Hi,
I just installed a crisp and clean Rocky Linux 8.6 + KDE from EPEL, in replacement of OpenSUSE Tumbleweed which was too much of a moving target (and that’s putting it mildly).
In the past I’ve used Plasma on a variety of distributions, including CentOS, OpenSUSE, Debian, Slackware, KDE Neon, etc. Usually Dolphin displays thumbnails of videos using the ffmpegthumbnails package.
I’ve installed this package, but to no avail. Thumbnails aren’t available, and Dolphin options don’t show them. Either video thumbnail support hasn’t been built into Dolphin, or I’m missing something.
Any suggestions ?
Just out of curiosity, in the Dolphin settings somewhere, is there perhaps a filesize limit for thumbnails? I’ve had this under Cinnamon. Hence just wondering if Dolphin works the same.
Yes, there is a file size limit for remote files. But that’s not the problem here. Looks like the Dolphin package was built without video thumbnail support.
On a side note, a few years back I used Slackware with a minimal KDE built from source with a handful of custom build scripts, and I remember you had to explicitly enable video thumbnail support in the file manager.
Now what ? File a bug report / feature request ? On Red Hat’s EPEL bugzilla ? I remember last time I posted a request on the epel-devel mailing list, I only got the silent treatment.
Cheers,
Niki
Most likely yes, needs to be clarified by the package maintainer:
[root@rocky8 ~]# dnf info dolphin
Last metadata expiration check: 0:13:38 ago on Tue 18 Oct 2022 16:16:24 CEST.
Available Packages
Name : dolphin
Version : 21.08.3
Release : 1.el8
Architecture : x86_64
Size : 3.8 M
Source : dolphin-21.08.3-1.el8.src.rpm
Repository : epel
Summary : KDE File Manager
URL : https://invent.kde.org/system/dolphin
License : GPLv2+
Description : KDE File Manager.
as you can see it belongs to EPEL so it’s up to them to ensure they enable/disable the features that are required of it. It does happen though, I’ve seen Debian packages that haven’t had features enabled, and required using packages for example from Backports, or building yourself if you require certain functionality that isn’t included by default. Which isn’t great, and therefore ideal that the original package included, but means relying on them checking and applying it (however long that will take).
In theory it should also be possible to pull the src.rpm and modify that and recompile where necessary, but that’s not something I would do personally, one because I’m not a dev 
and two, I would have to maintain that somehow on an ongoing basis.