How can I see the thumbnails of HEVC and mkv with VP9 encode videos?

Question

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?

youtube-dl -f bestvideo+bestaudio youtube.com/watch?v=rvk1-5VDcNU — JulianLai, Commented Dec 29, 2015 at 7:51
By the way, the youtube-dl has to be the latest version, the Ubuntu official version is way too old! — JulianLai, Commented Dec 29, 2015 at 8:27
Please drop at chat.stackexchange.com/rooms/33570/ravan-and-julianlai — Ravan, Commented Dec 29, 2015 at 8:52

Community · Accepted Answer · 2017-04-13 13:00:38Z

This may not be exact solution but a temporary work-around. Working for vp9

If you want to have preview/thumbnails, use nautilus.

sudo apt-get install nautilus

Install totem and ffmpegthumbnailer

sudo apt-get install totem ffmpegthumbnailer

Now the task is to keep only totem.thumbnailer in /usr/share/thumbnailers/. For this, open terminal and run:

sudo pantheon-files

Click on File system --> usr --> share --> thumbnailers -->

Here keep ONLY totem.thumbnailer, CUT remaining two and place in home folder (your choice).

Close files.

Now clear cache:

rm -rf ~/.thumbnails
mkdir ~/.thumbnails

Now launch nautilus

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