I have changed my Unity default file manager to Dolphin.
Problem: video thumbnails don't show up anymore.
In Nautilus the thumbnails are shown correctly.
How to make Dolphin show thumbnails?
4 Answers
Thumbnailer
To show thumbnails the Dolphin will need the thumbnail plug in.
Video thumbnailers for the Dolphin:
:~$ apt-cache show ffmpegthumbs
Package: ffmpegthumbs
Priority: optional
Section: universe/kde
...
Description: video thumbnail generator using ffmpeg FFMpegThumbs is a video thumbnail generator for KDE file managers like Dolphin and Konqueror. It enables them to show preview images of video files using FFMpeg. . This package is part of the KDE multimedia module.
Homepage: .
:~$ apt-cache show mplayerthumbs
Package: mplayerthumbs
Priority: optional
Section: universe/kde
...
Description: video thumbnail generator using mplayer MPlayerThumbs is a video thumbnail generator for KDE file managers like Dolphin and Konqueror. It enables them to show preview images of video files using MPlayer. . This package is part of the KDE multimedia module.
Homepage: .
:~$ apt-cache show kffmpegthumbnailer
Package: kffmpegthumbnailer
Priority: extra
Section: universe/kde
...
Description: video thumbnailer for KDE kffmpegthumbnailer is a video thumbnailer based on ffmpegthumbnailer. The thumbnailer uses ffmpeg to decode frames from the video files.
Homepage: Settings
To use the thumbnail you need to enable the thumbnailer from the Dolphin settings.
In a terminal run
sudo apt install ffmpegthumbs mplayerthumbs kffmpegthumbnailerthen... change in dolphin settings as says in user26687's answer... works for me kubuntu 14.04lts in laptop n4010 dell
1Now in Ubuntu 15.10 I needed another package for thumbnails to show:
sudo apt-get install kio-extras
- Install the following packages:
ffmpegthumbs mplayerthumbs kffmpegthumbnailer kio-extras - Restart Dolphin
- Settings > Configure Dolphin > General > Behavior > View > Use common properties for all folders, OK
- Press the "Preview" button
