As you can see in the picture below, only the H264 codec video shows up its thumbnail, not the HEVC or VP9 (mkv).
How do I see their thumbnails?
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This may not be exact solution but a temporary work-around. Working for
If you want to have preview/thumbnails, use
sudo apt-get install nautilus
Recommended reading: Is Nautilus really “not-recommended”?
sudo apt-get install totem ffmpegthumbnailer
Now the task is to keep only
/usr/share/thumbnailers/. For this, open terminal and run:
Click on File system --> usr --> share --> thumbnailers -->
Here keep ONLY
totem.thumbnailer, CUT remaining two and place in home folder (your choice).
Now clear cache:
rm -rf ~/.thumbnails mkdir ~/.thumbnails