Dolphin not generating new mp4 thumbnails

At some point in the past month dolphin stopped producing new thumbnails. The existing thumbnails are displayed, but when I add a video file no thumbnail is produced. In Dolphin->Configure->Configure Dolphin->Interface->Previews the video/jpeg is selected.

Is anybody else experiencing this? Suggestions?

Possibly related to gstreamer-plugins-bad-wants-to-obsolete-gstreamer-plugin-openh264
You may lack ffmpeg-7 from Packman or something like that (not a Dolphin user here).

I did
zypper ar --refresh -p 70 http://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Slowroll/Essentials/ packman

and then

zypper dup --from packman --allow-vendor-change

It now works.

The thumbnailing may have been broken since I switched to slowroll. I had pressing personal issues that called me away from using my computer for several weeks just after changing. I only noticed the problem when I downloaded new videos.

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