The above is definitely correct. However, it's rather in convenient if you know what you want to see, but you don't know the exact time it's at in the file. I use the above method to make "thumbnail guesses". If they are good enough, I leave them. If they are not, I do:
1. I have a menu item under "send to > external" to open videos in VLC media player. I select the video, then select that item.
2. Navigate in VLC to find the shot I want to be the thumbnail.
3. In VLC select "snapshot". This saves it to a specific directory configured within VLC.
4. Go back to MC, select the video, right click > cover art > add from file.
5. Navigate to the just saved VLC snapshot (which is a JPG) and select it.
Now the shot I found in VLC is the thumbnail in MC. It's also the saved cover art (jpg), so it should never be lost or regenerated at a different spot in the video.
This is sort of "too long" to do on very many files, so I don't do it much. It would be really cool if we could do this from within MC itself, since it's a video player too. In fact, I think there is a Core Command that's supposed to do this: 10055 . But I can't get it to work. Maybe because I use the Mac version of MC?
Brian.