GNOME Files (Nautilus) defaults to Totem and GStreamer for video thumbnails. If thumbnails fail to generate or load slowly, switching to ffmpegthumbnailer is faster and handles uncommon video containers much better.
Note: If your videos are on a network drive, ensure Nautilus is set to show thumbnails for "All Files" in Preferences > Performance, otherwise it will skip remote files.
Codecs & Thumbnail Cache
First, install the necessary plugins to allow GStreamer to decode common formats like MP4 and MKV. After installing, you must clear the existing "fail" cache.
# 1. Install necessary codecs (Ubuntu/Debian)
sudo apt update
sudo apt install ffmpegthumbnailer gstreamer1.0-libav gstreamer1.0-plugins-ugly
# 2. Clear the thumbnail cache and restart Nautilus
rm -rf ~/.cache/thumbnails/*
nautilus -q
Switch to ffmpegthumbnailer
The default Totem thumbnailer can be slow. Switching to ffmpegthumbnailer provides faster generation and support for more obscure containers.
| Step | Action |
|---|---|
| Disable Totem | Rename /usr/share/thumbnailers/totem.thumbnailer to .bak |
| Create Config | Create /usr/share/thumbnailers/ffmpegthumbnailer.thumbnailer |
| MIME Types | Add video/mp4, video/x-matroska, video/webm, etc. |
Paste the following configuration into your new .thumbnailer file:
[Thumbnailer Entry]
TryExec=ffmpegthumbnailer
Exec=ffmpegthumbnailer -i %i -o %o -s %s -f
MimeType=video/3gpp;video/3gpp2;video/dv;video/isivideo;video/mj2;video/mp2t;video/mp4;video/mpeg;video/ogg;video/quicktime;video/vnd.mpegurl;video/vnd.rn-realvideo;video/vnd.vivo;video/wavelet;video/webm;video/x-anim;video/x-flic;video/x-flv;video/x-javafx;video/x-matroska;video/x-mjpeg;video/x-mng;video/x-msvideo;video/x-ms-wmv;video/x-nsv;video/x-ogm+ogg;video/x-sgi-movie;video/x-theora+ogg;video/x-matroska-3d;video/vnd.avi;
Troubleshooting
Still No Thumbnails?
Nautilus has a file size limit for thumbnailing to prevent system lag on massive files.
The Fix: Go to Files > Preferences > Performance and increase the "Only for files smaller than" value to 4GB or higher.
Manual Cache Reset Command:
# If individual files won't update, force a global refresh:
rm -rf ~/.cache/thumbnails/fail/*
rm -rf ~/.cache/thumbnails/large/*
rm -rf ~/.cache/thumbnails/normal/*
killall nautilus