that, I manually tested the convert jp2 to jpeg. Worked fine in my workstation but failed in the DSpace.

The confusing part for me was the message convert: no decode delegate for this image format `TMP' but after a couple of tests, imagemagick uses the mimetype to check if it can work with it but it will print the file extension on error, because filter-media in DSpace creates .tmp images, the error message was not obvious at first.

2) Once I checked that jp2 wasn't available on DSpace server but it was on my workstation, it's time to look at imagemagick itself.

I'm running Ubuntu 14.04 on my workstation and it installs Imagemagick version 6.7.7

On the DSpace server running Debian Jessie 8, it installs Imagemagick 6.8.9 (I wasn't sucessfull when I tried downgrading it to 6.7.7 in debian jessie, seems only 6.8.9 is available)

From what I understand, each version has a different subset of available delegates.

3) So, I decided to uninstall Imagemagick from the DSpace server and install it from source following this guide http://www.imagemagick.org/script/install-source.php

After installing from source, the version is now 7.0.3 and there's only 2 delegates available mpeg x. I think source installs come with no delegates and they need to be added manually. Which is a pain. I haven't found an easy to install all delegates, or at least all common delegates. Because now, not only I need to figure out how to manually add jp2 delegate to source install but I also need to add every other delegate also need (png, tiff, etc).

I've hit a couple of dead-ends and right now I'm stumped.

Any suggestions?

Sorry for long text and thank you,

Pedro Amorim

[Pedro Amorim]

After a couple of days disconnected from this issue, today I came back to it determined to solve it.

Turns out the problem really is the imagemagick delegates and there's a bug in the Debian Jessie package install:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=773530

After going nowhere with source installs and going around in circles, I decided to point my package repositories to Debian Wheezy and install imagemagick from those packages. Voilá, the version installed is 6.7.7 and jp2 delegate comes with it. After running [dspace]bin/dspace filter-media -i (some-record-with-jp2-file-attached) it's working just fine.

Anyways, this is how I got around to it. If someone else got around this in a better way, please do share.

Thank you,

Pedro Amorim