Sometimes nautilus will try to generate a thumbnail for a video file while it’s downloading. Then nautilus remembers that it tried, and failed, to generate a thumbnail for that file. Once the file has finished downloading, the thumbnail remains broken. I’ve had this issue for a while, today I chose to find a solution.
Download this file and put it into your ~/.gnome2/nautilus-scripts directory. The script is by Barak, I uploaded a plain text version here to make it easier to download. Make the script executable, you can run
chmod +x ~/.gnome2/nautilus-scripts/delete_thumbnails.py in a terminal to do this. Now go to that directory in Nautilus, and you’re in business.
To test, right click on a file with a thumbnail. You should see a new menu, Scripts, under which you’ll see “delete_thumbnails.py”. Click that option and the thumbnail will be deleted. Press F5 to reload the folder in nautilus, and you should see a new thumbnail generated.
Thanks for a such a handy script Barak.