Comment 5 for bug 1505014

Thanks for the bug report.

(In reply to hkz85825915 from comment #0)
> Dolphin used to have ffmpegthumbnail and mplayerthumbnail

No, Dolphin never had them, nor did Dolphin ever have any thumbnailers, or Preview plugins, at all. All these plugins are provided by other packages, which are then used not only by Dolphin, but also by the file dialog, Folder View, and others, to generate thumbnails.

Maybe ffmpegthumbs and mplayerthumbs are not ported to Qt5/KF5 yet?