The matroska specification allows one to attach an image file to your video 
(actually you can store whatever you want in it). In jaunty 
totem-video-thumbnailer used these in the video embedded images to generate a 
thumbnail for this movie and only generated a thumbnail from a video frame if 
there was no image file embedded. 
In the attached example matroska file (example.mkv) I added the Ubuntu Logo and 
therefore it is used as a thumbnail in Jaunty in karmic the image is ignored.
The nice thing is that you can store the film poster or the cover of the DVD in 
the movie and it is used as the thumbnail this makes the movies far more easy 
to recognise than an arbitrary frame of the movie. Another advantage is that 
thumbnail generation is much faster. 
Only few programs and devices support this behaviour therefore I found it 
really nice that the totem-video-thumbnailer supported it and converted my 
whole collection of movies into the matroska format and added the covers of the 
DVDs. 

You can check whether a matroska file has an image embedded by issuing
the following command mkvmerge -i <movie.mkv>

I hope I could explain what I would expect.

-- 
videos embedded pictures are no longer used as thumbnails
https://bugs.launchpad.net/bugs/437580
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