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Before I upgraded to Ubuntu 12.04, thumbnails on video files worked nicely, after the upgrade, thumbnails aren't generating on video files and only on video files, most of them are .mkv files. I have some .pdf files and they all have thumbnails. I have tried to clear the thumb cache, but no luck.

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Isn't there a setting for size as well? Maybe thumbnails aren't being shown for (very) large files? –  user25656 Aug 22 '12 at 17:56
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4 Answers

Please ensure that the necessary packages are installed by running the following command in the terminal:

sudo apt-get install gstreamer0.10-plugins-bad gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly totem libxine1-ffmpeg

Also, please delete the thumbnails that failed to load by running the following command:

rm ~/.thumbnails/fail/gnome-thumbnail-factory/*

In Ubuntu 13.10, the folder changes to: .cache/thumbnails, so you should delete those failed files instead:

rm ~/.cache/thumbnails/fail/gnome-thumbnail-factory/*
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Just getting these packages worked for me, without no need to delete any thumbnails. Thanks! –  ErickPetru Aug 22 '12 at 20:05
    
SUCCESS!!! Finally!! Thanks much. –  Joseph LaTendresse Aug 22 '12 at 22:27
    
I've done all this and I can't seem to get any thumbnail to show. Any, not just video. This happen after I deleted the .thumbnails folder, I see that they are being created inside that folder but nautilus is not showing them –  Felipe Sep 28 '12 at 18:20
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In 12.10 I have to install gstreamer0.10-ffmpeg to get it work with nautilus. –  Khurshid Alam Mar 11 '13 at 7:55
    
Is Totem install really necessary, @Sukarn ? –  diegoaguilar Oct 5 '13 at 23:38
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I followed the instructions in this forum and it worked perfectly.

Install libxine1-ffmpeg.
sudo apt-get install libxine1-ffmpeg

Then to force nautilus to generate new thumbnails execute
rm -r ~/.thumbnails/fail
rm -r ~/.thumbnails/normal
killall -9 nautilus

These commands will remove (delete) thumbnails from these folders.

Open nautilus again and you should be able to see thumbnails for all your videos.

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I had to re install my ubuntu to get the video thumbnails working again, it was annoying. I couldn't fin any other way.

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I installed ffmpegthumbnailer:

sudo apt-get install gstreamer0.10-plugins-bad gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly totem libxine1-ffmpeg

It works in 13.10

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