Hi DSpace community,

We have a partner library running DSpace 7.6.3 on a RedHat server.

Now the backend DSpace server has ImageMagick installed, and we are able to 
successfully manually test ImageMagick webp conversion.

However, when we manually run the filter-media script on an item the video 
thumbnail generation fails with  *org.im4java.core.CommandException: 
Unknown encoder 'webp' - *see below output:

*---*

[dspace]# bin/dspace filter-media -v -i '10292/19016'
The script has started
The following MediaFilters are enabled: 
Full Filter Name: org.dspace.app.mediafilter.ImageMagickVideoThumbnailFilter
org.dspace.app.mediafilter.ImageMagickVideoThumbnailFilter
PROCESSING: bitstream XXX (item: 10292/19016)
File: Black and Pink Minimalist Welcome To My Channel YouTube Video 
(1).mp4.jpg
IM Thumbnail Param: -auto-orient 
VIDEO:/tmp/imthumb8300761135230282362.tmp[100] -thumbnail 257x350 
/tmp/imthumb8300761135230282362.tmp.jpg 
ERROR filtering, skipping bitstream:
Item Handle: 10292/19016 Bundle Name: ORIGINAL File Size: 460491 Checksum: 
XXX (MD5) Asset Store: 0 Internal ID: XXX
org.im4java.core.CommandException: Unknown encoder 'webp'
Caused by: org.im4java.core.CommandException Unknown encoder 'webp'
The script has completed
[dspace]#

---

Has anyone else in the DSpace community encountered this error before and 
if so how did you approach fixing it?

Thanks,
Alex

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