Has anyone managed to produce thumbnails of mp4 files yet?

[Carolyn Sullivan]

Hello all,

Wondering if anyone has managed to produce thumbnails of mp4 files yet.  If so, how did you do it?  I have the most current versions of ImageMagick, Ghostscript and ffmpeg on my server (6.9.10-23, 9.50, and 4.2.7-0ubuntu0.1, respectively).  I'm running DSpace 7.6.2.  I added filter.plugins = ImageMagick Video Thumbnail  to my local.cfg.dev file.  However, running sudo -u tomcat /var/dspace/bin/dspace filter-media -i [collection handle] -v, it gives NO output for video files, not even an error... and for pdfs, it's telling me:

 org.im4java.core.CommandException: convert-im6.q16: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/413

which seems to be possibly a separate problem.

Anyone see this before or have any idea as to the cause?

Thanks,

Carolyn.

[Abel Gómez]

Hi Carolyn,

we have the "ImageMagick Video Thumbnail" succesfully working on our production server (https://hdl.handle.net/11705/SISTEDES/SEMINARIOS).

We're running Debian 12, and ImageMagick 6.9.11-60.

Regarding your problem with video Thumbnails, I think it's related to this issue discussed long ago: https://groups.google.com/g/dspace-tech/c/Pz5zGJjAS1w?pli=1

I think it's because you're using an old version of ImageMagick which expects that MP4 files are specified as "MPEG" rather than as "VIDEO" when explicitly setting the video file format (exactly, here: https://github.com/DSpace/DSpace/blob/2205bb18b1786b71d6cef876e67566d35c04bb49/dspace-api/src/main/java/org/dspace/app/mediafilter/ImageMagickVideoThumbnailFilter.java#L66). That's my guess from inspecting the code.

Here's the commit when the developers of ImageMagick introduced this breaking change (https://github.com/ImageMagick/ImageMagick6/commit/4872c693299802cfe6677742867098f64440d9aa). It was around version 6.9.11-31.

I have planned to send a PR to make that part of the code configurable, but didn't have the time.

Regarding your issue with PDF files, is a configuration issue of ImageMagick. See https://wiki.lyrasis.org/display/DSDOC7x/ImageMagick+Media+Filters#ImageMagickMediaFilters-%22convert.im6:notauthorized%22errors

Best regards,

Abel

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[C S]

Hello all,

Thanks Abel for the solution to the issue with the PDF files.  Unfortunately, the problem with the mp4 files persists.  It says the script is running, but the mp4 thumbnail is never produced, and no error is created.  I tried changing VIDEO to MPEG on line 66 of DSpace/dspace-api/src/main/java/org/dspace/app/mediafilter/ImageMagickVideoThumbnailFilter.java, and it made no difference.  I've doublechecked the configuration settings (https://wiki.lyrasis.org/display/DSDOC7x/ImageMagick+Media+Filters).  Nothing seems to work.  Does anyone have any other suggestions?  Abel, which version of DSpace are you running, if you don't mind me asking?

Thanks,

Carolyn.

To view this discussion visit https://groups.google.com/d/msgid/dspace-tech/01a8070d-884c-419b-8c45-4667a5db0427%40gmail.com.

[Abel Gómez]

Hello Carolyn,

to be fair, in the original discussion ( https://groups.google.com/g/dspace-tech/c/Pz5zGJjAS1w?pli=1) using MPEG instead of VIDEO also hitted another bug in ImageMagick and the filter still didn't work after changing that line (that other error was reported by the other user, but I didn't test anything).

In any case, it's weird that no errors are reported... Without logs, I cannot give you any more guidance.

Right now, I'm running DSpace 9.1, but we have the filter running with no issues since DSpace 7.5 (we've used 7.5, 7.6, 7.6.1, 8.0 and 9.1 so far).

We started using Debian 11, and as I said, now we run Debian 12.12 with the default repositories.

Which system are you running? Ubuntu 20.04? Can you test on a more modern system?

Best regards,

Abel